Consolidated Statements of Changes in Equity (Deficit) - USD ($) shares in Millions, $ in Millions	Total	Transition impact of the adoption of the CECL standard	Adjusted balance	Senior Preferred Stock	Senior Preferred Stock Adjusted balance	Preferred Stock	Preferred Stock Adjusted balance	Common Stock	Common Stock Adjusted balance	Accumulated Deficit	Accumulated Deficit Transition impact of the adoption of the CECL standard	Accumulated Deficit Adjusted balance	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Adjusted balance	Treasury Stock	Treasury Stock Adjusted balance
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	ASU 2016-13
Beginning balance (shares) at Dec. 31, 2018				1		556		1,158
Beginning balance at Dec. 31, 2018	$ 6,240			$ 120,836		$ 19,130		$ 687		$ (127,335)			$ 322		$ (7,400)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Senior preferred stock dividends paid	(5,601)									(5,601)
Comprehensive income:
Net income	14,160									14,160
Other comprehensive income, net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of taxes	1												1
Reclassification adjustment for gains included in net income, net of taxes	(180)												(180)
Other, net of taxes	(12)												(12)
Total comprehensive income	13,969
Ending balance at Dec. 31, 2019	14,608	$ (1,139)	$ 13,469	$ 120,836	$ 120,836	$ 19,130	$ 19,130	$ 687	$ 687	(118,776)	$ (1,139)	$ (119,915)	131	$ 131	(7,400)	$ 7,400
Ending balance (shares) at Dec. 31, 2019				1		556		1,158
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Senior preferred stock dividends paid	0
Comprehensive income:
Net income	11,805									11,805
Other comprehensive income, net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of taxes	(12)												(12)
Reclassification adjustment for gains included in net income, net of taxes	(11)												(11)
Other, net of taxes	8												8
Total comprehensive income	11,790
Ending balance at Dec. 31, 2020	25,259			$ 120,836		$ 19,130		$ 687		(108,110)			116		(7,400)
Ending balance (shares) at Dec. 31, 2020				1		556		1,158
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Senior preferred stock dividends paid	0
Comprehensive income:
Net income	22,176									22,176
Other comprehensive income, net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of taxes	(18)												(18)
Reclassification adjustment for gains included in net income, net of taxes	(49)												(49)
Other, net of taxes	(11)												(11)
Total comprehensive income	22,098
Ending balance at Dec. 31, 2021	$ 47,357			$ 120,836		$ 19,130		$ 687		$ (85,934)			$ 38		$ (7,400)
Ending balance (shares) at Dec. 31, 2021				1		556		1,158