Fair Value of Financial Instruments - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 282,213	$ 269,878
Liabilities	(20,446)	(16,962)
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	67,313	69,657
U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	389	393
State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,564	2,790
Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	260	283
RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,795	1,773
CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,542	1,424
ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	13,072	12,171
Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	239	247
Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,201	2,359
Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	295	306
Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	258	288
Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	15,658	11,496
Other investments – short-term investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	230	233
Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	5,475	3,365
MRB assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,754	3,894
Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	2
Liabilities	(344)	(239)
RILA, fixed indexed annuity and IUL contracts
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	967	940
Liabilities	(11,417)	(9,077)
Separate account assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	165,199	158,257
Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(155)	(552)
MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,275)	(1,716)
Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(7,255)	(5,378)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	816	823
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	369	374
Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	48	46
Quoted Prices in Active Markets for Identical Assets (Level 1) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other investments – short-term investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | MRB assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | RILA, fixed indexed annuity and IUL contracts
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Separate account assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	397	402
Quoted Prices in Active Markets for Identical Assets (Level 1) | Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Significant Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	269,649	258,928
Liabilities	(6,411)	(4,555)
Significant Observable Inputs (Level 2) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	64,732	67,160
Significant Observable Inputs (Level 2) | U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	20	19
Significant Observable Inputs (Level 2) | State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,564	2,785
Significant Observable Inputs (Level 2) | Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	260	283
Significant Observable Inputs (Level 2) | RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,777	1,760
Significant Observable Inputs (Level 2) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,519	1,416
Significant Observable Inputs (Level 2) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	11,075	10,687
Significant Observable Inputs (Level 2) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	141	153
Significant Observable Inputs (Level 2) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,928	2,075
Significant Observable Inputs (Level 2) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	255	263
Significant Observable Inputs (Level 2) | Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Observable Inputs (Level 2) | Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	14,871	10,874
Significant Observable Inputs (Level 2) | Other investments – short-term investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	230	233
Significant Observable Inputs (Level 2) | Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	5,475	3,365
Significant Observable Inputs (Level 2) | MRB assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Observable Inputs (Level 2) | Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Significant Observable Inputs (Level 2) | RILA, fixed indexed annuity and IUL contracts
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Significant Observable Inputs (Level 2) | Separate account assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	164,802	157,855
Significant Observable Inputs (Level 2) | Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	49	237
Significant Observable Inputs (Level 2) | MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	0	0
Significant Observable Inputs (Level 2) | Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(6,460)	(4,792)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	11,748	10,127
Liabilities	(14,035)	(12,407)
Significant Unobservable Inputs (Level 3) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,581	2,497
Significant Unobservable Inputs (Level 3) | U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Unobservable Inputs (Level 3) | State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	5
Significant Unobservable Inputs (Level 3) | Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Unobservable Inputs (Level 3) | RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	18	13
Significant Unobservable Inputs (Level 3) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	23	8
Significant Unobservable Inputs (Level 3) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,997	1,484
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	50	48
Significant Unobservable Inputs (Level 3) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	273	284
Significant Unobservable Inputs (Level 3) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	38	42
Significant Unobservable Inputs (Level 3) | Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	258	288
Significant Unobservable Inputs (Level 3) | Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	787	622
Significant Unobservable Inputs (Level 3) | Other investments – short-term investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Unobservable Inputs (Level 3) | Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Unobservable Inputs (Level 3) | MRB assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,754	3,894
Significant Unobservable Inputs (Level 3) | Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	2
Liabilities	(344)	(239)
Significant Unobservable Inputs (Level 3) | RILA, fixed indexed annuity and IUL contracts
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	967	940
Liabilities	(11,417)	(9,077)
Significant Unobservable Inputs (Level 3) | Separate account assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	0	0
Significant Unobservable Inputs (Level 3) | Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(204)	(789)
Significant Unobservable Inputs (Level 3) | MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,275)	(1,716)
Significant Unobservable Inputs (Level 3) | Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ (795)	$ (586)