Fair Value of Financial Instruments - Fair Value Inputs Quantitative Information (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Assets
Fixed maturity available-for-sale securities, at fair value	$ 87,111	$ 88,738
Market risk benefit assets	4,860	3,894
Liabilities
Market risk benefit liabilities	(1,046)	(1,716)
Corporate bonds
Assets
Fixed maturity available-for-sale securities, at fair value	66,450	69,657
State and municipal bonds
Assets
Fixed maturity available-for-sale securities, at fair value	2,371	2,790
Foreign government bonds
Assets
Fixed maturity available-for-sale securities, at fair value	237	283
ABS
Assets
Fixed maturity available-for-sale securities, at fair value	13,880	12,171
CMBS
Assets
Fixed maturity available-for-sale securities, at fair value	1,665	1,424
Hybrid and redeemable preferred securities
Assets
Fixed maturity available-for-sale securities, at fair value	254	247
Significant Unobservable Inputs (Level 3)
Assets
Equity securities	5	5
Market risk benefit assets	4,860	3,894
Embedded derivative asset	1,115	940
Liabilities
Embedded derivative liability	(12,402)	(9,013)
Market risk benefit liabilities	(1,046)	(1,716)
Significant Unobservable Inputs (Level 3) | Corporate bonds
Assets
Fixed maturity available-for-sale securities, at fair value	187	186
Significant Unobservable Inputs (Level 3) | State and municipal bonds
Assets
Fixed maturity available-for-sale securities, at fair value		5
Significant Unobservable Inputs (Level 3) | Foreign government bonds
Assets
Fixed maturity available-for-sale securities, at fair value		12
Significant Unobservable Inputs (Level 3) | ABS
Assets
Fixed maturity available-for-sale securities, at fair value	10
Significant Unobservable Inputs (Level 3) | CMBS
Assets
Fixed maturity available-for-sale securities, at fair value	8	8
Significant Unobservable Inputs (Level 3) | Hybrid and redeemable preferred securities
Assets
Fixed maturity available-for-sale securities, at fair value	19	7
Significant Unobservable Inputs (Level 3) | Other assets – ceded MRBs
Assets
Market risk benefit assets	2	2
Significant Unobservable Inputs (Level 3) | Other liabilities – ceded MRBs
Liabilities
Market risk benefit liabilities	$ (381)	$ (239)
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment
Assets
Equity securities, measurement input	0.045	0.045
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment | Corporate bonds
Assets
Fixed maturity AFS and trading securities, measurement input	0	(0.002)
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment | State and municipal bonds
Assets
Fixed maturity AFS and trading securities, measurement input		0.009
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment | Foreign government bonds
Assets
Fixed maturity AFS and trading securities, measurement input		0.018
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment | ABS
Assets
Fixed maturity AFS and trading securities, measurement input	0.013
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment | CMBS
Assets
Fixed maturity AFS and trading securities, measurement input	0.019	0.023
Significant Unobservable Inputs (Level 3) | Minimum | Liquidity/Duration Adjustment | Hybrid and redeemable preferred securities
Assets
Fixed maturity AFS and trading securities, measurement input	0.014	0.014
Significant Unobservable Inputs (Level 3) | Minimum | Lapse
Assets
Embedded derivative asset, measurement input	0	0
Liabilities
Embedded derivative liability, measurement input	0	0
Significant Unobservable Inputs (Level 3) | Minimum | Lapse | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.01	0.01
Significant Unobservable Inputs (Level 3) | Minimum | Lapse | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.01	0.01
Significant Unobservable Inputs (Level 3) | Minimum | Utilization of GLB Withdrawls | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.85	0.85
Significant Unobservable Inputs (Level 3) | Minimum | Utilization of GLB Withdrawls | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.85	0.85
Significant Unobservable Inputs (Level 3) | Minimum | Claims Utilization Factor | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.60	0.60
Significant Unobservable Inputs (Level 3) | Minimum | Claims Utilization Factor | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.60	0.60
Significant Unobservable Inputs (Level 3) | Minimum | Premiums Utilization Factor | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.80	0.80
Significant Unobservable Inputs (Level 3) | Minimum | Premiums Utilization Factor | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.80	0.80
Significant Unobservable Inputs (Level 3) | Minimum | Non-Performance Risk | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.0025	0.0051
Significant Unobservable Inputs (Level 3) | Minimum | Non-Performance Risk | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.0025	0.0051
Significant Unobservable Inputs (Level 3) | Minimum | Volatility | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.01	0.01
