Regulatory Capital Requirements (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Senior preferred stock	$ 120,836	$ 120,836
Net worth	51,800
Shortfall of available capital	272,000
Adjusted total capital requirement (including buffers)	190,000
Adjusted total assets	4,529,000
Risk-weighted assets	1,391,000
Total capital
Available Capital (Deficit)	(63,000)
Minimum Capital Requirement	111,000
Total Capital Requirement (including Buffers)	$ 111,000
Available Capital (Deficit) Ratio	(0.045)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.080
Common equity tier 1 capital
Available Capital (Deficit)	$ (101,000)
Minimum Capital Requirement	63,000
Total Capital Requirement (including Buffers)	$ 142,000
Available Capital (Deficit) Ratio	(0.073)
Minimum Capital Ratio Requirement	0.045
Total Capital Requirement Ratio (including Buffers)	0.102
Tier 1 capital
Available Capital (Deficit)	$ (82,000)
Minimum Capital Requirement	83,000
Total Capital Requirement (including Buffers)	$ 162,000
Available Capital (Deficit) Ratio	(0.059)
Minimum Capital Ratio Requirement	0.060
Total Capital Requirement Ratio (including Buffers)	0.116
Adjusted total capital
Available Capital (Deficit)	$ (82,000)
Minimum Capital Requirement	111,000
Total Capital Requirement (including Buffers)	$ 190,000
Available Capital (Deficit) Ratio	(0.059)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.136
Core capital
Available Capital (Deficit)	$ (69,000)
Minimum Capital Requirement	113,000
Total Capital Requirement (including Buffers)	$ 113,000
Available Capital (Deficit) Ratio	(0.015)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.025
Tier 1 capital
Available Capital (Deficit)	$ (82,000)
Minimum Capital Requirement	113,000
Total Capital Requirement (including Buffers)	$ 136,000
Available Capital (Deficit) Ratio	(0.018)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.030
Deferred tax assets, net	$ 13,075	12,715
Preferred stock	$ 19,130	$ 19,130
Maximum payout ratio	0