Expected Loss to be Paid (Recovered) - Net Economic Loss Development (Benefit) U.S. RMBS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Expected Losses to be Paid [Line Items]
Economic Loss Development (Benefit)	$ (125)	$ (287)	$ 145
U.S. | RMBS
Schedule of Expected Losses to be Paid [Line Items]
Economic Loss Development (Benefit)	(143)	(100)	(71)
First Lien | U.S. | RMBS
Schedule of Expected Losses to be Paid [Line Items]
Economic Loss Development (Benefit)	36	0	(45)
Second Lien | U.S. | RMBS
Schedule of Expected Losses to be Paid [Line Items]
Economic Loss Development (Benefit)	$ (107)	$ (100)	$ (26)