CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock Issued	Common Stock In Treasury	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2019	$ 24,176	$ 13,078	$ (3,631)	$ 18,751	$ (4,438)	$ 416
Net income (loss)	(10,796)			(10,810)		14
Currency translation adjustments	(108)				(106)	(2)
Changes in fair value of cash flow hedges	(226)				(226)
Pension and other postretirement benefit plans	32				32
Vesting of restricted stock		(131)	131
Shares issued under employee stock purchase plan	85	(95)	180
Stock repurchase program	(26)		(26)
Stock-based compensation expense	213	213
Dividends declared	(868)			(868)
Other	(26)	(21)	7			(12)
Balance at Jun. 30, 2020	12,456	13,044	(3,339)	7,073	(4,738)	416
Balance at Mar. 31, 2020	15,983	12,963	(3,360)	10,681	(4,723)	422
Net income (loss)	(3,428)			(3,434)		6
Currency translation adjustments	20				19	1
Changes in fair value of cash flow hedges	(24)				(24)
Pension and other postretirement benefit plans	(10)				(10)
Vesting of restricted stock		(14)	14
Stock-based compensation expense	105	105
Dividends declared	(174)			(174)
Other	(16)	(10)	7			(13)
Balance at Jun. 30, 2020	12,456	13,044	(3,339)	7,073	(4,738)	416
Balance at Dec. 31, 2020	$ 12,489	$ 12,970	$ (3,033)	7,018	(4,884)	418
Balance, shares at Dec. 31, 2020	1,392	1,434
Treasury shares, Balance at Dec. 31, 2020			(42)
Net income (loss)	$ 755			730		25
Currency translation adjustments	(26)				(24)	(2)
Changes in fair value of cash flow hedges	17				17
Pension and other postretirement benefit plans	$ 119				119
Vesting of restricted stock		$ (174)	$ 174
Vesting of restricted stock, shares	2		2
Shares issued under employee stock purchase plan	$ 62	(202)	$ 264
Shares issued under employee stock purchase plan, shares	4		4
Stock-based compensation expense	$ 156	156
Dividends declared	(349)			(349)
Deconsolidation of subsidiary	(123)					(123)
Other	(41)	(20)	$ 4		(4)	(21)
Balance at Jun. 30, 2021	$ 13,059	$ 12,730	$ (2,591)	7,399	(4,776)	297
Balance, shares at Jun. 30, 2021	1,398	1,434
Treasury shares, Balance at Jun. 30, 2021			(36)
Balance at Mar. 31, 2021	$ 12,972	$ 12,663	$ (2,598)	7,142	(4,664)	429
Net income (loss)	443			431		12
Currency translation adjustments	(38)				(38)
Changes in fair value of cash flow hedges	(131)				(131)
Pension and other postretirement benefit plans	61				61
Vesting of restricted stock		(3)	3
Stock-based compensation expense	72	72
Dividends declared	(174)			(174)
Deconsolidation of subsidiary	(123)					(123)
Other	(23)	(2)	4		(4)	(21)
Balance at Jun. 30, 2021	$ 13,059	$ 12,730	$ (2,591)	$ 7,399	$ (4,776)	$ 297
Balance, shares at Jun. 30, 2021	1,398	1,434
Treasury shares, Balance at Jun. 30, 2021			(36)