Fair Value of Financial Instruments - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 282,327	$ 269,878
Liabilities	(19,980)	(16,962)
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	68,533	69,657
U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	391	393
State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,743	2,790
Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	263	283
RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,759	1,773
CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,484	1,424
ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	12,349	12,171
Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	242	247
Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,227	2,359
Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	319	306
Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	289	288
Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	15,311	11,496
Other investments – short-term investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	217	233
Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,122	3,365
MRB assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,878	3,894
Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	2
Liabilities	(360)	(239)
RILA, fixed indexed annuity and IUL contracts
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	973	940
Liabilities	(10,896)	(9,077)
Separate account assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	166,225	158,257
Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(355)	(552)
MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,266)	(1,716)
Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(7,103)	(5,378)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	837	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	371	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	12	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	406	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	270,059	258,928
Liabilities	(6,149)	(4,555)
Significant Observable Inputs (Level 2) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	66,044	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	2,743	2,785
Significant Observable Inputs (Level 2) | Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	263	283
Significant Observable Inputs (Level 2) | RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,747	1,760
Significant Observable Inputs (Level 2) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,476	1,416
Significant Observable Inputs (Level 2) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	10,657	10,687
Significant Observable Inputs (Level 2) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	143	153
Significant Observable Inputs (Level 2) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,956	2,075
Significant Observable Inputs (Level 2) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	268	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	14,584	10,874
Significant Observable Inputs (Level 2) | Other investments – short-term investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	217	233
Significant Observable Inputs (Level 2) | Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	4,122	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	165,819	157,855
Significant Observable Inputs (Level 2) | Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	228	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	(6,377)	(4,792)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	11,431	10,127
Liabilities	(13,831)	(12,407)
Significant Unobservable Inputs (Level 3) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,489	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	12	13
Significant Unobservable Inputs (Level 3) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	8	8
Significant Unobservable Inputs (Level 3) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,692	1,484
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	51	48
Significant Unobservable Inputs (Level 3) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	271	284
Significant Unobservable Inputs (Level 3) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	39	42
Significant Unobservable Inputs (Level 3) | Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	289	288
Significant Unobservable Inputs (Level 3) | Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	727	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	4,878	3,894
Significant Unobservable Inputs (Level 3) | Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	2
Liabilities	(360)	(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	973	940
Liabilities	(10,896)	(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	(583)	(789)
Significant Unobservable Inputs (Level 3) | MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,266)	(1,716)
Significant Unobservable Inputs (Level 3) | Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ (726)	$ (586)