Slide 1: Investor Relations Supplemental Schedules Summary
EXHIBIT 99.3 Investor Relations Supplemental Schedules Investor Relations Supplemental Schedules Summary ($ Millions) 3Q 2008 3Q 2007 Reported Net Income $2,271 $1,324 EPS - Diluted $2.78 $1.58 Core Results $2,272 $1,210 EPS - Diluted $2.78 $1.45 Total Worldwide Production (mboe/day) 588 570 Total W
Slide 2: 2008 Third Quarter Net Income
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM 2008 Third Quarter Net Income (Loss) ($ millions) Reported Core Income Significant Items Affecting Income Results Oil & Gas $ 3,618 $ 3,618 Chemical 219 219 Midstream, marketing and other 66 66 Corporate Interest expense, net (3) (3) Oth
Slide 3: 2007 Third Quarter Net Income
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM 2007 Third Quarter Net Income (Loss) ($ millions) Reported Core Income Significant Items Affecting Income Results Oil & Gas $ 1,955 $ (12) Sale of oil & gas interests $ 1,914 74 Exploration impairments (103) Sale of exploration propertie
Slide 4: 2008 First Nine Months Net Income
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM 2008 First Nine Months Net Income (Loss) ($ millions) Reported Core Income Significant Items Affecting Income Results Oil & Gas $ 10,312 $ 10,312 Chemical 542 542 Midstream, marketing and other 350 350 Corporate Interest expense, net (10
Slide 5: 2007 First Nine Months Net Income
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM 2007 First Nine Months Net Income (Loss) ($ millions) Reported Core Income Significant Items Affecting Income Results Oil & Gas $ 5,496 $ (412) Sale of Russian operations $ 4,908 (112) Legal settlements (35) Sale of oil & gas interests 7
Slide 6: Items Affecting Comparability of Core Results Between Periods
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM Items Affecting Comparability of Core Results Between Periods The item(s) below are included in core results and are shown in this table because they affect the comparability between periods. Pre-tax Income / (Expense) Third Quarter Nine
Slide 7: Worldwide Effective Tax Rate
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM Worldwide Effective Tax Rate QUARTERLY YEAR TO-DATE 2008 2008 2007 2008 2007 REPORTED INCOME QTR 3 QTR 2 QTR 3 9 Months 9 Months Oil & Gas (a) 3,618 3,806 1,955 10,312 5,496 Chemicals 219 144 212 542 507 Midstream, marketing and other 66
Slide 8: 2008 Third Quarter vs Second Quarter Income Comparison
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM 2008 Third Quarter Net Income (Loss) Reported Income Comparison Third Second Quarter Quarter 2008 2008 B / (W) Oil & Gas $ 3,618 $ 3,806 $ (188) Chemical 219 144 75 Midstream, marketing and other 66 161 (95) Corporate Interest expense, n
Slide 9: Oil & Gas and Chemical Variance Analysis 3Q08 vs. 2Q08
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM Oil & Gas Variance Analysis 3Q08 vs. 2Q08 ($ Millions) *DD&A rate increase and higher operating expenses OCCIDENTAL PETROLEUM Chemical Variance Analysis 3Q08 vs. 2Q08 ($ Millions) *Higher feedstock costs 9
Slide 10: 2008 Third Quarter vs 2007 Income Comparison
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM 2008 Third Quarter Net Income (Loss) Reported Income Comparison Third Third Quarter Quarter 2008 2007 B / (W) Oil & Gas $ 3,618 $ 1,955 $ 1,663 Chemical 219 212 7 Midstream, marketing and other 66 86 (20) Corporate Interest expense, net
Slide 11: Oil & Gas and Chemical Variance Analysis 3Q08 vs. 3Q07
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM Oil & Gas Variance Analysis 3Q08 vs. 3Q07 ($ Millions) * DD&A rate increase and higher operating expenses OCCIDENTAL PETROLEUM Chemical Variance Analysis 3Q08 vs. 3Q07 ($ Millions)
Slide 12: Higher energy and feedstock costs
* Higher energy and feedstock costs 11
Slide 13: Summary of Operating Statistics: Net Production per Day
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM SUMMARY OF OPERATING STATISTICS Third Quarter Nine Months 2008 2007 2008 2007 NET PRODUCTION PER DAY: United States Crude Oil and Liquids (MBL) California 87 90 86 89 Permian 166 171 168 167 Midcontinent and Rockies 8 4 6 3 Total 261 265
Slide 14: Summary of Operating Statistics: Prices and Exploration Expense
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM SUMMARY OF OPERATING STATISTICS Third Quarter Nine Months 2008 2007 2008 2007 OIL & GAS: PRICES United States Crude Oil ($/BBL) 109.50 68.83 104.82 59.71 Natural gas ($/MCF) 9.35 5.90 9.18 6.45 Latin America Crude Oil ($/BBL) 77.76 60.77
Slide 15: Summary of Operating Statistics: Capital Expenditures and DD&A
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM SUMMARY OF OPERATING STATISTICS Third Quarter Nine Months Capital Expenditures ($MM) 2008 2007 2008 2007 Oil & Gas California $ 231 $ 157 $ 596 $ 432 Permian 131 85 331 338 Midcontinent and Rockies 109 43 243 143 Latin America 236 136 62
Slide 16: Corporate Capitalization
Investor Relations Supplemental Schedules OCCIDENTAL PETROLEUM CORPORATE ($ millions) 30-Sep-08 31-Dec-07 CAPITALIZATION Long-Term Debt (including current maturities) $ 1,771 $ 1,776 Notes Payable — 12 Others 25 25 Total Debt $ 1,796 $ 1,813 EQUITY $ 26,937 $ 22,823 Total Debt To Total Capitalizatio
Slide 17: Cash Flow Available For Capital and Other Uses
Investor Relations Supplemental Schedules Cash Flow Available For Capital and Other Uses (Millions, unless noted otherwise) 9 Months 12 Months Sept. 30 2008 2007 2006 2005 2004 Cash Flow From Continuing Operations $ 8,103 $ 6,660 $ 5,931 $ 4,740 $ 3,282 Dividends as paid (677) (765) (646) (483) (424