Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ (5,436)	$ (4,645)
Net investment gains (losses)	(375)	(684)
Derivative, Gain (Loss) on Derivative, Net	(181)	(312)
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 979	$ 90
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Derivative Instruments, Net, Pretax	Gain (Loss) on Derivative Instruments, Net, Pretax
Policyholder Benefits and Claims Incurred, Net	$ (10,074)	$ (9,872)
Interest credited to policyholder account balances	(2,290)	(1,864)
Operating Expenses	3,217	3,057
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(25)	(6)
Derivative, Gain (Loss) on Derivative, Net	1,211	403
Operating Expenses	0	0
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(2)	0
Net investment gains (losses)	(4)	(10)
Policyholder Benefits and Claims Incurred, Net	(6)	0
Interest credited to policyholder account balances	(3)	0
Operating Expenses	0	0
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(9)	(15)
Net investment gains (losses)	(15)	2
Derivative, Gain (Loss) on Derivative, Net	0	0
Interest credited to policyholder account balances	0	0
Operating Expenses	0	1
Other Comprehensive Income (Loss), before Tax	16	255
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0
Other Comprehensive Income (Loss), before Tax	180	48
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax		46
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0
Other Comprehensive Income (Loss), before Tax	160
Interest Rate Contract | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(8)	(14)
Net investment gains (losses)	2	5
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	(10)	(19)
Credit forwards [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Net investment gains (losses)	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	0	0
Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(1)	(1)
Net investment gains (losses)	(368)	111
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	0	0
Operating Expenses	0	1
Other Comprehensive Income (Loss), before Tax	367	(113)
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Net investment gains (losses)	4	(10)
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	0	0
Operating Expenses	0	0
Derivative [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	(1)
Net investment gains (losses)	0	0
Policyholder Benefits and Claims Incurred, Net	109	(126)
Interest credited to policyholder account balances	(43)	(36)
Operating Expenses	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(4)	(17)
Net investment gains (losses)	(31)	(3)
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	(24)	0
Operating Expenses	0	0
Debt Securities [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	(1)
Net investment gains (losses)	0	0
Policyholder Benefits and Claims Incurred, Net	103	(126)
Interest credited to policyholder account balances	(42)	(36)
Operating Expenses	0	0
Debt Securities [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(2)	(17)
Net investment gains (losses)	23	3
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	(28)	0
Operating Expenses	0	0
Non-derivative [Domain] [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	20	2
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Net investment gains (losses)	351	(114)
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to policyholder account balances	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	0	0
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
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(123)	(160)
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(218)	547
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Derivative, Gain (Loss) on Derivative, Net	706	162
Credit derivatives — purchased | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Derivative, Gain (Loss) on Derivative, Net	7	13
Credit derivatives — written | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Derivative, Gain (Loss) on Derivative, Net	(34)	(3)
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(25)	(6)
Derivative, Gain (Loss) on Derivative, Net	342	512
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Derivative, Gain (Loss) on Derivative, Net	353	(158)
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0
Derivative, Gain (Loss) on Derivative, Net	(163)	(123)
Net Derivative Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(30)	(43)
Net investment gains (losses)	0	0
Policyholder Benefits and Claims Incurred, Net	4	(5)
Interest credited to policyholder account balances	(49)	(33)
Other Comprehensive Income (Loss), before Tax	0	0
Net Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	32	(17)
Policyholder Benefits and Claims Incurred, Net		0
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(19)	(18)
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(16)	(52)
Net investment gains (losses)	(19)	(8)
Derivative, Gain (Loss) on Derivative, Net	979	90
Policyholder Benefits and Claims Incurred, Net	10	(5)
Interest credited to policyholder account balances	46	33
Operating Expenses	0	1
Other Comprehensive Income (Loss), before Tax	$ 196	$ 303