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	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	$ 433	$ 517	$ 505	$ 522
Net economic loss development (benefit)	(7)	11
Insurance
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	191		263
Net economic loss development (benefit)	(7)	6
FG VIEs' assets
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	241		240
Net economic loss development (benefit)	0	5
Credit derivatives
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	1		$ 2
Net economic loss development (benefit)	$ 0	$ 0