Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ (5,205)	$ (5,072)	$ (10,641)	$ (9,717)
Net investment gains (losses)	(421)	(1,039)	(796)	(1,723)
Gain (Loss) on Derivative Instruments, Net, Pretax	508	997	1,487	1,087
Policyholder Benefits and Claims Incurred, Net	(11,485)	(11,809)	(21,559)	(21,681)
Interest credited to PABs	(2,000)	(1,933)	(4,290)	(3,797)
Operating Expenses	3,180	3,133	6,397	6,190
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(11)	(36)	(36)	(42)
Derivative, Gain (Loss) on Derivative, Net	715	1,257	1,926	1,660
Operating Expenses	0	0	0	0
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	(2)	(2)	(2)
Net investment gains (losses)	(7)	(2)	(11)	(12)
Policyholder Benefits and Claims Incurred, Net	(7)	(14)	(13)	(14)
Interest credited to PABs	(2)	(1)	(1)	(1)
Operating Expenses	0	0	0	0
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(7)	(14)	(16)	(29)
Net investment gains (losses)	(12)	79	(27)	81
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Interest credited to PABs	0	0	0	0
Operating Expenses	0	0	0	1
Other Comprehensive Income (Loss), before Tax	(157)	(737)	(141)	(482)
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	0	0	0
Other Comprehensive Income (Loss), before Tax	201	185	381	233
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax				206
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	0	0	0
Other Comprehensive Income (Loss), before Tax	184	160	344
Interest Rate Contract | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(5)	(13)	(13)	(27)
Net investment gains (losses)	(3)	55	(1)	60
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	(2)	(68)	(12)	(87)
Credit forwards [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	1	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	(1)	0	(1)	0
Currency Swap [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(2)	(1)	(3)	(2)
Net investment gains (losses)	(8)	200	(376)	311
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	1
Other Comprehensive Income (Loss), before Tax	6	(201)	373	(314)
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	0
Net investment gains (losses)	0	10	4	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
Derivative [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	0	0	0	(1)
Net investment gains (losses)	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	41	135	150	9
Interest credited to PABs	(15)	(35)	(58)	(1)
Operating Expenses	0	0	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(2)	(5)	(2)	(22)
Net investment gains (losses)	(26)	(51)	(57)	(54)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	(7)	(13)	(31)	(13)
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	0	(1)	0	0
Net investment gains (losses)	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	34	121	137	(5)
Interest credited to PABs	(13)	(34)	(55)	(2)
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	(2)	(4)	0	(21)
Net investment gains (losses)	19	39	42	42
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Interest credited to PABs	(7)	(11)	(35)	(11)
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	17	25	37	27
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)	(2)	(176)	349	(290)
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	(1)	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	104	(262)	(19)	(422)
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(264)	(205)	(482)	342
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	564	800	1,270	962
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	(9)	18	(2)	31
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	12	(85)	(22)	(88)
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(11)	(36)	(36)	(42)
Derivative, Gain (Loss) on Derivative, Net	108	409	450	921
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	218	434	571	276
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	(178)	(319)	(341)	(442)
Net Derivative Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(53)	(32)	(83)	(75)
Net investment gains (losses)	0	$ 0	0	$ 0
Derivative, Gain (Loss) on Derivative, Net	(180)		(361)
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	2	$ (3)	6	$ (8)
Interest credited to PABs	(44)	(34)	(93)	(68)
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	8	(18)	40	(35)
Policyholder Benefits and Claims Incurred, Net	0	0
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(19)		(38)
Gain (Loss) on Derivative Instruments, Net, Pretax		(18)		(36)
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	(49)	(8)	(65)	(60)
Net investment gains (losses)	(19)	77	(38)	69
Derivative, Gain (Loss) on Derivative, Net	508	997	1,487	1,087
Policyholder Benefits and Claims Incurred, Net	9	11	19	6
Interest credited to PABs	46	33	92	67
Operating Expenses	0	0	0	1
Other Comprehensive Income (Loss), before Tax	$ 44	$ (552)	$ 240	$ (249)