Statements Of Unaudited Condensed Consolidated Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES
Net income (loss)	$ (42)	$ 814
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation, depletion and amortization	242	301
Impairment of long-lived assets	0	29
Deferred income taxes	(4)	57
Pension and OPEB credits	(40)	(27)
Loss on extinguishment of debt	0	14
Other	39	25
Changes in operating assets and liabilities:
Accounts receivable, net	(257)	(512)
Inventories	207	(372)
Income taxes	15	180
Pension and OPEB payments and contributions	(30)	(60)
Payables, accrued employment and accrued expenses	(90)	109
Other, net	(79)	(25)
Net cash provided (used) by operating activities	(39)	533
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(188)	(236)
Other investing activities	3	1
Net cash used by investing activities	(185)	(235)
FINANCING ACTIVITIES
Repurchase of common shares	0	(19)
Repayments of debt	0	(360)
Borrowings under credit facilities	1,646	1,715
Repayments under credit facilities	(1,339)	(1,609)
Other financing activities	(50)	(38)
Net cash provided (used) by financing activities	257	(311)
Net increase (decrease) in cash and cash equivalents	33	(13)
Cash and cash equivalents at beginning of period	26	48
Cash and cash equivalents at end of period	$ 59	$ 35