Basis of Presentation - Balance Sheet Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounts Receivable, Net
Commodity Sales	$ 308	$ 446
Joint Interest Billings	136	164
Other	125	128
Current Expected Credit Losses	(7)	(8)
Total	562	730
Other Current Assets
Commodity Derivative Assets	221	14
Inventories, Materials and Supplies	68	59
Assets Held for Sale	1	14
Prepaid Expenses and Other Current Assets	63	61
Total	353	148
Other Noncurrent Assets
Equity Method Investments	1,249	1,066
Operating Lease Right of Use Assets	244	227
Customer-Related Intangible Assets, Net	270	278
Goodwill	0	110
Other Assets, Noncurrent	162	153
Total	1,925	1,834
Other Current Liabilities
Production and Ad Valorem Taxes	113	118
Asset Retirement Obligations	84	84
Interest Payable	80	74
Operating Lease Liabilities	95	88
Compensation and Benefits Payable	25	126
Other Liabilities, Current	254	229
Total	651	719
Other Noncurrent Liabilities
Deferred Compensation Liabilities	112	133
Asset Retirement Obligations	709	730
Operating Lease Liabilities	172	164
Firm Transportation Exit Cost Accrual	114	129
Other Liabilities, Noncurrent	199	222
Total	$ 1,306	1,378
Lease renewal term	5 years
Lease renewal	$ 28
Accumulated amortization	$ 70	$ 62