CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Shares	Additional Paid-In Capital	Retained Earnings	Treasury Shares	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings
Balances (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)
Beginning balance (Premium amortization on purchased callable debt securities guidance) at Dec. 31, 2018							$ (5)	$ (5)
Increase (Decrease) in Stockholders' Equity
Net income	1,893			1,893
Other comprehensive income (loss), net of tax	553					553
Dividends to shareholders	(518)			(518)
Repurchase of common shares	(2,039)				(2,039)
Repurchase of common shares (in shares)		(14,396,367)
Share-based compensation plans	257		201		56
Share-based compensation plans (in shares)		2,004,854
Balances (in shares) at Dec. 31, 2019		123,939,234
Ending balance at Dec. 31, 2019	5,729	$ 3	8,461	14,279	(17,276)	262
Ending balance (Current expected credit losses guidance) at Dec. 31, 2019							$ (9)	$ (9)
Increase (Decrease) in Stockholders' Equity
Net income	1,534			1,534
Other comprehensive income (loss), net of tax	367					367
Dividends to shareholders	(512)			(512)
Repurchase of common shares	(1,647)				(1,647)
Repurchase of common shares (in shares)		(10,241,160)
Share-based compensation plans	405		361		44
Share-based compensation plans (in shares)		3,067,539
Balances (in shares) at Dec. 31, 2020		116,765,613
Ending balance at Dec. 31, 2020	5,867	$ 3	8,822	15,292	(18,879)	629
Increase (Decrease) in Stockholders' Equity
Net income	2,760			2,760
Other comprehensive income (loss), net of tax	(626)					(626)
Dividends to shareholders	(527)			(527)
Repurchase of common shares	(2,222)				(2,222)
Repurchase of common shares (in shares)		(8,744,127)
Share-based compensation plans	433		398		35
Share-based compensation plans (in shares)		2,839,524
Balances (in shares) at Dec. 31, 2021		110,861,010
Ending balance at Dec. 31, 2021	$ 5,685	$ 3	$ 9,220	$ 17,525	$ (21,066)	$ 3