Fair Value of Financial Instruments - Fair Value Inputs Quantitative Information (Details) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Assets
Fixed maturity available-for-sale securities, at fair value	$ 85,186	$ 81,900
Market risk benefit assets	4,694	4,860
Liabilities
Market risk benefit liabilities	(1,190)	(1,046)
Corporate bonds
Assets
Fixed maturity available-for-sale securities, at fair value	63,466	61,833
CMBS
Assets
Fixed maturity available-for-sale securities, at fair value	2,064	1,583
ABS
Assets
Fixed maturity available-for-sale securities, at fair value	14,595	13,769
Hybrid and redeemable preferred securities
Assets
Fixed maturity available-for-sale securities, at fair value	244	241
Significant Unobservable Inputs (Level 3)
Assets
Equity securities	5	5
Market risk benefit assets	4,694	4,860
Liabilities
Embedded derivative liability	(14,829)	(12,402)
Market risk benefit liabilities	$ (1,190)	$ (1,046)
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment
Assets
Equity securities, measurement input	0.045	0.045
Significant Unobservable Inputs (Level 3) | Minimum | Lapse
Liabilities
Embedded derivative liability, measurement input	0.000	0.000
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment
Assets
Equity securities, measurement input	0.045	0.045
Significant Unobservable Inputs (Level 3) | Maximum | Lapse
Liabilities
Embedded derivative liability, measurement input	0.090	0.090
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Liquidity/Duration Adjustment
Assets
Equity securities, measurement input	0.045	0.045
Significant Unobservable Inputs (Level 3) | Corporate bonds
Assets
Fixed maturity available-for-sale securities, at fair value	$ 246	$ 185
Significant Unobservable Inputs (Level 3) | Corporate bonds | Minimum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.000	0.000
Significant Unobservable Inputs (Level 3) | Corporate bonds | Maximum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.052	0.031
Significant Unobservable Inputs (Level 3) | Corporate bonds | Weighted Average Range | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.020	0.017
Significant Unobservable Inputs (Level 3) | CMBS
Assets
Fixed maturity available-for-sale securities, at fair value	$ 42	$ 8
Significant Unobservable Inputs (Level 3) | CMBS | Minimum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.017	0.019
Significant Unobservable Inputs (Level 3) | CMBS | Maximum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.018	0.019
Significant Unobservable Inputs (Level 3) | CMBS | Weighted Average Range | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.018	0.019
Significant Unobservable Inputs (Level 3) | ABS
Assets
Fixed maturity available-for-sale securities, at fair value	$ 8	$ 10
Significant Unobservable Inputs (Level 3) | ABS | Minimum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.014	0.013
Significant Unobservable Inputs (Level 3) | ABS | Maximum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.014	0.013
Significant Unobservable Inputs (Level 3) | ABS | Weighted Average Range | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.014	0.013
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities
Assets
Fixed maturity available-for-sale securities, at fair value	$ 40	$ 19
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities | Minimum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.010	0.014
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities | Maximum | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.020	0.019
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities | Weighted Average Range | Liquidity/Duration Adjustment
Assets
Fixed maturity AFS and trading securities, measurement input	0.018	0.018
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs
Assets
Market risk benefit assets	$ 17	$ 14
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Minimum | Lapse
Assets
Market risk benefit, measurement input	0.010	0.010
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Minimum | Utilization of GLB Withdrawls
Assets
Market risk benefit, measurement input	0.850	0.850
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Minimum | Claims Utilization Factor
Assets
Market risk benefit, measurement input	0.500	0.600
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Minimum | Premiums Utilization Factor
Assets
Market risk benefit, measurement input	0.800	0.800
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Minimum | Non-Performance Risk
Assets
Market risk benefit, measurement input	0.002	0.003
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Minimum | Volatility
Assets
Market risk benefit, measurement input	0.010	0.010
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Maximum | Lapse
Assets
Market risk benefit, measurement input	0.300	0.300
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Maximum | Utilization of GLB Withdrawls
