Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ 5,227	$ 4,825	$ 15,868	$ 14,542
Net investment gains (losses)	(77)	(927)	(873)	(2,650)
Gain (Loss) on Derivative Instruments, Net, Pretax	(767)	1,202	720	2,289
Policyholder Benefits and Claims Incurred, Net	(10,597)	(11,130)	(32,156)	(32,811)
Interest credited to PABs	(2,037)	(1,658)	(6,327)	(5,455)
Operating Expenses	3,263	3,204	9,660	9,394
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	10	8	46	34
Derivative, Gain (Loss) on Derivative, Net	(673)	1,538	1,253	3,198
Operating Expenses	0	0	0	0
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	1	1	1	1
Net investment gains (losses)	(4)	(7)	(15)	(19)
Policyholder Benefits and Claims Incurred, Net	(6)	(7)	(19)	(21)
Interest credited to PABs	(3)	(2)	(2)	(1)
Operating Expenses	0	0	0	0
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	6	12	22	41
Net investment gains (losses)	16	4	(11)	85
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Interest credited to PABs	0	0	0	0
Operating Expenses	0	1	0	2
Other Comprehensive Income (Loss), before Tax	(482)	(733)	(623)	(1,215)
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	5	0	5
Other Comprehensive Income (Loss), before Tax	(174)	84	207	317
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax				280
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	5	0	5
Other Comprehensive Income (Loss), before Tax	(141)	74	203
Interest Rate Contract | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	5	11	18	38
Net investment gains (losses)	(1)	17	(2)	77
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	0	0	0	0
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	(4)	(28)	(16)	(115)
Credit forwards [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	0	0	1	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	0	0	0	0
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	(1)	0
Currency Swap [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	1	1	4	3
Net investment gains (losses)	602	(301)	226	10
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	0	0	0	0
Operating Expenses	0	1	0	2
Other Comprehensive Income (Loss), before Tax	(603)	299	(230)	(15)
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	(15)	(2)	(11)	(2)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	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	1	2	1	3
Net investment gains (losses)	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(185)	230	(35)	239
Interest credited to PABs	(92)	(60)	(34)	(59)
Operating Expenses	0	0	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	23	12	21	10
Net investment gains (losses)	41	(19)	(16)	(73)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	(32)	(27)	(1)	(14)
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	3	1	3
Net investment gains (losses)	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(191)	223	(54)	218
Interest credited to PABs	(93)	(59)	(38)	(57)
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	22	12	22	9
Net investment gains (losses)	(30)	14	12	56
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	(34)	(26)	(1)	(15)
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	(33)	10	4	37
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	(585)	288	(236)	(2)
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	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
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	0	0	0	(1)
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(161)	(293)	(180)	(715)
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	286	(711)	(196)	(369)
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(573)	556	697	1,518
Credit derivatives — purchased | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	8	(30)	6	1
Credit derivatives — written | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(25)	40	(47)	(48)
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	10	8	46	34
Derivative, Gain (Loss) on Derivative, Net	95	(120)	545	801
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(360)	1,105	211	1,381
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	182	(13)	(159)	(455)
Net Derivative Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	33	82	116	157
Net investment gains (losses)	0	$ 0	0	$ 0
Derivative, Gain (Loss) on Derivative, Net	(136)		(497)
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	5	$ 3	11	$ (5)
Interest credited to PABs	(36)	(43)	(129)	(111)
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	(61)	86	(21)	51
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(19)		(57)
Gain (Loss) on Derivative Instruments, Net, Pretax		(20)		(56)
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	28	103	93	163
Net investment gains (losses)	12	2	(26)	71
Derivative, Gain (Loss) on Derivative, Net	(767)	1,202	720	2,289
Policyholder Benefits and Claims Incurred, Net	11	10	30	16
Interest credited to PABs	39	45	131	112
Operating Expenses	0	1	0	2
Other Comprehensive Income (Loss), before Tax	$ (656)	$ (649)	$ (416)	$ (898)