Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (2,942)	$ (1,129)	$ 1,657
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Impairments and other charges	3,799	2,506	265
Cash impact of impairments and other charges - severance payments	(350)	(144)	0
Depreciation, depletion and amortization	1,058	1,625	1,606
Deferred income tax provision (benefit), continuing operations	(444)	(396)	(267)
Changes in assets and liabilities:
Receivables	1,394	636	(186)
Accounts payable	(934)	(595)	483
Inventories	340	(202)	(681)
Other operating activities	120	182	349
Total cash flows provided by operating activities	1,881	2,445	3,157
Cash flows from investing activities:
Capital expenditures	(728)	(1,530)	(2,026)
Proceeds from sales of property, plant and equipment	286	190	218
Payments to acquire businesses, net of cash acquired	0	0	(187)
Other investing activities	(44)	(105)	2
Total cash flows used in investing activities	(486)	(1,445)	(1,993)
Cash flows from financing activities:
Dividends to shareholders	(278)	(630)	(630)
Proceeds from issuance of common stock	87	118	195
Stock repurchase program	(100)	(100)	(400)
Payments on long-term borrowings	(1,654)	(13)	(445)
Other financing activities	(56)	(70)	(139)
Total cash flows used in financing activities	(1,007)	(695)	(1,419)
Effect of exchange rate changes on cash	(93)	(45)	(74)
Cash and equivalents at beginning of year	2,268	2,008	2,337
Cash and equivalents at end of year	2,563	2,268	2,008
Cash payments (receipts) during the period for:
Interest	509	534	556
Income taxes	300	363	178
Increase (Decrease) in Employee Related Liabilities	(160)	(38)	(69)
Proceeds from Issuance of Long-term Debt	994	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	$ 295	$ 260	$ (329)