Significant Unobservable Inputs (Level 3) | Minimum | Volatility | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.01	0.01
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment
Assets
Equity securities, measurement input	0.045	0.045
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment | Corporate bonds
Assets
Fixed maturity AFS and trading securities, measurement input	0.031	0.037
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment | State and municipal bonds
Assets
Fixed maturity AFS and trading securities, measurement input		0.022
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment | Foreign government bonds
Assets
Fixed maturity AFS and trading securities, measurement input		0.018
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment | ABS
Assets
Fixed maturity AFS and trading securities, measurement input	0.013
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment | CMBS
Assets
Fixed maturity AFS and trading securities, measurement input	0.019	0.023
Significant Unobservable Inputs (Level 3) | Maximum | Liquidity/Duration Adjustment | Hybrid and redeemable preferred securities
Assets
Fixed maturity AFS and trading securities, measurement input	0.019	0.015
Significant Unobservable Inputs (Level 3) | Maximum | Lapse
Assets
Embedded derivative asset, measurement input	0.09	0.09
Liabilities
Embedded derivative liability, measurement input	0.09	0.09
Significant Unobservable Inputs (Level 3) | Maximum | Lapse | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.30	0.30
Significant Unobservable Inputs (Level 3) | Maximum | Lapse | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.30	0.30
Significant Unobservable Inputs (Level 3) | Maximum | Utilization of GLB Withdrawls | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	1	1
Significant Unobservable Inputs (Level 3) | Maximum | Utilization of GLB Withdrawls | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	1	1
Significant Unobservable Inputs (Level 3) | Maximum | Claims Utilization Factor | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	1	1
Significant Unobservable Inputs (Level 3) | Maximum | Claims Utilization Factor | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	1	1
Significant Unobservable Inputs (Level 3) | Maximum | Premiums Utilization Factor | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	1.15	1.15
Significant Unobservable Inputs (Level 3) | Maximum | Premiums Utilization Factor | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	1.15	1.15
Significant Unobservable Inputs (Level 3) | Maximum | Non-Performance Risk | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.0200	0.0213
Significant Unobservable Inputs (Level 3) | Maximum | Non-Performance Risk | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.0200	0.0213
Significant Unobservable Inputs (Level 3) | Maximum | Volatility | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.29	0.29
Significant Unobservable Inputs (Level 3) | Maximum | Volatility | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.29	0.29
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) | Weighted Average Range | Liquidity/Duration Adjustment | Corporate bonds
Assets
Fixed maturity AFS and trading securities, measurement input	0.017	0.021
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Liquidity/Duration Adjustment | State and municipal bonds
Assets
Fixed maturity AFS and trading securities, measurement input		0.021
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Liquidity/Duration Adjustment | Foreign government bonds
Assets
Fixed maturity AFS and trading securities, measurement input		0.018
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Liquidity/Duration Adjustment | ABS
Assets
Fixed maturity AFS and trading securities, measurement input	0.013
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Liquidity/Duration Adjustment | CMBS
Assets
Fixed maturity AFS and trading securities, measurement input	0.019	0.023
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Liquidity/Duration Adjustment | Hybrid and redeemable preferred securities
Assets
Fixed maturity AFS and trading securities, measurement input	0.018	0.015
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Utilization of GLB Withdrawls | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.92	0.94
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Utilization of GLB Withdrawls | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.92	0.94
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Non-Performance Risk | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.0158	0.0178
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Non-Performance Risk | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.0158	0.0178
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Volatility | Other assets – ceded MRBs
Assets
Market risk benefit, measurement input	0.1450	0.1392
Significant Unobservable Inputs (Level 3) | Weighted Average Range | Volatility | Other liabilities – ceded MRBs
Assets
Market risk benefit, measurement input	0.1450	0.1392