CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total	Capital Stock	Capital in Excess of Par Value of Stock [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Parent [Member]	Equity (Deficit) Attributable to Non-controlling Interests [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.65
Total equity/(deficit) at Dec. 31, 2016	$ 29,746	$ 41	$ 21,630	$ 16,193	$ (7,013)	$ (1,122)	$ 29,729	$ 17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(7,757)	0	0	(7,731)	0	0	(7,731)	(26)
Other comprehensive income/(loss), net of tax	(52)	0	0	0	(54)	0	(54)	2
Common stock issued (including share-based compensation impacts)	(207)	0	(207)	0	0	0	(207)	0
Treasury stock/other	(133)	0	0	0	0	(131)	(131)	(2)
Cash dividends declared (a)	(2,595)	0	0	(2,584)	0	0	(2,584)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	11
Total equity/(deficit) at Dec. 31, 2017	$ 35,606	41	21,843	21,906	(6,959)	(1,253)	35,578	28
Common Stock, Dividends, Per Share, Declared	$ 0.73
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ (3,695)	0	0	(3,677)	0	0	(3,677)	(18)
Other comprehensive income/(loss), net of tax	407	0	0	0	407	0	407	0
Common stock issued (including share-based compensation impacts)	(163)	0	(163)	0	0	0	(163)	0
Treasury stock/other	(164)	0	0	0	0	(164)	(164)	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	12
Dividends	(2,927)	0	0	(2,915)	0	0	(2,915)
Total equity/(deficit) at Dec. 31, 2018	$ 35,966	41	22,006	22,668	(7,366)	(1,417)	35,932	34
Common Stock, Dividends, Per Share, Declared	$ 0.60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ (84)	0	0	(47)	0	0	(47)	(37)
Other comprehensive income/(loss), net of tax	362	0	0	0	362	0	362	0
Common stock issued (including share-based compensation impacts)	(159)	0	(159)	0	0	0	(159)	0
Treasury stock/other	(222)	0	0	0	0	(196)	(196)	(26)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Dividends	(2,408)	0	0	(2,408)	0	0	(2,408)
Total equity/(deficit) at Dec. 31, 2019	$ 33,230	$ 41	$ 22,165	$ 20,320	$ (7,728)	$ (1,613)	$ 33,185	$ 45