Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Series B Preferred Stock	Series C Preferred Stock	Common stock and paid-in capital	Preferred stock	Preferred stock Series B Preferred Stock	Preferred stock Series C Preferred Stock	Accumulated deficit	Accumulated deficit Series B Preferred Stock	Accumulated deficit Series C Preferred Stock	Accumulated other comprehensive income (loss)	Treasury stock
Beginning balance at Dec. 31, 2020	$ 14,703			$ 21,544	$ 0			$ (4,278)			$ 631	$ (3,194)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,408							2,408
Preferred stock dividends		$ (20)	$ (9)						$ (20)	$ (9)
Net proceeds from issuance of series preferred stock		1,335	989			$ 1,335	$ 989
Share-based compensation	100			100
Other comprehensive income (loss)	(580)										(580)
Common stock repurchases	(1,400)											(1,400)
Common stock dividends	(237)							(237)
Ending balance at Sep. 30, 2021	17,289			21,644	2,324			(2,136)			51	(4,594)
Beginning balance at Jun. 30, 2021	17,530			21,631	2,324			(2,726)			216	(3,915)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	712							712
Preferred stock dividends		(20)	(9)						(20)	(9)
Share-based compensation	13			13
Other comprehensive income (loss)	(165)										(165)
Common stock repurchases	(679)											(679)
Common stock dividends	(93)							(93)
Ending balance at Sep. 30, 2021	17,289			21,644	2,324			(2,136)			51	(4,594)
Beginning 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	1,436							1,436
Preferred stock dividends		(48)	(35)						(48)	(35)
Share-based compensation	110			110
Other comprehensive income (loss)	(4,182)										(4,182)
Common stock repurchases	(1,599)											(1,599)
Common stock dividends	(298)							(298)
Ending balance at Sep. 30, 2022	12,434			21,781	2,324			(544)			(4,340)	(6,787)
Beginning balance at Jun. 30, 2022	13,984			21,762	2,324			(721)			(3,009)	(6,372)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	299							299
Preferred stock dividends		$ (16)	$ (11)						$ (16)	$ (11)
Share-based compensation	19			19
Other comprehensive income (loss)	(1,331)										(1,331)
Common stock repurchases	(415)											(415)
Common stock dividends	(95)							(95)
Ending balance at Sep. 30, 2022	$ 12,434			$ 21,781	$ 2,324			$ (544)			$ (4,340)	$ (6,787)