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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, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	$ 505	$ 522	$ 411	$ 529
Net Economic Loss Development (Benefit)	164	(125)	(287)
Insurance Contracts
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	263	205
Net Economic Loss Development (Benefit)	174	(112)	(281)
Financial Guarantee Variable Interest Entities
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	240	314
Net Economic Loss Development (Benefit)	(11)	(17)	(20)
Financial Guarantee Accounted for as Credit Derivatives
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	2	3
Net Economic Loss Development (Benefit)	$ 1	$ 4	$ 14