Derivatives (Primary Risks) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 290,446		$ 290,446		$ 301,234
Estimated Fair Value Assets	8,172		8,172		8,737
Estimated Fair Value Liabilities	6,357		6,357		6,298
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	10	$ 1	4	$ 28
Accumulated Other Comprehensive Income Loss	(457)		(457)		166
Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Cash Flow Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Cash Flow Hedges [Member] | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Not Designated as Hedging Instrument, Economic Hedge | Derivative Contract [Domain]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net			(395)	(740)
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	65,637		65,637		64,155
Estimated Fair Value Assets	4,113		4,113		4,215
Estimated Fair Value Liabilities	3,467		3,467		3,320
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	7,202		7,202		6,475
Estimated Fair Value Assets	1,177		1,177		1,312
Estimated Fair Value Liabilities	630		630		600
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,188		5,188		4,550
Estimated Fair Value Assets	1,134		1,134		1,257
Estimated Fair Value Liabilities	554		554		535
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,664		1,664		1,475
Estimated Fair Value Assets	43		43		55
Estimated Fair Value Liabilities	7		7		0
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	350		350		450
Estimated Fair Value Assets	0		0		0
Estimated Fair Value Liabilities	69		69		65
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	55,230		55,230		54,177
Estimated Fair Value Assets	2,517		2,517		2,509
Estimated Fair Value Liabilities	2,837		2,837		2,712
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,155		4,155		4,156
Estimated Fair Value Assets	0		0		1
Estimated Fair Value Liabilities	259		259		265
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,090		5,090		6,115
Estimated Fair Value Assets	59		59		51
Estimated Fair Value Liabilities	923		923		938
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	45,985		45,985		43,906
Estimated Fair Value Assets	2,458		2,458		2,457
Estimated Fair Value Liabilities	1,655		1,655		1,509
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,205		3,205		3,503
Estimated Fair Value Assets	419		419		394
Estimated Fair Value Liabilities	0		0		8
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	205		205		503
Estimated Fair Value Assets	7		7		0
Estimated Fair Value Liabilities	0		0		8
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Currency options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,000		3,000		3,000
Estimated Fair Value Assets	412		412		394
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	224,809		224,809		237,079
Estimated Fair Value Assets	4,059		4,059		4,522
Estimated Fair Value Liabilities	2,890		2,890		2,978
Derivative, Gain (Loss) on Derivative, Net	673	$ (1,538)	(1,253)	$ (3,198)
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	29,675		29,675		29,801
Estimated Fair Value Assets	1,654		1,654		1,497
Estimated Fair Value Liabilities	1,062		1,062		1,102
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,934		2,934		2,383
Estimated Fair Value Assets	130		130		69
Estimated Fair Value Liabilities	76		76		36
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate floors
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,228		9,228		15,321
Estimated Fair Value Assets	48		48		41
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate caps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	29,052		29,052		30,016
Estimated Fair Value Assets	130		130		373
Estimated Fair Value Liabilities	1		1		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,732		1,732		1,243
Estimated Fair Value Assets	2		2		1
Estimated Fair Value Liabilities	2		2		5
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	43,481		43,481		43,926
Estimated Fair Value Assets	269		269		385
Estimated Fair Value Liabilities	119		119		103
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Synthetic GICs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	49,081		49,081		49,066
Estimated Fair Value Assets	0		0		0
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	10,755		10,755		11,891
Estimated Fair Value Assets	981		981		1,200
Estimated Fair Value Liabilities	231		231		356
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,511		13,511		14,128
Estimated Fair Value Assets	283		283		310
Estimated Fair Value Liabilities	961		961		806
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	321		321		314
Estimated Fair Value Assets	2		2		2
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0		0		50
Estimated Fair Value Assets	0		0		0
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,801		2,801		2,877
Estimated Fair Value Assets	4		4		3
Estimated Fair Value Liabilities	74		74		79
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	12,851		12,851		12,468
Estimated Fair Value Assets	267		267		233
Estimated Fair Value Liabilities	2		2		5
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,866		1,866		2,163
Estimated Fair Value Assets	13		13		8
Estimated Fair Value Liabilities	6		6		11
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	14,106		14,106		19,421
Estimated Fair Value Assets	276		276		399
Estimated Fair Value Liabilities	263		263		255
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	114		114		99
Estimated Fair Value Assets	0		0		0
Estimated Fair Value Liabilities	3		3		2
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity total return swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,301		2,301		1,912
Estimated Fair Value Assets	0		0		1
Estimated Fair Value Liabilities	90		90		218
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Longevity Swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,000		1,000		0
Derivative Liability, Not Subject to Master Netting Arrangement	0		0		0
Derivative Asset, Not Subject to Master Netting Arrangement	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Derivatives hedging MRBs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	14,328		14,328		15,001
Estimated Fair Value Assets	127		127		112
Estimated Fair Value Liabilities	797		797		1,038
Not Designated as Hedging Instrument, Economic Hedge | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,092		9,092		9,096
Estimated Fair Value Assets	13		13		13
Estimated Fair Value Liabilities	603		603		663
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	577		577		716
Estimated Fair Value Assets	20		20		22
Estimated Fair Value Liabilities	1		1		2
Not Designated as Hedging Instrument, Economic Hedge | Equity
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,659		4,659		5,189
Estimated Fair Value Assets	94		94		77
Estimated Fair Value Liabilities	$ 193		$ 193		$ 373