Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common equities	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Previously Reported Retained Earnings
Increase to allowance through retained earnings for ASU 2016-13, after-tax				$ (2)
Beginning Balance at Dec. 31, 2019		$ 397	$ 1,306	9,255	$ 448	$ (1,544)	$ 9,257
Share-based awards		0	(16)			11
Share-based compensation			9
Other			1			1
Net Income (Loss)	$ (1,226)			(1,226)
Dividends declared				(97)
Other comprehensive income	(244)				(244)
Shares acquired - share repurchase authorization						(256)
Shares acquired - share-based compensation plans						(3)
Ending Balance at Mar. 31, 2020	8,042	$ 397	1,300	7,932	204	(1,791)
Beginning Balance (in shares) at Dec. 31, 2019		162.9
Share-based awards (in shares)		0.4
Shares acquired - share repurchase authorization (in shares)		(2.5)
Ending Balance (in shares) at Mar. 31, 2020		160.8
Dividends declared per common share		$ 0.60
Increase to allowance through retained earnings for ASU 2016-13, after-tax				0
Beginning Balance at Dec. 31, 2020	10,789	$ 397	1,328	10,085	769	(1,790)	$ 10,085
Share-based awards		0	(16)			12
Share-based compensation			9
Other			1			0
Net Income (Loss)	620			620
Dividends declared				(102)
Other comprehensive income	(144)				(144)
Shares acquired - share repurchase authorization						(28)
Shares acquired - share-based compensation plans						(3)
Ending Balance at Mar. 31, 2021	$ 11,138	$ 397	$ 1,322	$ 10,603	$ 625	$ (1,809)
Beginning Balance (in shares) at Dec. 31, 2020		160.9
Share-based awards (in shares)		0.4
Shares acquired - share repurchase authorization (in shares)		(0.3)
Ending Balance (in shares) at Mar. 31, 2021		161.0
Dividends declared per common share		$ 0.63