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		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	$ 192	$ 186	$ 192	$ 186	$ 141	$ 101	$ 150	$ 106
Net economic loss development (benefit)	48	36	92	21
Insurance
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	179		179			88
Net economic loss development (benefit)	48	38	92	86
FG VIEs' assets
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	13		13			13
Net economic loss development (benefit)	0	(1)	0	(1)
Credit derivatives
Schedule of Expected Losses to be Paid [Line Items]
Net Expected Loss to be Paid (Recovered)	0		0			$ 0
Net economic loss development (benefit)	$ 0	$ (1)	$ 0	$ (64)