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]	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained earnings [Member]
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
Beginning balance (Current expected credit losses guidance [Member]) at Dec. 31, 2019							$ (9)	$ (9)
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)
Beginning balance (in shares) at Dec. 31, 2020		116,765,613
Beginning balance at Dec. 31, 2020	5,867	$ 3	8,822	15,292	(18,879)	629
Comprehensive income (loss) [Abstract]
Net income	437			437
Other comprehensive income (loss), net of tax	(312)					(312)
Total comprehensive income	125
Dividends to shareholders	(129)			(129)
Repurchase of common shares (in shares)		(2,589,698)
Repurchase of common shares	(554)				(554)
Share-based compensation plans (in shares)		1,812,356
Share-based compensation plans	193		160		33
Ending balance (in shares) at Mar. 31, 2021		115,988,271
Ending balance at Mar. 31, 2021	$ 5,502	$ 3	$ 8,982	$ 15,600	$ (19,400)	$ 317