Fair Value of Financial Instruments - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 274,026	$ 260,346
Liabilities	(19,925)	(16,827)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	808	822
Liabilities	0	0
Significant Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	256,411	244,947
Liabilities	(3,469)	(4,299)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	16,807	14,577
Liabilities	(16,456)	(12,528)
Corporate bonds | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	61,833	63,866
Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Corporate bonds | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	54,808	57,397
Corporate bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	7,025	6,469
U.S. government bonds | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	390	393
U.S. government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	370	373
U.S. government bonds | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	20	20
U.S. government bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
State and municipal bonds | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,148	2,542
State and municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
State and municipal bonds | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,148	2,537
State and municipal bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	5
Foreign government bonds | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	233	278
Foreign government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Foreign government bonds | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	233	278
Foreign government bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
RMBS | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,703	1,602
RMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
RMBS | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,691	1,589
RMBS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	12	13
CMBS | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,583	1,344
CMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
CMBS | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,575	1,336
CMBS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	8	8
ABS | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	13,769	12,043
ABS | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
ABS | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	11,670	10,559
ABS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,099	1,484
Hybrid and redeemable preferred securities | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	241	232
Hybrid and redeemable preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	47	46
Hybrid and redeemable preferred securities | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	122	138
Hybrid and redeemable preferred securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	72	48
Trading securities | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,005	2,321
Trading securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Trading securities | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,740	2,037
Trading securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	265	284
Equity securities | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	294	306
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	1
Equity securities | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	260	263
Equity securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	34	42
Mortgage loans on real estate | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	232	288
Mortgage loans on real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Mortgage loans on real estate | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Mortgage loans on real estate | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	232	288
Derivative investments | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	13,731	11,327
Derivative investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Derivative investments | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	13,728	10,705
Derivative investments | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	3	622
Other investments | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	392	233
Other investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Other investments | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	369	233
Other investments | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	23	0
MRB assets | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,860	3,894
MRB assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
MRB assets | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
MRB assets | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities, at fair value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,860	3,894
Ceded MRBs | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	14	274
Ceded MRBs | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(2,763)	(1,149)
Ceded MRBs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Ceded MRBs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Ceded MRBs | Significant Observable Inputs (Level 2) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Ceded MRBs | Significant Observable Inputs (Level 2) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Ceded MRBs | Significant Unobservable Inputs (Level 3) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	14	274
Ceded MRBs | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(2,763)	(1,149)
Indexed annuity ceded embedded derivatives | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,970	940
Indexed annuity ceded embedded derivatives | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(12,449)	(9,077)
Indexed annuity ceded embedded derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Indexed annuity ceded embedded derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Indexed annuity ceded embedded derivatives | Significant Observable Inputs (Level 2) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Indexed annuity ceded embedded derivatives | Significant Observable Inputs (Level 2) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Indexed annuity ceded embedded derivatives | Significant Unobservable Inputs (Level 3) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,970	940
Indexed annuity ceded embedded derivatives | Significant Unobservable Inputs (Level 3) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(12,449)	(9,077)
LPR ceded derivative | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	190	206
LPR ceded derivative | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
LPR ceded derivative | Significant Observable Inputs (Level 2) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
LPR ceded derivative | Significant Unobservable Inputs (Level 3) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	190	206
Separate account assets | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	168,438	158,257
Separate account assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	391	402
Separate account assets | Significant Observable Inputs (Level 2) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	168,047	157,855
Separate account assets | Significant Unobservable Inputs (Level 3) | Other Assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	728	493
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives | Significant Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	787	493
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(59)	0
MRB liabilities | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,046)	(1,716)
MRB liabilities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
MRB liabilities | Significant Observable Inputs (Level 2) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
MRB liabilities | Significant Unobservable Inputs (Level 3) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,046)	(1,716)
Derivative liabilities | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(4,395)	(5,378)
Derivative liabilities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Derivative liabilities | Significant Observable Inputs (Level 2) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(4,256)	(4,792)
Derivative liabilities | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ (139)	$ (586)