CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common shares [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury shares [Member]	AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting policy	$ (5)
Cumulative effect of change in accounting policy | Cumulative effect of adoption of equity securities guidance				$ (5)
Beginning balance (in shares) at Dec. 31, 2018		136,330,747
Beginning balance at Dec. 31, 2018	5,588	$ 3	$ 8,260	12,909	$ (15,293)	$ (291)
Comprehensive income (loss) [Abstract]
Net income	395			395
Other comprehensive income (loss), net of tax	326					326
Total comprehensive income	721
Dividends to shareholders	(127)			(127)
Repurchase of common shares (in shares)		(3,199,907)
Repurchase of common shares	(399)				(399)
Share-based compensation plans (in shares)		1,052,667
Share-based compensation plans	65		10		55
Ending balance (in shares) at Mar. 31, 2019		134,183,507
Ending balance at Mar. 31, 2019	5,843	$ 3	8,270	13,172	(15,637)	35
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting policy	(9)
Cumulative effect of change in accounting policy | Accounting Standards Update 2016-13 [Member]				(9)
Beginning balance (in shares) at Dec. 31, 2019		123,939,234
Beginning balance at Dec. 31, 2019	5,729	$ 3	8,461	14,279	(17,276)	262
Comprehensive income (loss) [Abstract]
Net income	2,036			2,036
Other comprehensive income (loss), net of tax	(557)					(557)
Total comprehensive income	1,479
Dividends to shareholders	(126)			(126)
Repurchase of common shares (in shares)		(3,382,619)
Repurchase of common shares	(537)				(537)
Share-based compensation plans (in shares)		1,778,272
Share-based compensation plans	157		117		40
Ending balance (in shares) at Mar. 31, 2020		122,334,887
Ending balance at Mar. 31, 2020	$ 6,693	$ 3	$ 8,578	$ 16,180	$ (17,773)	$ (295)