Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ (5,072)	$ (3,583)	$ (9,717)	$ (7,867)
Net investment gains (losses)	(1,039)	(682)	(1,723)	(1,199)
Derivative, Gain (Loss) on Derivative, Net	997	970	1,087	1,921
Gain (Loss) on Derivative Instruments, Net, Pretax	997	970	1,087	1,921
Policyholder Benefits and Claims Incurred, Net	(11,809)	(11,615)	(21,681)	(22,789)
Interest credited to policyholder account balances	(1,933)	(527)	(3,797)	(1,153)
Operating Expenses	3,133	2,908	6,190	5,860
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(36)	39	(42)	(50)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	1,257	1,382	1,660	2,466
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	2	1	2	(1)
Net investment gains (losses)	(2)	23	(12)	55
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(14)	(18)	(14)	(33)
Interest credited to policyholder account balances	(1)	(3)	(1)	(5)
Operating Expenses	0	0	0	0
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(14)	(17)	(29)	(34)
Net investment gains (losses)	79	34	81	50
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	2	1	3
Other Comprehensive Income (Loss), before Tax	(737)	475	(482)	275
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	185	205	233	267
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax				211
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	160	168	206
Interest Rate Contract | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(13)	(16)	(27)	(31)
Net investment gains (losses)	55	42	60	60
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	1	0	2
Other Comprehensive Income (Loss), before Tax	(68)	(59)	(87)	(93)
Credit forwards [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	0	0
Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(1)	(1)	(2)	(3)
Net investment gains (losses)	200	(690)	311	(838)
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	1	1	1
Other Comprehensive Income (Loss), before Tax	(201)	688	(314)	834
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	10	28	0	61
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Derivative [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	3	(1)	(7)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	135	324	9	696
Interest credited to policyholder account balances	(35)	(94)	(1)	(174)
Operating Expenses	0	0	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(5)	61	(22)	(93)
Net investment gains (losses)	(51)	(170)	(54)	(251)
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	(13)	0	(13)	0
Operating Expenses	0	0	0	0
Debt Securities [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	1	4	0	(8)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	121	306	(5)	663
Interest credited to policyholder account balances	(34)	(91)	(2)	(169)
Operating Expenses	0	0	0	0
Debt Securities [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(4)	61	(21)	(91)
Net investment gains (losses)	39	165	42	245
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	(11)	0	(11)	0
Operating Expenses	0	0	0	0
Non-derivative [Domain] [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	25	37	27	56
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	(176)	682	(290)	828
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	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	(1)	0	(1)
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(262)	749	(422)	1,201
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(205)	(903)	342	(1,667)
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	(1)	0	(2)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	800	665	962	740
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Credit derivatives — purchased | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	18	(46)	31	(92)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Credit derivatives — written | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(85)	196	(88)	245
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(36)	36	(42)	(45)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	409	(778)	921	(1,020)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	(2)	0	(3)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	434	1,521	276	2,887
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(319)	(176)	(442)	(294)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	0	0	0	0
Net Derivative Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(32)	(140)	(75)	(223)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(260)	(252)	(572)	(488)
Policyholder Benefits and Claims Incurred, Net	(3)	(36)	(8)	(76)
Interest credited to policyholder account balances	(34)	(28)	(68)	(54)
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	0	0
Net Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(18)	160	(35)	57
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(18)	0	(36)	0
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(8)	(195)	(60)	(308)
Net investment gains (losses)	77	57	69	105
Policyholder Benefits and Claims Incurred, Net	11	(18)	6	(43)
Interest credited to policyholder account balances	33	31	67	59
Operating Expenses	0	2	1	3
Other Comprehensive Income (Loss), before Tax	$ (552)	$ 680	$ (249)	$ 542