Fair Value of Financial Instruments - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 269,878	$ 261,099
Liabilities	(16,962)	(9,919)
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	69,657	79,023
U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	393	379
State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,790	5,070
Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	283	318
RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,773	2,009
CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,424	1,674
ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	12,171	10,904
Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	247	359
Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,359	3,498
Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	306	427
Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	288	487
Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	11,496	6,653
Other investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	233	75
Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	3,365	3,343
MRB assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	3,894	2,807
Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	12
Liabilities	(239)	(205)
Indexed annuity ceded embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	940	525
Liabilities	(9,077)	(4,783)
Separate account assets
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	158,257	143,536
Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(552)	416
MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,716)	(2,078)
Derivative Liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(5,378)	(3,269)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	823	812
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	374	359
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	46	41
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	1	0
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
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) | Indexed annuity ceded embedded derivatives
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	402	412
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	258,928	251,620
Liabilities	(4,555)	(2,250)
Significant Observable Inputs (Level 2) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	67,160	76,728
Significant Observable Inputs (Level 2) | U.S. government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	19	20
Significant Observable Inputs (Level 2) | State and municipal bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,785	5,035
Significant Observable Inputs (Level 2) | Foreign government bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	283	318
Significant Observable Inputs (Level 2) | RMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,760	2,008
Significant Observable Inputs (Level 2) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,416	1,674
Significant Observable Inputs (Level 2) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	10,687	9,787
Significant Observable Inputs (Level 2) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	153	269
Significant Observable Inputs (Level 2) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,075	2,917
Significant Observable Inputs (Level 2) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	263	274
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	10,874	6,048
Significant Observable Inputs (Level 2) | Other investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	233	75
Significant Observable Inputs (Level 2) | Cash and invested cash
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	3,365	3,343
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) | Indexed annuity ceded embedded derivatives
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	157,855	143,124
Significant Observable Inputs (Level 2) | Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	237	416
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	(4,792)	(2,666)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	10,127	8,667
Liabilities	(12,407)	(7,669)
Significant Unobservable Inputs (Level 3) | Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2,497	2,295
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	5	35
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	13	1
Significant Unobservable Inputs (Level 3) | CMBS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	8	0
Significant Unobservable Inputs (Level 3) | ABS
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	1,484	1,117
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	48	49
Significant Unobservable Inputs (Level 3) | Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	284	581
Significant Unobservable Inputs (Level 3) | Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	42	153
Significant Unobservable Inputs (Level 3) | Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	288	487
Significant Unobservable Inputs (Level 3) | Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	622	605
Significant Unobservable Inputs (Level 3) | Other 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	3,894	2,807
Significant Unobservable Inputs (Level 3) | Ceded MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	2	12
Liabilities	(239)	(205)
Significant Unobservable Inputs (Level 3) | Indexed annuity ceded embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	940	525
Liabilities	(9,077)	(4,783)
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	(789)	0
Significant Unobservable Inputs (Level 3) | MRB liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	(1,716)	(2,078)
Significant Unobservable Inputs (Level 3) | Derivative Liabilities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ (586)	$ (603)