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, 2017	$ 37,261	$ 12,975	$ (4,049)	$ 32,190	$ (4,274)	$ 419
Net income (loss)	1,628			1,599		29
Currency translation adjustments	(132)				(128)	(4)
Changes in unrealized gain on marketable securities	(33)				(33)
Changes in fair value of cash flow hedges	(8)				(8)
Pension and other postretirement benefit plans	130				130
Shares sold to optionees, less shares exchanged	29	(37)	66
Vesting of restricted stock		(63)	63
Shares issued under employee stock purchase plan	227	(67)	294
Stock repurchase program	(300)		(300)
Stock-based compensation expense	259	259
Dividends declared	(2,077)			(2,077)
Other	(36)	(9)	2			(29)
Balance at Sep. 30, 2018	36,948	13,058	(3,924)	31,712	(4,313)	415
Balance at Jun. 30, 2018	36,897	13,030	(4,001)	31,760	(4,305)	413
Net income (loss)	658			644		14
Currency translation adjustments	(50)				(47)	(3)
Changes in unrealized gain on marketable securities	(12)				(12)
Changes in fair value of cash flow hedges	6				6
Pension and other postretirement benefit plans	44				44
Shares sold to optionees, less shares exchanged	6	(7)	13
Vesting of restricted stock		(10)	10
Shares issued under employee stock purchase plan	120	(34)	154
Stock repurchase program	(100)		(100)
Stock-based compensation expense	83	83
Dividends declared	(692)			(692)
Other	(12)	(4)			1	(9)
Balance at Sep. 30, 2018	36,948	13,058	(3,924)	31,712	(4,313)	415
Balance at Dec. 31, 2018	$ 36,586	$ 13,132	(4,006)	31,658	(4,622)	424
Balance, shares at Dec. 31, 2018	1,383	1,434
Treasury shares, Balance at Dec. 31, 2018	(51)
Net income (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
Vesting of restricted stock, shares	1		1
Shares issued under employee stock purchase plan	$ 196	(249)	$ 445
Shares issued under employee stock purchase plan, shares	6		6
Stock repurchase program	$ (278)		$ (278)
Stock repurchase program, shares	(7)		(7)
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, shares at Sep. 30, 2019	1,384	1,434
Treasury shares, Balance at Sep. 30, 2019	(50)
Shares sold to optionees, less shares exchanged	1		1
Balance at Jun. 30, 2019	$ 36,273	$ 13,037	$ (3,827)	31,186	(4,544)	421
Net income (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
Vesting of restricted stock		(20)	20
Shares issued under employee stock purchase plan	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, shares at Sep. 30, 2019	1,384	1,434
Treasury shares, Balance at Sep. 30, 2019	(50)