Derivatives Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ 21,273,000,000	$ 19,908,000,000	$ 15,916,000,000
Net investment gains (losses)	(1,184,000,000)	(2,824,000,000)	(1,260,000,000)
Net derivative gains (losses)	(1,623,000,000)	(2,140,000,000)	(2,251,000,000)
Policyholder benefits and claims	(44,728,000,000)	(44,590,000,000)	(49,507,000,000)
Policyholder Account Balance, Interest Expense	8,339,000,000	7,860,000,000	3,894,000,000
Operating Expenses	13,017,000,000	12,710,000,000	11,859,000,000
Other Comprehensive Income (Loss), before Tax	(2,293,000,000)	4,259,000,000	(25,956,000,000)
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	1,000,000	1,000,000	1,000,000
Net investment gains (losses)	(18,000,000)	(28,000,000)	43,000,000
Policyholder benefits and claims	(26,000,000)	(26,000,000)	54,000,000
Policyholder Account Balance, Interest Expense	5,000,000	6,000,000	5,000,000
Operating Expenses	0	0	0
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	37,000,000	54,000,000	65,000,000
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Net investment gains (losses)	(9,000,000)	102,000,000	19,000,000
Policyholder Account Balance, Interest Expense	0	0	0
Operating Expenses	1,000,000	2,000,000	5,000,000
Other Comprehensive Income (Loss), before Tax	191,000,000	(1,811,000,000)	(85,000,000)
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	5,000,000	0
Other Comprehensive Income (Loss), before Tax	426,000,000	246,000,000	132,000,000
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax		226,000,000	85,000,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	5,000,000	0
Other Comprehensive Income (Loss), before Tax	395,000,000
Interest rate contracts | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	33,000,000	50,000,000	59,000,000
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Net investment gains (losses)	(5,000,000)	90,000,000	41,000,000
Policyholder benefits and claims	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0
Operating Expenses	0	0	4,000,000
Other Comprehensive Income (Loss), before Tax	(28,000,000)	(140,000,000)	(104,000,000)
Credit forwards [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Net investment gains (losses)	1,000,000	1,000,000	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)	(1,000,000)	0
Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	4,000,000	4,000,000	6,000,000
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Net investment gains (losses)	(794,000,000)	558,000,000	(609,000,000)
Policyholder benefits and claims	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0
Operating Expenses	1,000,000	2,000,000	1,000,000
Other Comprehensive Income (Loss), before Tax	789,000,000	(564,000,000)	602,000,000
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0
Net investment gains (losses)	(6,000,000)	(20,000,000)	46,000,000
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	0	3,000,000	9,000,000
Net investment gains (losses)	0	0	0
Policyholder benefits and claims	176,000,000	0	959,000,000
Policyholder Account Balance, Interest Expense	59,000,000	29,000,000	254,000,000
Operating Expenses	0	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	2,000,000	39,000,000	109,000,000
Net investment gains (losses)	(44,000,000)	(41,000,000)	(220,000,000)
Policyholder benefits and claims	0	0	0
Policyholder Account Balance, Interest Expense	90,000,000	20,000,000	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	0	3,000,000	9,000,000
Net investment gains (losses)	0	0	0
Policyholder benefits and claims	150,000,000	(26,000,000)	(905,000,000)
Policyholder Account Balance, Interest Expense	54,000,000	31,000,000	249,000,000
Operating Expenses	0	0	0
Fixed Maturity Securities | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	1,000,000	38,000,000	110,000,000
Net investment gains (losses)	32,000,000	33,000,000	217,000,000
Policyholder benefits and claims	0	0	0
Policyholder Account Balance, Interest Expense	90,000,000	24,000,000	0
Operating Expenses	0	0	0
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Net investment gains (losses)	789,000,000	(547,000,000)	587,000,000
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	31,000,000	20,000,000	47,000,000
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	0
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(95,000,000)	(1,215,000,000)	1,784,000,000
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(474,000,000)	109,000,000	(2,367,000,000)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	56,000,000	52,000,000	50,000,000
Derivative, Gain (Loss) on Derivative, Net	2,414,000,000	3,234,000,000	3,401,000,000
Operating Expenses	0		0
Not Designated as Hedging Instrument [Member] | Nonoperating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Operating Expenses		0
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	3,000,000
Derivative, Gain (Loss) on Derivative, Net	794,000,000	979,000,000	3,967,000,000
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	2,000,000
Derivative, Gain (Loss) on Derivative, Net	1,328,000,000	1,443,000,000	372,000,000
Credit derivatives — purchased | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(3,000,000)	17,000,000	(75,000,000)
Credit derivatives — written | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(47,000,000)	(135,000,000)	92,000,000
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	56,000,000	52,000,000	45,000,000
Derivative, Gain (Loss) on Derivative, Net	519,000,000	1,296,000,000	(673,000,000)
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(177,000,000)	(366,000,000)	(282,000,000)
Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	196,000,000	178,000,000	376,000,000
Net investment gains (losses)	0	0	0
Net derivative gains (losses)	629,000,000	1,055,000,000	1,029,000,000
Policyholder benefits and claims	11,000,000	(4,000,000)	(112,000,000)
Policyholder Account Balance, Interest Expense	180,000,000	149,000,000	120,000,000
Other Comprehensive Income (Loss), before Tax	0	0	0
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	76,000,000	75,000,000	0
Net Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	110,000,000	(36,000,000)	121,000,000
Embedded derivatives - other
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	(24,000,000)
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	178,000,000	179,000,000	490,000,000
Net investment gains (losses)	(27,000,000)	79,000,000	62,000,000
Net derivative gains (losses)		(2,140,000,000)
Policyholder benefits and claims	37,000,000	22,000,000	(58,000,000)
Policyholder Account Balance, Interest Expense	(185,000,000)	(155,000,000)	(125,000,000)
Operating Expenses	1,000,000	2,000,000	5,000,000
Other Comprehensive Income (Loss), before Tax	$ 617,000,000	$ (1,565,000,000)	$ 47,000,000