Regulatory Capital Requirements (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Senior preferred stock	$ 120,836	$ 120,836
Net worth	58,800
Shortfall of available capital	258,000
Adjusted total capital requirement (including buffers)	183,000
Adjusted total assets	4,540,000
Risk-weighted assets	1,298,000
Total capital
Available Capital (Deficit)	(53,000)
Minimum Capital Requirement	104,000
Total Capital Requirement (including Buffers)	$ 104,000
Available Capital (Deficit) Ratio	(0.041)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.080
Common equity tier 1 capital
Available Capital (Deficit)	$ (94,000)
Minimum Capital Requirement	58,000
Total Capital Requirement (including Buffers)	$ 137,000
Available Capital (Deficit) Ratio	(0.072)
Minimum Capital Ratio Requirement	0.045
Total Capital Requirement Ratio (including Buffers)	0.106
Tier 1 capital
Available Capital (Deficit)	$ (75,000)
Minimum Capital Requirement	78,000
Total Capital Requirement (including Buffers)	$ 157,000
Available Capital (Deficit) Ratio	(0.058)
Minimum Capital Ratio Requirement	0.060
Total Capital Requirement Ratio (including Buffers)	0.121
Adjusted total capital
Available Capital (Deficit)	$ (75,000)
Minimum Capital Requirement	104,000
Total Capital Requirement (including Buffers)	$ 183,000
Available Capital (Deficit) Ratio	(0.058)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.141
Core capital
Available Capital (Deficit)	$ (62,000)
Minimum Capital Requirement	113,000
Total Capital Requirement (including Buffers)	$ 113,000
Available Capital (Deficit) Ratio	(0.014)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.025
Tier 1 capital
Available Capital (Deficit)	$ (75,000)
Minimum Capital Requirement	113,000
Total Capital Requirement (including Buffers)	$ 136,000
Available Capital (Deficit) Ratio	(0.017)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.030
Deferred tax assets, net	$ 12,729	12,715
Preferred stock	$ 19,130	$ 19,130
Maximum payout ratio	0