Fair Value of Financial Instruments - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 286,600	$ 263,539
Liabilities	(22,353)	(16,827)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	830	822
Liabilities	0	0
Significant Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	269,321	248,140
Liabilities	(6,542)	(4,299)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	16,449	14,577
Liabilities	(15,811)	(12,528)
Corporate bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	64,757	63,866
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	57,898	57,397
Corporate bonds | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	6,859	6,469
U.S. government bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	398	393
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	377	373
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	21	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	2,318	2,542
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	2,318	2,537
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	5
Foreign government bonds | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	248	278
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	248	278
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	1,714	1,602
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	1,701	1,589
RMBS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	13	13
CMBS | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,559	1,344
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	1,538	1,336
CMBS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	21	8
ABS | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	13,328	12,043
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	11,227	10,559
ABS | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,101	1,484
Hybrid and redeemable preferred securities | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	249	232
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	50	46
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	123	138
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	76	48
Trading securities | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,185	2,321
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	1,911	2,037
Trading securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	274	284
Equity securities | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	293	306
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	0	1
Equity securities | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	258	263
Equity securities | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	35	42
Mortgage loans on real estate | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	263	288
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	263	288
Derivative investments | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	16,054	11,327
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	16,045	10,705
Derivative investments | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	9	622
Other investments – short-term investments | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	230	233
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	210	233
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	20	0
Cash and invested cash | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,743	3,193
Cash and invested cash | 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
Cash and invested cash | Significant Observable Inputs (Level 2) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,743	3,193
Cash and invested cash | Significant Unobservable Inputs (Level 3) | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
MRB assets | Fixed maturity AFS securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,565	3,894
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	4,565	3,894
Ceded MRBs | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	50	274
Ceded MRBs | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(2,217)	(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	50	274
Ceded MRBs | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(2,217)	(1,149)
Indexed annuity ceded embedded derivatives | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,961	940
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	1,961	940
LPR ceded derivative | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	202	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	202	206
Separate account assets | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	171,483	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	403	402
Separate account assets | Significant Observable Inputs (Level 2) | Other assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	171,080	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
RILA, fixed indexed annuity and IUL contracts | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(12,270)	(9,077)
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	(12,270)	(9,077)
Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	103	493
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	145	493
Reinsurance-related embedded derivatives | Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(42)	0
MRB liabilities | Policyholder account balances
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,272)	(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	(1,272)	(1,716)
Derivative liabilities | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(6,697)	(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	(6,687)	(4,792)
Derivative liabilities | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ (10)	$ (586)