Fair Value of Financial Instruments - Quantitative Information of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 1,433	$ 1,312
Liabilities, fair value	5,843	4,661
Market Comparable Company Analysis \| Broker quoted/Market Comparable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	10,301	8,365
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value	$ 5,220	$ 4,258
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Surrender Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0025	0.0025
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Surrender Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.5000	0.7000
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Surrender Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0694	0.0683
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Partial Withdrawal Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0200	0.0200
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Partial Withdrawal Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.3571	0.3448
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Partial Withdrawal Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0272	0.0274
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Non-Performance Spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0048	0.0038
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Non-Performance Spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0095	0.0110
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Non-Performance Spread \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0075	0.0096
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Market Value of Option \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0000	0.0000
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Market Value of Option \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.2081	0.1893
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Market Value of Option \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0292	0.0263
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Swap rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability		0.0384
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Swap rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability		0.0526
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Swap rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability		0.0455
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Mortality Multiplier \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.8000	1.0000
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Mortality Multiplier \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	1.1500	1.0000
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Mortality Multiplier \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	1.0000	1.0000
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Option Cost \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0007	0.0007
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Option Cost \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0570	0.0548
Indexed annuity/ IUL embedded derivatives, included in contractholder funds \| Discounted Cash Flow \| Option Cost \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability	0.0268	0.0238
Asset-backed securities \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 95	$ 57
Asset-backed securities \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0483	0.0509
Asset-backed securities \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0715	0.0695
Asset-backed securities \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0633	0.0600
Corporates \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 750	$ 787
Corporates \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0200	0.0000
Corporates \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.2253	0.1287
Corporates \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0676	0.0691
Corporates \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 7	$ 8
Corporates \| Discounted Cash Flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.1333	0.4400
Corporates \| Discounted Cash Flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0000	1.0000
Corporates \| Discounted Cash Flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9645	0.7520
Municipals \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value		$ 32
Municipals \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities		0.0625
Municipals \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities		0.0625
Municipals \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities		0.0625
Residential mortgage-backed securities \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 3	$ 3
Residential mortgage-backed securities \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0589	0.0546
Residential mortgage-backed securities \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0589	0.0546
Residential mortgage-backed securities \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0589	0.0546
Foreign Governments \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 4	$ 16
Foreign Governments \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.1214	0.0694
Foreign Governments \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.1214	0.0768
Foreign Governments \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.1214	0.0745
Investment in unconsolidated affiliates \| Market Comparable Company Analysis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 272	$ 285
Investment in unconsolidated affiliates \| Market Comparable Company Analysis \| EBITDA Multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated affiliate	8.7	0.044
Investment in unconsolidated affiliates \| Market Comparable Company Analysis \| EBITDA Multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated affiliate	23.6	0.318
Investment in unconsolidated affiliates \| Market Comparable Company Analysis \| EBITDA Multiple \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated affiliate	14.6	0.232
Preferred securities \| Affiliate \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 1	$ 1
Preferred securities \| Affiliate \| Discounted Cash Flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities		1.0000
Preferred securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	1.0000
Preferred securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	1.0000
Preferred securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	1.0000
Equity securities \| Market Comparable Company Analysis \| EBITDA Multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	5.8
Equity securities \| Market Comparable Company Analysis \| EBITDA Multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	7.5
Equity securities \| Market Comparable Company Analysis \| EBITDA Multiple \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	7.0
Equity securities \| Affiliate \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 4	$ 7
Equity securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	0.0480	0.1150
Equity securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	0.1410	0.1150
Equity securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity / Preferred securities	0.0940	0.1150
Other assets \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 65
Other assets \| Discounted Cash Flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other assets	0.1060
