| Operating revenues and other | — | — | — |
| Crude oil and condensate | 13,921a | 13,748a | 16,367a |
| Natural gas liquids | 2,106a | 1,884a | 2,648a |
| Natural gas | 1,551a | 1,744a | 3,781a |
| Gains (losses) on mark-to-market financial commodity and other derivative contracts, net | 204a | 818a | -3,982a |
| Gathering, processing and marketing | 5,800a | 5,806a | 6,696a |
| Gains on asset dispositions, net | 16a | 95a | 74a |
| Other, net | 100a | 91a | 118a |
| Total | 23,698a | 24,186a | 25,702a |
| Operating expenses | — | — | — |
| Lease and well | -1,572a | -1,454a | -1,331a |
| Gathering, processing and transportation costs | -1,722a | -1,620a | -1,587a |
| Exploration costs | -174a | -181a | -159a |
| Dry hole costs | -14a | -1a | -45a |
| Impairments | -391a | -202a | -382a |
| Marketing costs | -5,717a | -5,709a | -6,535a |
| Depreciation, depletion and amortization | -4,108a | -3,492a | -3,542a |
| General and administrative | -669a | -640a | -570a |
| Taxes other than income | -1,249a | -1,284a | -1,585a |
| Total | -15,616a | -14,583a | -15,736a |
| Operating income | 8,082a | 9,603a | 9,966a |
| Other income, net | 274a | 234a | 114a |
| Income before interest expense and income taxes | 8,356a | 9,837a | 10,080a |
| Interest expense | — | — | — |
| Incurred | -183a | -181a | -215a |
| Capitalized | -45a | -33a | -36a |
| Interest expense, net | -138a | -148a | -179a |
| Income before income taxes | 8,218a | 9,689a | 9,901a |
| Income tax provision | -1,815a | -2,095a | -2,142a |
| Net income | 6,403a | 7,594a | 7,759a |