Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ 3,583	$ 5,280	$ 7,867	$ 10,594
Net investment gains (losses)	(685)	1,605	(1,203)	1,739
Derivative, Gain (Loss) on Derivative, Net	(1,195)	421	(2,054)	(1,814)
Policyholder Benefits and Claims Incurred, Net	(11,790)	(9,405)	(22,983)	(19,928)
Interest credited to policyholder account balances	(492)	(1,515)	(1,122)	(2,866)
Operating Expenses	3,083	2,881	6,103	6,031
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	39	(15)	50	(30)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(1,541)	180	(2,677)	(2,980)
Policyholder Benefits and Claims Incurred, Net	(159)	95	(211)	(243)
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	(1)	1	1	2
Net investment gains (losses)	23	(2)	55	(9)
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(20)	(5)	(37)	(34)
Interest credited to policyholder account balances	(1)	0	(1)	0
Operating Expenses	0	0	0	0
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	17	16	34	31
Net investment gains (losses)	34	19	50	40
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Interest credited to policyholder account balances	0	0	0	0
Operating Expenses	2	1	3	2
Other Comprehensive Income (Loss), before Tax	475	697	275	(571)
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	205	19	267	75
Nonperformance Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	18	(8)	4	(51)
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]
Other Comprehensive Income (Loss), before Tax	168	17	211
Interest Rate Contract | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	16	15	31	27
Net investment gains (losses)	42	19	60	48
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	1	0	2	1
Other Comprehensive Income (Loss), before Tax	(59)	(34)	(93)	(76)
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	3	4
Net investment gains (losses)	(690)	95	(838)	(124)
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	1	1	1	1
Other Comprehensive Income (Loss), before Tax	688	(97)	834	119
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	28	(2)	61	(4)
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	3	0	7	3
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	408	(237)	860	365
Interest credited to policyholder account balances	(10)	0	(10)	0
Operating Expenses	0	0	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	61	(1)	93	12
Net investment gains (losses)	(170)	(7)	(251)	(135)
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
Debt Securities [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(4)	1	(8)	(2)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	388	(242)	823	331
Interest credited to policyholder account balances	(9)	0	(9)	0
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	(61)	1	(91)	(11)
Net investment gains (losses)	165	7	245	130
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
Non-derivative [Domain] [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	37	2	56	29
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)	682	(95)	828	116
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	0	(4)	0	(72)
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	749	322	1,201	169
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(903)	510	(1,667)	(711)
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	1	0	2	0
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(664)	(123)	(738)	(606)
Policyholder Benefits and Claims Incurred, Net	(1)	0	(2)	3
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	46	(7)	92	12
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	(195)	30	(245)	35
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	(15)	45	(32)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	590	(363)	751	(1,039)
Policyholder Benefits and Claims Incurred, Net	(187)	103	(269)	(207)
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	2	0	3	2
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(1,494)	636	(2,831)	(1,614)
Policyholder Benefits and Claims Incurred, Net	27	(8)	56	39
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	176	7	294	232
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	140	27	223	66
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	249	245	484	497
Policyholder Benefits and Claims Incurred, Net	(46)	(52)	(98)	(105)
Interest credited to policyholder account balances	(37)	(38)	(72)	(77)
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]
Derivative, Gain (Loss) on Derivative, Net	97	(4)	139	669
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	195	29	308	69
Net investment gains (losses)	57	17	105	31
Policyholder Benefits and Claims Incurred, Net	(185)	48	(272)	172
Interest credited to policyholder account balances	38	38	73	77
Operating Expenses	2	1	3	2
Other Comprehensive Income (Loss), before Tax	$ 680	$ 716	$ 542	$ (496)