Regulatory Capital Requirements (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Senior preferred stock value	$ 120,836	$ 120,836
Net worth	77,700	60,300
Shortfall of available capital	243,000	258,000
Adjusted total capital requirement (including buffers)	188,000	184,000
Adjusted total assets	4,552,000	4,552,000
Risk-weighted assets	1,357,000	1,316,000
Total capital (statutory)
Available Capital (Deficit)	(34,000)	(49,000)
Minimum Capital Requirement	109,000	105,000
Total Capital Requirement (including buffers)	$ 109,000	$ 105,000
Available Capital (Deficit) Ratio	(0.025)	(0.037)
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)	$ (74,000)	$ (93,000)
Minimum Capital Requirement	61,000	59,000
Total Capital Requirement (including buffers)	$ 140,000	$ 138,000
Available Capital (Deficit) Ratio	(0.055)	(0.070)
Minimum Capital Ratio Requirement	0.045	0.045
Total Capital Requirement Ratio (including Buffers)	0.103	0.105
Tier 1 capital
Available Capital (Deficit)	$ (55,000)	$ (74,000)
Minimum Capital Requirement	81,000	79,000
Total Capital Requirement (including buffers)	$ 160,000	$ 158,000
Available Capital (Deficit) Ratio	(0.041)	(0.056)
Minimum Capital Ratio Requirement	0.060	0.060
Total Capital Requirement Ratio (including Buffers)	0.118	0.120
Adjusted total capital
Available Capital (Deficit)	$ (55,000)	$ (74,000)
Minimum Capital Requirement	109,000	105,000
Total Capital Requirement (including buffers)	$ 188,000	$ 184,000
Available Capital (Deficit) Ratio	(0.041)	(0.056)
Minimum Capital Ratio Requirement	0.080	0.080
Total Capital Requirement Ratio (including Buffers)	0.139	0.140
Core capital (statutory)
Available Capital (Deficit)	$ (43,000)	$ (61,000)
Minimum Capital Requirement	114,000	114,000
Total Capital Requirement (including buffers)	$ 114,000	$ 114,000
Available Capital (Deficit) Ratio	(0.009)	(0.013)
Minimum Capital Ratio Requirement	0.025	0.025
Total Capital Requirement Ratio (including Buffers)	0.025	0.025
Tier 1 capital
Available Capital (Deficit)	$ (55,000)	$ (74,000)
Minimum Capital Requirement	114,000	114,000
Total Capital Requirement (including buffers)	$ 137,000	$ 137,000
Available Capital (Deficit) Ratio	(0.012)	(0.016)
Minimum Capital Ratio Requirement	0.025	0.025
Total Capital Requirement Ratio (including Buffers)	0.030	0.030
Deferred tax assets, net	$ 11,681	$ 12,911
Preferred stock	$ 19,130	$ 19,130
Maximum payout ratio	0	0