Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Series B Preferred Stock	Series C Preferred Stock	Common stock and paid-in capital	Common stock and paid-in capital Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred stock	Preferred stock Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred stock Series B Preferred Stock	Preferred stock Series C Preferred Stock	Accumulated deficit	Accumulated deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated deficit Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated deficit Series B Preferred Stock	Accumulated deficit Series C Preferred Stock	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock	Treasury stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2019	$ 14,416	$ (1,017)	$ 13,399			$ 21,438	$ 21,438	$ 0	$ 0			$ (4,057)	$ (1,017)	$ (5,074)			$ 123	$ 123	$ (3,088)	$ (3,088)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,085											1,085
Share-based compensation	106					106
Other comprehensive income (loss)	508																508
Common stock repurchases	(106)																		(106)
Common stock dividends	(289)											(289)
Ending balance at Dec. 31, 2020	14,703					21,544		0				(4,278)					631		(3,194)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,060											3,060
Net proceeds from issuance of series preferred stock				$ 1,335	$ 989					$ 1,335	$ 989
Preferred stock dividends				(36)	(21)										$ (36)	$ (21)
Share-based compensation	127					127
Other comprehensive income (loss)	(789)																(789)
Common stock repurchases	(1,994)																		(1,994)
Common stock dividends	(324)											(324)
Ending balance at Dec. 31, 2021	17,050					21,671		2,324				(1,599)					(158)		(5,188)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,714											1,714
Preferred stock dividends				$ (63)	$ (47)										$ (63)	$ (47)
Share-based compensation	145					145
Other comprehensive income (loss)	(3,901)																(3,901)
Common stock repurchases	(1,650)																		(1,650)
Common stock dividends	(389)											(389)
Ending balance at Dec. 31, 2022	$ 12,859					$ 21,816		$ 2,324				$ (384)					$ (4,059)		$ (6,838)