CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Capital Stock	Capital in Excess of Par Value of Stock [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Retained Earnings/(Accumulated Deficit) [Member] Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Parent [Member]	Parent [Member] Cumulative Effect, Period of Adoption, Adjustment	Equity (Deficit) Attributable to Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2018	$ 35,966		$ 41	$ 22,006	$ 22,668		$ (7,366)	$ (1,417)	$ 35,932		$ 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income/(loss)	84		0	0	47		0	0	47		37
Other Comprehensive Income (Loss), Net of Tax	(362)		0	0	0		(362)	0	(362)		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	159		0	159	0		0	0	159		0
Treasury stock/other	(222)		0	0	0		0	(196)	(196)		(26)
Dividend and dividend equivalents declared (b)	(2,408)		0	0	(2,408)		0	0	(2,408)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Ending balance at Dec. 31, 2019	$ 33,230		41	22,165	20,320		(7,728)	(1,613)	33,185		45
Ending balance (Accounting Standards Update 2016-02) at Dec. 31, 2019		$ 13				$ 13				$ 13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.60
Net income/(loss)	$ (1,276)		0	0	(1,279)		0	0	(1,279)		3
Other Comprehensive Income (Loss), Net of Tax	(567)		0	0	0		(566)	0	(566)		(1)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	125		0	125	0		0	0	125		0
Treasury stock/other	109		0	0	0		0	23	23		86
Dividend and dividend equivalents declared (b)	(608)		0	0	(596)		0	0	(596)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(12)
Ending balance at Dec. 31, 2020	$ 30,811		41	22,290	18,243		(8,294)	(1,590)	30,690		121
Ending balance (Accounting Standards Update 2016-02) at Dec. 31, 2020		$ (202)				$ (202)				$ (202)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.15
Net income/(loss)	$ 17,910		0	0	17,937		0	0	17,937		(27)
Other Comprehensive Income (Loss), Net of Tax	(41)		0	0	0		(45)	0	(45)		4
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	321		0	321	0		0	0	321		0
Treasury stock/other	32		0	0	0		0	27	27		5
Dividend and dividend equivalents declared (b)	(411)		0	0	(411)		0	0	(411)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Ending balance at Dec. 31, 2021	$ 48,622		$ 41	$ 22,611	$ 35,769		$ (8,339)	$ (1,563)	$ 48,519		$ 103
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.10