CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities:
Net income (loss)	$ (1,547)	$ 594
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	113	112
Amortization of debt issuance costs	1	1
Impairments	1,479	0
Deferred income taxes	408	(426)
(Gain) loss on derivatives, unsettled	(246)	22
Stock-based compensation	1	2
Gain on early extinguishment of debt	(28)	0
Other	0	1
Change in assets and liabilities:
Accounts receivable	53	189
Accounts payable	(86)	(48)
Taxes payable	(6)	4
Interest payable	1	2
Inventories	8	5
Other assets and liabilities	9	(16)
Net cash provided by operating activities	160	442
Cash Flows From Investing Activities:
Capital investments	(228)	(258)
Net cash used in investing activities	(228)	(258)
Cash Flows From Financing Activities:
Payments on long-term debt	(52)	0
Payments on revolving credit facility	(500)	0
Borrowings under revolving credit facility	615	0
Change in bank drafts outstanding	5	3
Purchase of treasury stock	0	(21)
Cash paid for tax withholding	0	(1)
Net cash provided by (used in) financing activities	68	(19)
Increase in cash and cash equivalents	0	165
Cash and cash equivalents at beginning of year	5	201
Cash and cash equivalents at end of period	$ 5	$ 366