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Derivatives Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income $ 19,908,000,000 $ 15,916,000,000 $ 21,395,000,000
Net investment gains (losses) (2,824,000,000) (1,260,000,000) 1,543,000,000
Policyholder benefits and claims (44,590,000,000) (49,507,000,000) (43,118,000,000)
Gain (Loss) on Derivative Instruments, Net, Pretax (2,140,000,000) (2,251,000,000) (3,257,000,000)
Policyholder Account Balance, Interest Expense (7,860,000,000) (3,894,000,000) (5,571,000,000)
Operating Expenses 12,710,000,000 11,859,000,000 12,018,000,000
Other Comprehensive Income (Loss), before Tax 4,259,000,000 (25,956,000,000) (3,282,000,000)
Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 1,000,000 1,000,000 6,000,000
Net investment gains (losses) (28,000,000) 43,000,000 (6,000,000)
Policyholder benefits and claims (26,000,000) (54,000,000) 45,000,000
Policyholder Account Balance, Interest Expense (6,000,000) (5,000,000) (5,000,000)
Operating Expenses 0 0 0
Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0 0
Net investment income 54,000,000 65,000,000 64,000,000
Net investment gains (losses) 102,000,000 19,000,000 82,000,000
Policyholder Account Balance, Interest Expense 0 0 0
Operating Expenses 2,000,000 5,000,000 5,000,000
Other Comprehensive Income (Loss), before Tax (1,811,000,000) (85,000,000) 137,000,000
Net Investment Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment gains (losses) 5,000,000    
Other Comprehensive Income (Loss), before Tax 246,000,000 132,000,000 139,000,000
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax   85,000,000 97,000,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment gains (losses) 5,000,000    
Other Comprehensive Income (Loss), before Tax 226,000,000    
Interest rate contracts | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0 0
Net investment income 50,000,000 59,000,000 56,000,000
Net investment gains (losses) 90,000,000 41,000,000 84,000,000
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense 0 0 0
Operating Expenses 0 4,000,000 3,000,000
Other Comprehensive Income (Loss), before Tax (140,000,000) (104,000,000) (143,000,000)
Credit forwards [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0 0
Net investment income 0 0 0
Net investment gains (losses) 1,000,000 0 0
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense 0 0 0
Operating Expenses 0 0 0
Other Comprehensive Income (Loss), before Tax (1,000,000) 0 0
Currency Swap [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0 0
Net investment income 4,000,000 6,000,000 8,000,000
Net investment gains (losses) 558,000,000 (609,000,000) (403,000,000)
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense 0 0 0
Operating Expenses 2,000,000 1,000,000 2,000,000
Other Comprehensive Income (Loss), before Tax (564,000,000) 602,000,000 393,000,000
Derivative [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 0 0 0
Net investment gains (losses) (20,000,000) 46,000,000 0
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense 0 0 0
Operating Expenses 0 0 0
Derivative [Member] | Interest rate swaps | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 3,000,000 9,000,000 6,000,000
Net investment gains (losses) 0 0 0
Policyholder benefits and claims 0 959,000,000 373,000,000
Policyholder Account Balance, Interest Expense (29,000,000) (254,000,000) (83,000,000)
Operating Expenses 0 0 0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 39,000,000 109,000,000 50,000,000
Net investment gains (losses) (41,000,000) (220,000,000) (191,000,000)
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense (20,000,000) 0 0
Operating Expenses 0 0 0
Fixed Maturity Securities | Interest rate swaps | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 3,000,000 9,000,000 6,000,000
Net investment gains (losses) 0 0 0
Policyholder benefits and claims (26,000,000) 905,000,000 (328,000,000)
Policyholder Account Balance, Interest Expense (31,000,000) (249,000,000) (78,000,000)
Operating Expenses 0 0 0
Fixed Maturity Securities | Currency Swap [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 38,000,000 110,000,000 44,000,000
Net investment gains (losses) 33,000,000 217,000,000 185,000,000
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense (24,000,000) 0 0
Operating Expenses 0 0 0
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 0 0 0
Net investment income 0 0 0
Net investment gains (losses) (547,000,000) 587,000,000 401,000,000
Policyholder benefits and claims 0 0 0
Policyholder Account Balance, Interest Expense 0 0 0
Operating Expenses 0 0 0
Other Comprehensive Income (Loss), before Tax 0 0 0
Non-derivative [Domain] [Member] | Net Investment Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax 20,000,000 47,000,000 42,000,000
Accumulated Other Comprehensive Income (Loss) | Credit forwards [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax 0 0 (14,000,000)
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax (1,215,000,000) 1,784,000,000 500,000,000
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax 109,000,000 (2,367,000,000) (599,000,000)
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 3,234,000,000 3,401,000,000 4,305,000,000
Net investment income 52,000,000 50,000,000 54,000,000
Operating Expenses 0   0
Not Designated as Hedging Instrument [Member] | Nonoperating Income (Expense) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Operating Expenses   0  
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 1,443,000,000 372,000,000 983,000,000
Net investment income 0 2,000,000 0
Credit derivatives — purchased | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 17,000,000 (75,000,000) (9,000,000)
Net investment income 0 0 0
Credit derivatives — written | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (135,000,000) 92,000,000 (41,000,000)
Net investment income 0 0 0
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 1,296,000,000 (673,000,000) 1,580,000,000
Net investment income 52,000,000 45,000,000 56,000,000
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (366,000,000) (282,000,000) (249,000,000)
Net investment income 0 0 0
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net 979,000,000 3,967,000,000 2,041,000,000
Net investment income 0 3,000,000 2,000,000
Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 178,000,000 376,000,000 151,000,000
Net investment gains (losses) 0 0 0
Policyholder benefits and claims (4,000,000) (112,000,000) (166,000,000)
Gain (Loss) on Derivative Instruments, Net, Pretax 1,055,000,000 1,029,000,000 993,000,000
Policyholder Account Balance, Interest Expense (149,000,000) (120,000,000) (121,000,000)
Other Comprehensive Income (Loss), before Tax 0 0 0
Net Embedded Derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Policyholder benefits and claims     0
Gain (Loss) on Derivative Instruments, Net, Pretax (36,000,000) 121,000,000 55,000,000
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on Derivative Instruments, Net, Pretax 75,000,000 0 0
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment income 179,000,000 490,000,000 167,000,000
Net investment gains (losses) 79,000,000 62,000,000 76,000,000
Policyholder benefits and claims 22,000,000 (58,000,000) (121,000,000)
Policyholder Account Balance, Interest Expense 155,000,000 125,000,000 126,000,000
Operating Expenses 2,000,000 5,000,000 5,000,000
Other Comprehensive Income (Loss), before Tax $ (1,565,000,000) $ 47,000,000 $ 276,000,000