Other assets \| Discounted Cash Flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other assets	0.1200
Other assets \| Discounted Cash Flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other assets	0.1130
Other assets \| Discounted Cash Flow \| Conditional Prepayment Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other assets	0.0624
Other assets \| Discounted Cash Flow \| Conditional Prepayment Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other assets	0.1199
Other assets \| Discounted Cash Flow \| Conditional Prepayment Rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other assets	0.0912
Available-for-sale embedded derivative \| Black Scholes model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 32	$ 28
Available-for-sale embedded derivative \| Black Scholes model \| Market Value of AnchorPath Fund
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative asset	1.0000	1
Loan receivable \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 11
Loan receivable \| Discounted Cash Flow \| Risk-Adjusted Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable	0.0722
Loan receivable \| Discounted Cash Flow \| Risk-Adjusted Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable	0.0722
Loan receivable \| Discounted Cash Flow \| Risk-Adjusted Discount Rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable	0.0722
Loan receivable \| Discounted Cash Flow \| Collateral Volatility \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable	0.3500
Loan receivable \| Discounted Cash Flow \| Collateral Volatility \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable	0.3500
Loan receivable \| Discounted Cash Flow \| Collateral Volatility \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable	0.3500
Market risk benefits asset \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 189	$ 88
Market risk benefits asset \| Discounted Cash Flow \| Mortality \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.8000	1.0000
Market risk benefits asset \| Discounted Cash Flow \| Mortality \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.1500	1.0000
Market risk benefits asset \| Discounted Cash Flow \| Mortality \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market risk benefits asset \| Discounted Cash Flow \| Surrender Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0025	0.0025
Market risk benefits asset \| Discounted Cash Flow \| Surrender Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.3000	0.1000
Market risk benefits asset \| Discounted Cash Flow \| Surrender Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0505	0.0522
Market risk benefits asset \| Discounted Cash Flow \| Partial Withdrawal Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0200	0.0000
Market risk benefits asset \| Discounted Cash Flow \| Partial Withdrawal Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.2439	0.2326
Market risk benefits asset \| Discounted Cash Flow \| Partial Withdrawal Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0248	0.0250
Market risk benefits asset \| Discounted Cash Flow \| Non-Performance Spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0048	0.0038
Market risk benefits asset \| Discounted Cash Flow \| Non-Performance Spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0095	0.0110
Market risk benefits asset \| Discounted Cash Flow \| Non-Performance Spread \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0075	0.0096
Market risk benefits asset \| Discounted Cash Flow \| GMWB Utilization \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.5000	0.5000
Market risk benefits asset \| Discounted Cash Flow \| GMWB Utilization \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.7500	0.6000
Market risk benefits asset \| Discounted Cash Flow \| GMWB Utilization \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.6177	0.5081
Contingent consideration \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value	$ 74
Contingent consideration \| Discounted Cash Flow \| Risk-Adjusted Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.1350
Contingent consideration \| Discounted Cash Flow \| Risk-Adjusted Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.1350
Contingent consideration \| Discounted Cash Flow \| Risk-Adjusted Discount Rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.1350
Contingent consideration \| Discounted Cash Flow \| EBITDA Volatility \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.35
Contingent consideration \| Discounted Cash Flow \| EBITDA Volatility \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.35
Contingent consideration \| Discounted Cash Flow \| EBITDA Volatility \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.35
Contingent consideration \| Discounted Cash Flow \| Counterparty Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.0650
Contingent consideration \| Discounted Cash Flow \| Counterparty Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.0650
Contingent consideration \| Discounted Cash Flow \| Counterparty Discount Rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration	0.0650
Market risk benefits liability \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value	$ 549	$ 403
Market risk benefits liability \| Discounted Cash Flow \| Mortality \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.8000	1.0000
Market risk benefits liability \| Discounted Cash Flow \| Mortality \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.1500	1.0000
Market risk benefits liability \| Discounted Cash Flow \| Mortality \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market risk benefits liability \| Discounted Cash Flow \| Surrender Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0025	0.0025
Market risk benefits liability \| Discounted Cash Flow \| Surrender Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.3000	0.1000
Market risk benefits liability \| Discounted Cash Flow \| Surrender Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0505	0.0522
Market risk benefits liability \| Discounted Cash Flow \| Partial Withdrawal Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0200	0.0000
Market risk benefits liability \| Discounted Cash Flow \| Partial Withdrawal Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.2439	0.2326
Market risk benefits liability \| Discounted Cash Flow \| Partial Withdrawal Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0248	0.0250
Market risk benefits liability \| Discounted Cash Flow \| Non-Performance Spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0048	0.0038
Market risk benefits liability \| Discounted Cash Flow \| Non-Performance Spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0095	0.0110
Market risk benefits liability \| Discounted Cash Flow \| Non-Performance Spread \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0075	0.0096
Market risk benefits liability \| Discounted Cash Flow \| GMWB Utilization \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.5000	0.5000
Market risk benefits liability \| Discounted Cash Flow \| GMWB Utilization \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.7500	0.6000
Market risk benefits liability \| Discounted Cash Flow \| GMWB Utilization \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.6177	0.5081

Fair Value of Financial Instruments - Quantitative Information of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Details)
$ in Millions