Assets
Market risk benefit, measurement input	1.000	1.000
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Maximum | Claims Utilization Factor
Assets
Market risk benefit, measurement input	1.000	1.000
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Maximum | Premiums Utilization Factor
Assets
Market risk benefit, measurement input	1.150	1.150
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Maximum | Non-Performance Risk
Assets
Market risk benefit, measurement input	0.018	0.020
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Maximum | Volatility
Assets
Market risk benefit, measurement input	0.270	0.290
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Weighted Average Range | Utilization of GLB Withdrawls
Assets
Market risk benefit, measurement input	0.930	0.920
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Weighted Average Range | Non-Performance Risk
Assets
Market risk benefit, measurement input	0.014	0.016
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs | Weighted Average Range | Volatility
Assets
Market risk benefit, measurement input	0.151	0.145
Significant Unobservable Inputs (Level 3) | Other assets - indexed annuity ceded embedded derivatives
Assets
Embedded derivative asset	$ 2,320	$ 1,970
Significant Unobservable Inputs (Level 3) | Other assets - indexed annuity ceded embedded derivatives | Minimum | Lapse
Assets
Embedded derivative asset, measurement input	0.000	0.000
Significant Unobservable Inputs (Level 3) | Other assets - indexed annuity ceded embedded derivatives | Maximum | Lapse
Assets
Embedded derivative asset, measurement input	0.090	0.090
Significant Unobservable Inputs (Level 3) | Other assets - LPR ceded derivative
Assets
Embedded derivative asset	$ 204	$ 190
Significant Unobservable Inputs (Level 3) | Other assets - LPR ceded derivative | Minimum | Lapse
Assets
Embedded derivative asset, measurement input	0.001	0.001
Significant Unobservable Inputs (Level 3) | Other assets - LPR ceded derivative | Minimum | Non-Performance Risk
Assets
Embedded derivative asset, measurement input	0.002	0.003
Significant Unobservable Inputs (Level 3) | Other assets - LPR ceded derivative | Maximum | Lapse
Assets
Embedded derivative asset, measurement input	0.024	0.020
Significant Unobservable Inputs (Level 3) | Other assets - LPR ceded derivative | Maximum | Non-Performance Risk
Assets
Embedded derivative asset, measurement input	0.018	0.020
Significant Unobservable Inputs (Level 3) | Other assets - LPR ceded derivative | Weighted Average Range | Non-Performance Risk
Assets
Embedded derivative asset, measurement input	0.012	0.014
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs
Liabilities
Market risk benefit liabilities	$ (2,689)	$ (2,763)
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Minimum | Lapse
Assets
Market risk benefit, measurement input	0.010	0.010
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Minimum | Utilization of GLB Withdrawls
Assets
Market risk benefit, measurement input	0.850	0.850
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Minimum | Claims Utilization Factor
Assets
Market risk benefit, measurement input	0.500	0.600
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Minimum | Premiums Utilization Factor
Assets
Market risk benefit, measurement input	0.800	0.800
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Minimum | Non-Performance Risk
Assets
Market risk benefit, measurement input	0.002	0.003
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Minimum | Volatility
Assets
Market risk benefit, measurement input	0.010	0.010
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Maximum | Lapse
Assets
Market risk benefit, measurement input	0.300	0.300
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Maximum | Utilization of GLB Withdrawls
Assets
Market risk benefit, measurement input	1.000	1.000
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Maximum | Claims Utilization Factor
Assets
Market risk benefit, measurement input	1.000	1.000
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Maximum | Premiums Utilization Factor
Assets
Market risk benefit, measurement input	1.150	1.150
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Maximum | Non-Performance Risk
Assets
Market risk benefit, measurement input	0.018	0.020
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Maximum | Volatility
Assets
Market risk benefit, measurement input	0.270	0.290
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Weighted Average Range | Utilization of GLB Withdrawls
Assets
Market risk benefit, measurement input	0.930	0.920
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Weighted Average Range | Non-Performance Risk
Assets
Market risk benefit, measurement input	0.014	0.016
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs | Weighted Average Range | Volatility
Assets
Market risk benefit, measurement input	0.151	0.145