CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues and Other
Sales revenues	$ 3,338	$ 3,236
Gains (losses) on divestitures and other, net	92	19
Total	3,218	3,045
Costs and Expenses
Oil and gas operating	289	276
Oil and gas transportation	222	196
Exploration	49	168
General and administrative	267	278
Depreciation, depletion, and amortization	1,081	990
Production, property, and other taxes	199	190
Impairments	0	19
Other operating expense	21	140
Total	2,384	2,494
Operating Income (Loss)	834	551
Other (Income) Expense
Interest expense	253	228
(Gains) losses on derivatives, net	315	36
Other (income) expense, net	6	(12)
Total	572	251
Income (Loss) Before Income Taxes	262	300
Income tax expense (benefit)	166	126
Net Income (Loss)	96	174
Net income (loss) attributable to noncontrolling interests	111	53
Net Income (Loss) Attributable to Common Stockholders	$ (15)	$ 121
Per Common Share
Net income (loss) attributable to common stockholders—basic (in usd per share)	$ (0.03)	$ 0.23
Net income (loss) attributable to common stockholders—diluted (in usd per share)	$ (0.03)	$ 0.22
Average Number of Common Shares Outstanding—Basic (in shares)	490	518
Average Number of Common Shares Outstanding—Diluted (in shares)	490	519
Commodity Contract and Interest Rate Swap [Member]
Other (Income) Expense
(Gains) losses on derivatives, net	$ 313	$ 35
Oil sales [Member]
Revenues and Other
Sales revenues	2,096	2,127
Natural gas sales [Member]
Revenues and Other
Sales revenues	320	247
Natural-gas liquids sales [Member]
Revenues and Other
Sales revenues	240	292
Gathering, processing, and marketing sales [Member]
Revenues and Other
Sales revenues	470	360
Costs and Expenses
Gathering, processing, and marketing	$ 256	$ 237