Derivatives (Primary Risks) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 265,548	$ 301,234
Estimated Fair Value Assets	8,212	8,737
Estimated Fair Value Liabilities	7,259	6,298
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	66,279	64,155
Estimated Fair Value Assets	4,543	4,215
Estimated Fair Value Liabilities	3,890	3,320
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,792	6,475
Estimated Fair Value Assets	1,051	1,312
Estimated Fair Value Liabilities	774	600
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,188	4,550
Estimated Fair Value Assets	1,018	1,257
Estimated Fair Value Liabilities	666	535
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,454	1,475
Estimated Fair Value Assets	33	55
Estimated Fair Value Liabilities	67	0
Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	150	450
Estimated Fair Value Assets	0	0
Estimated Fair Value Liabilities	41	65
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	54,934	54,177
Estimated Fair Value Assets	2,914	2,509
Estimated Fair Value Liabilities	3,116	2,712
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,154	4,156
Estimated Fair Value Assets	0	1
Estimated Fair Value Liabilities	359	265
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,901	6,115
Estimated Fair Value Assets	56	51
Estimated Fair Value Liabilities	880	938
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	45,879	43,906
Estimated Fair Value Assets	2,858	2,457
Estimated Fair Value Liabilities	1,877	1,509
Derivatives Designated as Hedging Instruments [Member] | Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,553	3,503
Estimated Fair Value Assets	578	394
Estimated Fair Value Liabilities	0	8
Derivatives Designated as Hedging Instruments [Member] | Foreign Operations Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,553	503
Estimated Fair Value Assets	42	0
Estimated Fair Value Liabilities	0	8
Derivatives Designated as Hedging Instruments [Member] | Foreign Operations Hedges [Member] | Currency options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,000	3,000
Estimated Fair Value Assets	536	394
Estimated Fair Value Liabilities	0	0
Not Designated as Hedging Instrument, Economic Hedge | Derivative Contract [Domain]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(476)	(596)
Not Designated as Hedging Instrument, Economic Hedge | Interest rate
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,913	9,096
Estimated Fair Value Assets	11	13
Estimated Fair Value Liabilities	768	663
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	378	716
Estimated Fair Value Assets	0	22
Estimated Fair Value Liabilities	2	2
Not Designated as Hedging Instrument, Economic Hedge | Equity
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,294	5,189
Estimated Fair Value Assets	132	77
Estimated Fair Value Liabilities	113	373
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	199,269	237,079
Estimated Fair Value Assets	3,669	4,522
Estimated Fair Value Liabilities	3,369	2,978
Derivative, Gain (Loss) on Derivative, Net	(2,414)	(3,234)	$ (3,401)
Not Designated as Hedging Instrument [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	29,238	29,801
Estimated Fair Value Assets	1,414	1,497
Estimated Fair Value Liabilities	1,263	1,102
Not Designated as Hedging Instrument [Member] | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,128	2,383
Estimated Fair Value Assets	135	69
Estimated Fair Value Liabilities	77	36
Not Designated as Hedging Instrument [Member] | Interest rate floors
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,169	15,321
Estimated Fair Value Assets	38	41
Estimated Fair Value Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Interest rate caps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	17,998	30,016
Estimated Fair Value Assets	133	373
Estimated Fair Value Liabilities	1	0
Not Designated as Hedging Instrument [Member] | Interest rate futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,667	1,243
Estimated Fair Value Assets	1	1
Estimated Fair Value Liabilities	1	5
Not Designated as Hedging Instrument [Member] | Interest rate options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	34,939	43,926
Estimated Fair Value Assets	210	385
Estimated Fair Value Liabilities	217	103
Not Designated as Hedging Instrument [Member] | Synthetic GICs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	49,599	49,066
Estimated Fair Value Assets	0	0
Estimated Fair Value Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	10,708	11,891
Estimated Fair Value Assets	1,192	1,200
Estimated Fair Value Liabilities	190	356
Not Designated as Hedging Instrument [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,471	14,128
Estimated Fair Value Assets	47	310
Estimated Fair Value Liabilities	1,277	806
Not Designated as Hedging Instrument [Member] | Currency futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	301	314
Estimated Fair Value Assets	1	2
Estimated Fair Value Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Currency options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	50
Estimated Fair Value Assets	0	0
Estimated Fair Value Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Credit default swaps — purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,791	2,877
Estimated Fair Value Assets	14	3
Estimated Fair Value Liabilities	67	79
Not Designated as Hedging Instrument [Member] | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,764	12,468
Estimated Fair Value Assets	201	233
Estimated Fair Value Liabilities	5	5
Not Designated as Hedging Instrument [Member] | Equity futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,840	2,163
Estimated Fair Value Assets	9	8
Estimated Fair Value Liabilities	6	11
Not Designated as Hedging Instrument [Member] | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	12,743	19,421
Estimated Fair Value Assets	233	399
Estimated Fair Value Liabilities	253	255
Not Designated as Hedging Instrument [Member] | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	114	99
Estimated Fair Value Assets	0	0
Estimated Fair Value Liabilities	3	2
Not Designated as Hedging Instrument [Member] | Equity Total Return Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,799	1,912
Estimated Fair Value Assets	41	1
Estimated Fair Value Liabilities	9	218
Not Designated as Hedging Instrument [Member] | Derivatives hedging MRBs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,585	15,001
Estimated Fair Value Assets	143	112
Estimated Fair Value Liabilities	883	1,038
Not Designated as Hedging Instrument [Member] | Longevity Swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,000	0
Derivative Asset, Not Subject to Master Netting Arrangement	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	$ 0	$ 0