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 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	796					796
Share-based compensation	22			22
Other comprehensive income (loss)	(604)								(604)
Common stock repurchases	(219)									(219)
Common stock dividends	(73)					(73)
Ending balance at Mar. 31, 2021	14,625			21,566	0	(3,555)			27	(3,413)
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
Share-based compensation	57			57
Other comprehensive income (loss)	(1,633)								(1,633)
Common stock repurchases	(584)									(584)
Common stock dividends	(104)					(104)
Preferred stock dividends		$ (16)	$ (12)				$ (16)	$ (12)
Ending balance at Mar. 31, 2022	$ 15,413			$ 21,728	$ 2,324	$ (1,076)			$ (1,791)	$ (5,772)