Consolidated Statements of Cash Flows - USD ($) shares in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income		$ 315,000,000	$ 945,000,000	$ 517,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes		47,000,000	168,000,000	(20,000,000)
Impairment of oil and natural gas properties		790,000,000	0	0
Asset retirement obligation accretion		7,000,000	2,000,000	1,000,000
Depreciation, depletion and amortization		1,447,000,000	623,000,000	327,000,000
Amortization of debt issuance costs		9,000,000	12,000,000	4,000,000
Loss on early extinguishment of debt		56,000,000	0	0
Change in fair value of derivative instruments		188,000,000	(222,000,000)	84,000,000
Loss (income) from equity investment		6,000,000	0	(1,000,000)
(Gain) loss on revaluation of investment		(5,000,000)	1,000,000	0
Equity-based compensation expense		48,000,000	27,000,000	26,000,000
(Gain) loss on sale of assets, net		(1,000,000)	3,000,000	(1,000,000)
Gain on sale of inventory		(1,000,000)	0	0
Restricted cash		(5,000,000)	0	0
Changes in operating assets and liabilities:
Accounts receivable		(187,000,000)	13,000,000	(97,000,000)
Inventories		(10,000,000)	(14,000,000)	(2,000,000)
Prepaid expenses and other		29,000,000	25,000,000	(11,000,000)
Accounts payable and accrued liabilities		(129,000,000)	(7,000,000)	37,000,000
Income tax payable		0	(1,000,000)	1,000,000
Accrued interest		(5,000,000)	(22,000,000)	(21,000,000)
Revenues and royalties payable		135,000,000	12,000,000	45,000,000
Net cash provided by operating activities		2,734,000,000	1,565,000,000	889,000,000
Cash flows from investing activities:
Drilling, completions and non-operated additions to oil and natural gas properties		(2,557,000,000)	(1,359,000,000)	(737,000,000)
Infrastructure additions to oil and natural gas properties		(120,000,000)	(102,000,000)	(56,000,000)
Additions to midstream assets		(244,000,000)	(204,000,000)	(68,000,000)
Purchase of other property, equipment and land		(5,000,000)	(7,000,000)	(23,000,000)
Acquisition of leasehold interests		(443,000,000)	(1,371,000,000)	(1,961,000,000)
Acquisition of mineral interests		(333,000,000)	(440,000,000)	(407,000,000)
Acquisition of midstream assets		0	0	(50,000,000)
Proceeds from sale of assets		300,000,000	80,000,000	66,000,000
Investment in real estate		(1,000,000)	(111,000,000)	0
Funds held in escrow		0	11,000,000	104,000,000
Equity investments		(485,000,000)	0	0
Net cash used in investing activities		(3,888,000,000)	(3,503,000,000)	(3,132,000,000)
Cash flows from financing activities:
Proceeds from borrowings under credit facility		2,350,000,000	2,652,000,000	754,000,000
Repayment under credit facility		(3,718,000,000)	(1,242,000,000)	(384,000,000)
Repayment on Energen's credit facility		0	(559,000,000)	0
Proceeds from senior notes		3,469,000,000	1,062,000,000	0
Repayment of senior notes		(1,250,000,000)	0	0
Proceeds from joint venture		39,000,000	0	0
Premium on extinguishment of debt		(44,000,000)	0	0
Debt issuance costs		(18,000,000)	(25,000,000)	(9,000,000)
Public offering costs		(41,000,000)	(3,000,000)	(1,000,000)
Proceeds from public offerings		1,106,000,000	305,000,000	370,000,000
Proceeds from exercise of stock options		9,000,000	0	0
Repurchased shares for tax withholdings		(13,000,000)	(14,000,000)	0
Repurchased as part of share buyback		(593,000,000)	0	0
Dividends to stockholders		(112,000,000)	(37,000,000)	0
Distributions to non-controlling interest		(122,000,000)	(98,000,000)	(41,000,000)
Net cash (used in) provided by financing activities		1,062,000,000	2,041,000,000	689,000,000
Net increase (decrease) in cash and cash equivalents		(92,000,000)	103,000,000	(1,554,000,000)
Cash and cash equivalents at beginning of period		215,000,000	112,000,000	1,666,000,000
Cash and cash equivalents at end of period		123,000,000	215,000,000	112,000,000
Supplemental disclosure of cash flow information:
Interest paid, net of capitalized interest		237,000,000	114,000,000	58,000,000
Cash paid for income taxes		0	1,000,000	0
Supplemental disclosure of non-cash transactions:
Change in accrued capital expenditures		(20,000,000)	274,000,000	161,000,000
Capitalized stock-based compensation		$ 17,000,000	$ 10,000,000	$ 9,000,000
Common stock issued	[1]	0	7,136	0
Asset retirement obligations acquired		$ 4,000,000	$ 111,000,000	$ 2,000,000
Ajax Acquisition
Supplemental disclosure of non-cash transactions:
Common stock issued		0	340	0
Brigham
Supplemental disclosure of non-cash transactions:
Common stock issued		0	0	809

[1] Includes $7 billion of Common stock issued for business combination, $14 million for stock options assumed and $52 million for restricted stock units assumed.