Regulatory Capital Requirements (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Senior preferred stock	$ 120,836	$ 120,836
Net worth	64,000
Shortfall of available capital	253,000
Adjusted total capital requirement (including buffers)	184,000
Adjusted total assets	4,560,000
Risk-weighted assets	1,308,000
Total capital
Available Capital (Deficit)	(45,000)
Minimum Capital Requirement	105,000
Total Capital Requirement (including Buffers)	$ 105,000
Available Capital (Deficit) Ratio	(0.035)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.080
Common equity tier 1 capital
Available Capital (Deficit)	$ (89,000)
Minimum Capital Requirement	59,000
Total Capital Requirement (including Buffers)	$ 138,000
Available Capital (Deficit) Ratio	(0.068)
Minimum Capital Ratio Requirement	0.045
Total Capital Requirement Ratio (including Buffers)	0.106
Tier 1 capital
Available Capital (Deficit)	$ (69,000)
Minimum Capital Requirement	78,000
Total Capital Requirement (including Buffers)	$ 157,000
Available Capital (Deficit) Ratio	(0.053)
Minimum Capital Ratio Requirement	0.060
Total Capital Requirement Ratio (including Buffers)	0.120
Adjusted total capital
Available Capital (Deficit)	$ (69,000)
Minimum Capital Requirement	105,000
Total Capital Requirement (including Buffers)	$ 184,000
Available Capital (Deficit) Ratio	(0.053)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.141
Core capital
Available Capital (Deficit)	$ (57,000)
Minimum Capital Requirement	114,000
Total Capital Requirement (including Buffers)	$ 114,000
Available Capital (Deficit) Ratio	(0.012)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.025
Tier 1 capital
Available Capital (Deficit)	$ (69,000)
Minimum Capital Requirement	114,000
Total Capital Requirement (including Buffers)	$ 137,000
Available Capital (Deficit) Ratio	(0.015)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.030
Deferred tax assets, net	$ 12,615	12,911
Preferred stock	$ 19,130	$ 19,130
Maximum payout ratio	0