Fair Value of Financial Instruments - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 292,418	$ 274,026
Liabilities	(25,625)	(19,925)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,222	808
Liabilities	0	0
Significant Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	272,467	256,411
Liabilities	(6,549)	(3,469)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	18,729	16,807
Liabilities	(19,076)	(16,456)
Corporate bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	63,466	61,833
Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	56,179	54,808
Corporate bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	7,287	7,025
U.S. government bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	618	390
U.S. government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	598	370
U.S. government bonds | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
State and municipal bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,999	2,148
State and municipal bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,999	2,148
State and municipal bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Foreign government bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	240	233
Foreign government bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	240	233
Foreign government bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
RMBS | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,960	1,703
RMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
RMBS | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,948	1,691
RMBS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	12	12
CMBS | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,064	1,583
CMBS | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
CMBS | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,003	1,575
CMBS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	61	8
ABS | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	14,595	13,769
ABS | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
ABS | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	11,206	11,670
ABS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	3,389	2,099
Hybrid and redeemable preferred securities | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	244	241
Hybrid and redeemable preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	34	47
Hybrid and redeemable preferred securities | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	119	122
Hybrid and redeemable preferred securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	91	72
Trading securities | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,837	2,005
Trading securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,534	1,740
Trading securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	303	265
Equity securities | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	537	294
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	205	0
Equity securities | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	251	260
Equity securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	81	34
Mortgage loans on real estate | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	230	232
Mortgage loans on real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	230	232
Derivative investments | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	17,311	13,731
Derivative investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	17,279	13,728
Derivative investments | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	32	3
Other investments – short-term investments | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	222	392
Other investments – short-term investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Other investments – short-term investments | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	214	369
Other investments – short-term investments | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	8	23
MRB assets | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,694	4,860
MRB assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturity AFS securities
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
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
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,694	4,860
Ceded MRBs | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	17	14
Ceded MRBs | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(2,689)	(2,763)
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	17	14
Ceded MRBs | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(2,689)	(2,763)
Indexed annuity ceded embedded derivatives | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,320	1,970
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 | 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 Unobservable Inputs (Level 3) | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,320	1,970
LPR ceded derivative | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	204	190
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	204	190
Separate account assets | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	179,860	168,438
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	385	391
Separate account assets | Significant Observable Inputs (Level 2) | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	179,475	168,047
Separate account assets | Significant Unobservable Inputs (Level 3) | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
RILA, fixed indexed annuity and IUL contracts | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(14,918)	(12,449)
RILA, fixed indexed annuity and IUL contracts | 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
RILA, fixed indexed annuity and IUL contracts | Significant Observable Inputs (Level 2) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
RILA, fixed indexed annuity and IUL contracts | Significant Unobservable Inputs (Level 3) | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(14,918)	(12,449)
Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	188	728
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
Reinsurance-related embedded derivatives | Significant Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	324	787
Reinsurance-related embedded derivatives | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(136)	(59)
MRB liabilities | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,190)	(1,046)
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	(1,190)	(1,046)
Derivative liabilities | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(7,016)	(4,395)
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	(6,873)	(4,256)
Derivative liabilities | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ (143)	$ (139)