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	Accumulated deficit	Accumulated deficit Series B Preferred Stock	Accumulated deficit Series C Preferred Stock	Accumulated other comprehensive loss	Treasury stock
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	655					655
Preferred stock dividends		$ (16)	$ (12)				$ (16)	$ (12)
Share-based compensation	57			57
Other comprehensive income (loss)	(1,633)								(1,633)
Common stock repurchases	(584)									(584)
Common stock dividends	(104)					(104)
Ending balance at Mar. 31, 2022	15,413			21,728	2,324	(1,076)			(1,791)	(5,772)
Beginning balance at Dec. 31, 2022	12,859			21,816	2,324	(384)			(4,059)	(6,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	319					319
Preferred stock dividends		$ (16)	$ (12)				$ (16)	$ (12)
Share-based compensation	64			64
Other comprehensive income (loss)	283								283
Common stock repurchases	(27)									(27)
Common stock dividends	(92)					(92)
Ending balance at Mar. 31, 2023	$ 13,378			$ 21,880	$ 2,324	$ (185)			$ (3,776)	$ (6,865)