Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	$ 4,885	$ 5,436
Net investment gains (losses)	(387)	(375)
Gain (Loss) on Derivative Instruments, Net, Pretax	(432)	979
Policyholder Benefits and Claims Incurred, Net	(11,806)	(10,074)
Interest credited to PABs	1,647	2,290
Operating Expenses	3,350	3,217
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	17	25
Derivative, Gain (Loss) on Derivative, Net	(335)	1,211
Operating Expenses	0	0
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	2
Net investment gains (losses)	(1)	(4)
Policyholder Benefits and Claims Incurred, Net	(4)	(6)
Interest credited to PABs	2	3
Operating Expenses	0	0
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	19	9
Net investment gains (losses)	2	(15)
Derivative, Gain (Loss) on Derivative, Net	0	0
Interest credited to PABs	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	(145)	16
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	0
Other Comprehensive Income (Loss), before Tax	(86)	180
Foreign Exchange Forward [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax		160
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	0	0
Other Comprehensive Income (Loss), before Tax	(72)
Interest rate contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	17	8
Net investment gains (losses)	0	2
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to PABs	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	(17)	(10)
Currency Swap [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	2	1
Net investment gains (losses)	360	(368)
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to PABs	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	(362)	367
Derivative [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Net investment gains (losses)	(3)	4
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to PABs	0	0
Operating Expenses	0	0
Derivative [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	1	0
Net investment gains (losses)	0	0
Policyholder Benefits and Claims Incurred, Net	(75)	109
Interest credited to PABs	42	43
Operating Expenses	0	0
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	10	4
Net investment gains (losses)	8	(31)
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to PABs	36	24
Operating Expenses	0	0
Debt Securities [Member] | Interest rate swaps | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	1	0
Net investment gains (losses)	0	0
Policyholder Benefits and Claims Incurred, Net	(79)	103
Interest credited to PABs	40	42
Operating Expenses	0	0
Debt Securities [Member] | Currency Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	10	2
Net investment gains (losses)	(6)	23
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to PABs	36	28
Operating Expenses	0	0
Non-derivative [Domain] [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(14)	20
Foreign Currency Gain (Loss) [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Net investment gains (losses)	(358)	351
Derivative, Gain (Loss) on Derivative, Net	0	0
Policyholder Benefits and Claims Incurred, Net	0	0
Interest credited to PABs	0	0
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	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
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	121	(123)
Accumulated Other Comprehensive Income (Loss) | Interest rate swaps | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	113	(218)
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Derivative, Gain (Loss) on Derivative, Net	(245)	706
Credit derivatives — purchased | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Derivative, Gain (Loss) on Derivative, Net	9	7
Credit derivatives — written | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Derivative, Gain (Loss) on Derivative, Net	27	(34)
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	17	25
Derivative, Gain (Loss) on Derivative, Net	(59)	342
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Derivative, Gain (Loss) on Derivative, Net	(98)	353
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	0	0
Derivative, Gain (Loss) on Derivative, Net	31	(163)
Net Derivative Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	95	30
Net investment gains (losses)	0	0
Gain (Loss) on Derivative Instruments, Net, Pretax	(110)	(181)
Policyholder Benefits and Claims Incurred, Net	(2)	4
Interest credited to PABs	40	49
Other Comprehensive Income (Loss), before Tax	0	0
Net Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	35	(32)
Synthetic GICs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(19)	(19)
Embedded derivatives - other
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(3)
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income (1)	131	16
Net investment gains (losses)	1	(19)
Derivative, Gain (Loss) on Derivative, Net	(432)
Gain (Loss) on Derivative Instruments, Net, Pretax		979
Policyholder Benefits and Claims Incurred, Net	2	10
Interest credited to PABs	(38)	(46)
Operating Expenses	0	0
Other Comprehensive Income (Loss), before Tax	$ (231)	$ 196