Fair Value of Financial Instruments - Components of the Transfers In and Out of Level 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 279	$ 352	$ 554
Transfers Out of Level 3	(608)	(3,393)	(3,267)
Total	(329)	(3,041)	(2,713)
Corporate bonds
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	194	296	164
Transfers Out of Level 3	(206)	(2,962)	(134)
Total	(12)	(2,666)	30
State and municipal bonds
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		36
Transfers Out of Level 3		0
Total		36
Foreign government bonds
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		0	0
Transfers Out of Level 3		(5)	(102)
Total		(5)	(102)
RMBS
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	12	0	0
Transfers Out of Level 3	(5)	(24)	(1)
Total	7	(24)	(1)
CMBS
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	12	0	0
Transfers Out of Level 3	0	(17)	(8)
Total	12	(17)	(8)
ABS
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	2	16	36
Transfers Out of Level 3	(377)	(332)	(330)
Total	(375)	(316)	(294)
Hybrid and redeemable preferred securities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	16	0
Transfers Out of Level 3	(13)	(4)
Total	3	(4)
Trading securities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	6	4	12
Transfers Out of Level 3	(7)	(19)	(34)
Total	(1)	(15)	(22)
Equity securities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	6	0
Transfers Out of Level 3	0	(15)
Total	6	(15)
Derivative investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	31	0	24
Transfers Out of Level 3	0	(15)	(2,658)
Total	$ 31	$ (15)	(2,634)
Other assets – LPR ceded derivative
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			318
Transfers Out of Level 3			0
Total			$ 318