Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Common Stock in Treasury	Additional Contributed Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Parent	Noncontrolling Interest
Beginning of period (in shares) at Dec. 31, 2017		683,000,000
Beginning of period at Dec. 31, 2017	$ 9,109	$ 683	$ (7,981)	$ 5,940	$ 14,014	$ (3,539)	$ 9,117	$ (8)
Beginning of period, treasury shares (in shares) at Dec. 31, 2017			142,000,000
Adoption of new accounting standards	(23)				(20)	(3)	(23)
Net income	1,241				1,241		1,241
Other comprehensive income (loss)	$ (212)					(212)	(212)
Purchases of treasury stock (in shares)	14,900,000		15,000,000
Purchases of treasury stock	$ (1,028)		$ (1,028)				(1,028)
Stock issued under employee benefit plans and other (in shares)			(7,000,000)
Stock issued under employee benefit plans and other	302		$ 370	(9)	(59)		302
Dividends declared on common stock	(290)				(290)		(290)
Change in noncontrolling interests	(9)							(9)
End of period (in shares) at Sep. 30, 2018		683,000,000
End of period at Sep. 30, 2018	9,090	$ 683	$ (8,639)	5,931	14,886	(3,754)	9,107	(17)
End of period, treasury shares (in shares) at Sep. 30, 2018			150,000,000
Beginning of period (in shares) at Dec. 31, 2017		683,000,000
Beginning of period at Dec. 31, 2017	$ 9,109	$ 683	$ (7,981)	5,940	14,014	(3,539)	9,117	(8)
Beginning of period, treasury shares (in shares) at Dec. 31, 2017			142,000,000
End of period (in shares) at Dec. 31, 2018	683,494,944	683,000,000
End of period at Dec. 31, 2018	$ 7,866	$ 683	$ (9,989)	5,898	15,075	(3,823)	7,844	22
End of period, treasury shares (in shares) at Dec. 31, 2018	170,495,859		170,000,000
Beginning of period (in shares) at Jun. 30, 2018		683,000,000
Beginning of period at Jun. 30, 2018	$ 8,830	$ 683	$ (8,485)	5,916	14,484	(3,756)	8,842	(12)
Beginning of period, treasury shares (in shares) at Jun. 30, 2018			148,000,000
Net income	518				518		518
Other comprehensive income (loss)	2					2	2
Purchases of treasury stock (in shares)			4,000,000
Purchases of treasury stock	(247)		$ (247)				(247)
Stock issued under employee benefit plans and other (in shares)			(2,000,000)
Stock issued under employee benefit plans and other	94		$ 93	15	(14)		94
Dividends declared on common stock	(102)				(102)		(102)
Change in noncontrolling interests	(5)							(5)
End of period (in shares) at Sep. 30, 2018		683,000,000
End of period at Sep. 30, 2018	$ 9,090	$ 683	$ (8,639)	5,931	14,886	(3,754)	9,107	(17)
End of period, treasury shares (in shares) at Sep. 30, 2018			150,000,000
Beginning of period (in shares) at Dec. 31, 2018	683,494,944	683,000,000
Beginning of period at Dec. 31, 2018	$ 7,866	$ 683	$ (9,989)	5,898	15,075	(3,823)	7,844	22
Beginning of period, treasury shares (in shares) at Dec. 31, 2018	170,495,859		170,000,000
Adoption of new accounting standards	$ 0				161	(161)
Net income	1,030				1,024		1,024	6
Other comprehensive income (loss)	$ (304)					(304)	(304)
Purchases of treasury stock (in shares)	13,500,000		14,000,000
Purchases of treasury stock	$ (1,043)		$ (1,089)	46			(1,043)
Stock issued under employee benefit plans and other (in shares)			(9,000,000)
Stock issued under employee benefit plans and other	394		$ 496	(18)	(84)		394
Dividends declared on common stock	(327)				(327)		(327)
Change in noncontrolling interests	$ 1							1
End of period (in shares) at Sep. 30, 2019	683,494,944	683,000,000
End of period at Sep. 30, 2019	$ 7,617	$ 683	$ (10,582)	5,926	15,849	(4,288)	7,588	29
End of period, treasury shares (in shares) at Sep. 30, 2019	175,461,299		175,000,000
Beginning of period (in shares) at Jun. 30, 2019		683,000,000
Beginning of period at Jun. 30, 2019	$ 7,803	$ 683	$ (10,322)	5,906	15,598	(4,086)	7,779	24
Beginning of period, treasury shares (in shares) at Jun. 30, 2019			173,000,000
Net income	375				369		369	6
Other comprehensive income (loss)	(202)					(202)	(202)
Purchases of treasury stock (in shares)			4,000,000
Purchases of treasury stock	(346)		$ (346)	0			(346)
Stock issued under employee benefit plans and other (in shares)			(2,000,000)
Stock issued under employee benefit plans and other	105		$ 86	20	(1)		105
Dividends declared on common stock	(117)				(117)		(117)
Change in noncontrolling interests	$ (1)							(1)
End of period (in shares) at Sep. 30, 2019	683,494,944	683,000,000
End of period at Sep. 30, 2019	$ 7,617	$ 683	$ (10,582)	$ 5,926	$ 15,849	$ (4,288)	$ 7,588	$ 29
End of period, treasury shares (in shares) at Sep. 30, 2019	175,461,299		175,000,000