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, 2018		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			170,000,000
Adoption of new accounting standards					161	(161)
Net income	342				342		342
Other comprehensive (loss) income	$ (98)					(98)	(98)
Purchases of treasury stock (in shares)	8,100,000		8,000,000
Purchases of treasury stock	$ (586)		$ (586)				(586)
Stock issued under employee benefit plans and other (in shares)			(5,000,000)
Stock issued under employee benefit plans and other	166		$ 291	(59)	(66)		166
Dividends declared on common stock	(98)				(98)		(98)
Change in noncontrolling interests	1							1
End of period (in shares) at Mar. 31, 2019		683,000,000
End of period at Mar. 31, 2019	$ 7,593	$ 683	$ (10,284)	5,839	15,414	(4,082)	7,570	23
End of period, treasury shares (in shares) at Mar. 31, 2019			173,000,000
Beginning of period (in shares) at Dec. 31, 2019	683,494,944	683,000,000
Beginning of period at Dec. 31, 2019	$ 7,912	$ 683	$ (10,764)	5,955	15,718	(3,710)	7,882	30
Beginning of period, treasury shares (in shares) at Dec. 31, 2019	177,340,358		177,000,000
Adoption of new accounting standards	$ (4)				(4)		(4)
Net income	333				332		332	1
Other comprehensive (loss) income	(467)					(467)	(467)
Stock issued under employee benefit plans and other (in shares)			(2,000,000)
Stock issued under employee benefit plans and other	67		$ 87	(20)			67
Dividends declared on common stock	$ (111)				(111)		(111)
End of period (in shares) at Mar. 31, 2020	683,494,944	683,000,000
End of period at Mar. 31, 2020	$ 7,730	$ 683	$ (10,677)	$ 5,935	$ 15,935	$ (4,177)	$ 7,699	$ 31
End of period, treasury shares (in shares) at Mar. 31, 2020	175,106,170		175,000,000