Regulatory Capital Requirements (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Senior preferred stock	$ 120,836	$ 120,836
Net worth	69,000
Shortfall of available capital	248,000
Adjusted total capital requirement (including buffers)	184,000
Adjusted total assets	4,562,000
Risk-weighted assets	1,316,000
Total capital
Available Capital (Deficit)	(42,000)
Minimum Capital Requirement	105,000
Total Capital Requirement (including Buffers)	$ 105,000
Available Capital (Deficit) Ratio	(0.032)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.080
Common equity tier 1 capital
Available Capital (Deficit)	$ (83,000)
Minimum Capital Requirement	59,000
Total Capital Requirement (including Buffers)	$ 138,000
Available Capital (Deficit) Ratio	(0.063)
Minimum Capital Ratio Requirement	0.045
Total Capital Requirement Ratio (including Buffers)	0.105
Tier 1 capital
Available Capital (Deficit)	$ (64,000)
Minimum Capital Requirement	79,000
Total Capital Requirement (including Buffers)	$ 158,000
Available Capital (Deficit) Ratio	(0.049)
Minimum Capital Ratio Requirement	0.060
Total Capital Requirement Ratio (including Buffers)	0.120
Adjusted total capital
Available Capital (Deficit)	$ (64,000)
Minimum Capital Requirement	105,000
Total Capital Requirement (including Buffers)	$ 184,000
Available Capital (Deficit) Ratio	(0.049)
Minimum Capital Ratio Requirement	0.080
Total Capital Requirement Ratio (including Buffers)	0.140
Core capital
Available Capital (Deficit)	$ (52,000)
Minimum Capital Requirement	114,000
Total Capital Requirement (including Buffers)	$ 114,000
Available Capital (Deficit) Ratio	(0.011)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.025
Tier 1 capital
Available Capital (Deficit)	$ (64,000)
Minimum Capital Requirement	114,000
Total Capital Requirement (including Buffers)	$ 137,000
Available Capital (Deficit) Ratio	(0.014)
Minimum Capital Ratio Requirement	0.025
Total Capital Requirement Ratio (including Buffers)	0.030
Deferred tax assets, net	$ 11,990	12,911
Preferred stock	$ 19,130	$ 19,130
Maximum payout ratio	0