Fair Value of Financial Instruments - Components of the Transfers In and Out of Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Corporate bonds
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 0	$ 90	$ 56	$ 112
Transfers Out of Level 3	(57)	(1)	(833)	(1)
Total	(57)	89	(777)	111
RMBS
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	0	(7)	0	(7)
Total	0	(7)	0	(7)
CMBS
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	(28)	(7)	(37)	(7)
Total	(28)	(7)	(37)	(7)
ABS
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	17	13	41	70
Transfers Out of Level 3	(156)	(52)	(172)	(52)
Total	(139)	(39)	(131)	18
Trading securities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			0	20
Transfers Out of Level 3			(22)	0
Total			(22)	20
Equity securities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	0	54	0	54
Transfers Out of Level 3	0	0	0	0
Total	0	54	0	54
Other investments – short-term investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	(28)	0	(28)	0
Total	$ (28)	$ 0	$ (28)	$ 0