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, 2018	$ 36,586	$ 13,132	$ (4,006)	$ 31,658	$ (4,622)	$ 424
Net loss	(10,450)			(10,470)		20
Currency translation adjustments	14				18	(4)
Changes in fair value of cash flow hedges	(24)				(24)
Pension and other postretirement benefit plans	59				59
Shares sold to optionees, less shares exchanged	23	(26)	49
Vesting of restricted stock		(146)	146
Shares issued under employee stock purchase plan	196	(249)	445
Stock repurchase program	(278)		(278)
Stock-based compensation expense	329	329
Dividends declared	(2,077)			(2,077)
Other	(51)	(28)	3			(26)
Balance at Sep. 30, 2019	24,327	13,012	(3,641)	19,111	(4,569)	414
Balance at Jun. 30, 2019	36,273	13,037	(3,827)	31,186	(4,544)	421
Net loss	(11,373)			(11,383)		10
Currency translation adjustments	(25)				(21)	(4)
Changes in fair value of cash flow hedges	(24)				(24)
Pension and other postretirement benefit plans	20				20
Shares sold to optionees, less shares exchanged		(20)	20
Vesting of restricted stock	111	(134)	245
Stock repurchase program	(79)		(79)
Stock-based compensation expense	135	135
Dividends declared	(692)			(692)
Other	(19)	(6)				(13)
Balance at Sep. 30, 2019	24,327	13,012	(3,641)	19,111	(4,569)	414
Balance at Dec. 31, 2019	$ 24,176	$ 13,078	$ (3,631)	18,751	(4,438)	416
Balance, shares at Dec. 31, 2019	1,385	1,434
Treasury shares, Balance at Dec. 31, 2019			(49)
Net loss	$ (10,868)			(10,892)		24
Currency translation adjustments	(198)				(200)	2
Changes in fair value of cash flow hedges	(183)				(183)
Pension and other postretirement benefit plans	$ 78				78
Vesting of restricted stock		$ (152)	$ 152
Vesting of restricted stock, shares	2		2
Shares issued under employee stock purchase plan	$ 146	(298)	$ 444
Shares issued under employee stock purchase plan, shares	6		6
Stock repurchase program	$ (26)		$ (26)
Stock repurchase program, shares	(1)		(1)
Stock-based compensation expense	$ 318	318
Dividends declared	(1,041)			(1,041)
Other	(33)	(25)	$ 6			(14)
Balance at Sep. 30, 2020	$ 12,369	$ 12,921	$ (3,055)	6,818	(4,743)	428
Balance, shares at Sep. 30, 2020	1,392	1,434
Treasury shares, Balance at Sep. 30, 2020			(42)
Balance at Jun. 30, 2020	$ 12,456	$ 13,044	$ (3,339)	7,073	(4,738)	416
Net loss	(73)			(82)		9
Currency translation adjustments	(90)				(94)	4
Changes in fair value of cash flow hedges	43				43
Pension and other postretirement benefit plans	46				46
Vesting of restricted stock		(21)	21
Shares issued under employee stock purchase plan	61	(203)	264
Stock-based compensation expense	105	105
Dividends declared	(173)			(173)
Other	(6)	(4)	(1)			(1)
Balance at Sep. 30, 2020	$ 12,369	$ 12,921	$ (3,055)	$ 6,818	$ (4,743)	$ 428
Balance, shares at Sep. 30, 2020	1,392	1,434
Treasury shares, Balance at Sep. 30, 2020			(42)