Regulatory Capital Requirements (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Adjusted total assets	$ 4,460,000	$ 4,552,000
Risk-weighted assets	1,364,000	1,357,000
Total capital (statutory)
Available Capital (Deficit)	(18,000)	(34,000)
Minimum Capital Requirement	109,000	109,000
Total Capital Requirement (including buffers)	$ 109,000	$ 109,000
Available Capital (Deficit) Ratio	(0.013)	(0.025)
Minimum Capital Ratio Requirement	0.080	0.080
Total Capital Requirement Ratio (including Buffers)	0.080	0.080
Common equity tier 1 capital
Available Capital (Deficit)	$ (56,000)	$ (74,000)
Minimum Capital Requirement	61,000	61,000
Total Capital Requirement (including buffers)	$ 142,000	$ 140,000
Available Capital (Deficit) Ratio	(0.041)	(0.055)
Minimum Capital Ratio Requirement	0.045	0.045
Total Capital Requirement Ratio (including Buffers)	0.104	0.103
Tier 1 capital
Available Capital (Deficit)	$ (37,000)	$ (55,000)
Minimum Capital Requirement	82,000	81,000
Total Capital Requirement (including buffers)	$ 163,000	$ 160,000
Available Capital (Deficit) Ratio	(0.027)	(0.041)
Minimum Capital Ratio Requirement	0.060	0.060
Total Capital Requirement Ratio (including Buffers)	0.119	0.118
Adjusted total capital
Available Capital (Deficit)	$ (37,000)	$ (55,000)
Minimum Capital Requirement	109,000	109,000
Total Capital Requirement (including buffers)	$ 190,000	$ 188,000
Available Capital (Deficit) Ratio	(0.027)	(0.041)
Minimum Capital Ratio Requirement	0.080	0.080
Total Capital Requirement Ratio (including Buffers)	0.139	0.139
Core capital (statutory)
Available Capital (Deficit)	$ (26,000)	$ (43,000)
Minimum Capital Requirement	111,000	114,000
Total Capital Requirement (including buffers)	$ 111,000	$ 114,000
Available Capital (Deficit) Ratio	(0.006)	(0.009)
Minimum Capital Ratio Requirement	0.025	0.025
Total Capital Requirement Ratio (including Buffers)	0.025	0.025
Tier 1 capital
Available Capital (Deficit)	$ (37,000)	$ (55,000)
Minimum Capital Requirement	111,000	114,000
Total Capital Requirement (including buffers)	$ 135,000	$ 137,000
Available Capital (Deficit) Ratio	(0.008)	(0.012)
Minimum Capital Ratio Requirement	0.025	0.025
Total Capital Requirement Ratio (including Buffers)	0.030	0.030
Senior preferred stock value	$ 120,836	$ 120,836