Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ (3,585)	$ (5,568)	$ (11,452)	$ (16,162)
Net investment gains (losses)	(414)	(84)	(1,617)	1,655
Derivative, Gain (Loss) on Derivative, Net	(480)	(218)	(2,534)	(2,032)
Policyholder Benefits and Claims Incurred, Net	(17,993)	(10,103)	(40,976)	(30,031)
Interest credited to policyholder account balances	(980)	(1,287)	(2,102)	(4,153)
Operating Expenses	2,723	3,284	8,826	9,315
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(8)	(2)	(58)	32
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(498)	(523)	(3,175)	(3,503)
Policyholder Benefits and Claims Incurred, Net	(22)	9	(233)	(252)
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	0	(5)	(1)	(7)
Net investment gains (losses)	17	(2)	72	(11)
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(28)	(5)	(65)	(39)
Interest credited to policyholder account balances	(1)	0	(2)	0
Operating Expenses	0	0	0	0
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(16)	(16)	(50)	(47)
Net investment gains (losses)	(25)	3	25	43
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	4	3
Other Comprehensive Income (Loss), before Tax	1,541	678	1,816	107
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	48	14	315	89
Nonperformance Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	39	3	43	(48)
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax				58
Net Derivative Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	254	258	738	755
Net Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(236)	47	(97)	716
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	29	12	240
Interest Rate Contract | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(15)	(14)	(46)	(41)
Net investment gains (losses)	(16)	6	44	54
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	3	2
Other Comprehensive Income (Loss), before Tax	0	(21)	(93)	(97)
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)	(2)	(4)	(6)
Net investment gains (losses)	(567)	(259)	(1,405)	(383)
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	1	1
Other Comprehensive Income (Loss), before Tax	566	257	1,400	376
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	20	(2)	81	(6)
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	(2)	(1)	(9)	(4)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	299	53	1,159	418
Interest credited to policyholder account balances	(16)	0	(26)	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	(67)	(28)	(160)	(40)
Net investment gains (losses)	(97)	(9)	(348)	(144)
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	(1)	(2)	(9)	4
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	271	48	1,094	379
Interest credited to policyholder account balances	(15)	0	(24)	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	(68)	(22)	(159)	33
Net investment gains (losses)	94	9	339	139
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	19	2	75	31
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)	558	256	1,386	372
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	20	0	(52)
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	1,475	398	2,676	567
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(500)	24	(2,167)	(687)
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	(2)	0
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(53)	(128)	(791)	(734)
Policyholder Benefits and Claims Incurred, Net	(2)	(2)	(4)	1
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	7	4	99	16
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	1	(2)	(244)	33
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	(8)	(1)	(53)	33
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	215	47	966	(992)
Policyholder Benefits and Claims Incurred, Net	(64)	(5)	(333)	(202)
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	(1)	(3)	(1)
Net investment gains (losses)	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(649)	(379)	(3,480)	(1,993)
Policyholder Benefits and Claims Incurred, Net	40	12	96	51
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	(19)	(65)	275	167
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	(107)	(62)	(330)	(128)
Net investment gains (losses)	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(33)	(55)	(131)	(160)
Interest credited to policyholder account balances	(41)	(43)	(113)	(120)
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]
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(131)	(81)	(439)	(150)
Net investment gains (losses)	(8)	1	97	32
Policyholder Benefits and Claims Incurred, Net	(27)	(41)	(299)	131
Interest credited to policyholder account balances	(42)	(43)	(115)	(120)
Operating Expenses	1	1	4	3
Other Comprehensive Income (Loss), before Tax	$ 1,589	$ 692	$ 2,131	$ 196