Background and Business Description - Settlement of RMBS Litigation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gain (Loss) Related to Litigation Settlement		$ 126	$ 0
Loss Reserves [Member]
Gain (Loss) Related to Litigation Settlement	$ 362
Litigation Recoveries
Gain (Loss) Related to Litigation Settlement	126
Gain (loss) on extinguishment of debt
Gain (Loss) Related to Litigation Settlement	(53)
Gain (Loss) on Investments [Member]
Gain (Loss) Related to Litigation Settlement	5
R&W value
Loss and Loss Benjefit Relating to R&W Recoveries	123
Bank of America
Proceeds from Legal Settlements	1,840
Gain (Loss) Related to Litigation Settlement	440
Nomura Credit & Capital, Inc.
Proceeds from Legal Settlements	$ 140