Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid (Recovered) and Net Economic Loss Development (Benefit) by Accounting Model (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	$ 522	$ 411	$ 529	$ 737
Net Economic Loss Development (Benefit)	(125)	(287)	145
Insurance Contracts
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	205	364
Net Economic Loss Development (Benefit)	(112)	(281)	142
Financial Guarantee Variable Interest Entities
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	314	42
Net Economic Loss Development (Benefit)	(17)	(20)	1
Financial Guarantee Accounted for as Credit Derivatives
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	3	5
Net Economic Loss Development (Benefit)	$ 4	$ 14	$ 2