Derivatives (Primary Risks) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 264,833		$ 264,833		$ 265,548
Estimated Fair Value Assets	7,477		7,477		8,212
Estimated Fair Value Liabilities	7,543		7,543		7,259
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	2	$ 4	14	$ (6)
Accumulated Other Comprehensive Income Loss	(1,900)		(1,900)		357
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 contracts
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			(130)	(385)
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	66,402		66,402		66,279
Estimated Fair Value Assets	3,994		3,994		4,543
Estimated Fair Value Liabilities	4,218		4,218		3,890
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,302		6,302		6,792
Estimated Fair Value Assets	1,036		1,036		1,051
Estimated Fair Value Liabilities	695		695		774
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,108		5,108		5,188
Estimated Fair Value Assets	1,006		1,006		1,018
Estimated Fair Value Liabilities	651		651		666
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,044		1,044		1,454
Estimated Fair Value Assets	30		30		33
Estimated Fair Value Liabilities	8		8		67
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	150		150		150
Estimated Fair Value Assets	0		0		0
Estimated Fair Value Liabilities	36		36		41
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	55,764		55,764		54,934
Estimated Fair Value Assets	2,513		2,513		2,914
Estimated Fair Value Liabilities	3,479		3,479		3,116
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,164		4,164		4,154
Estimated Fair Value Assets	14		14		0
Estimated Fair Value Liabilities	299		299		359
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,796		4,796		4,901
Estimated Fair Value Assets	57		57		56
Estimated Fair Value Liabilities	1,114		1,114		880
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	46,804		46,804		45,879
Estimated Fair Value Assets	2,442		2,442		2,858
Estimated Fair Value Liabilities	2,066		2,066		1,877
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,336		4,336		4,553
Estimated Fair Value Assets	445		445		578
Estimated Fair Value Liabilities	44		44		0
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,236		1,236		1,553
Estimated Fair Value Assets	2		2		42
Estimated Fair Value Liabilities	44		44		0
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Currency options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,100		3,100		3,000
Estimated Fair Value Assets	443		443		536
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	198,431		198,431		199,269
Estimated Fair Value Assets	3,483		3,483		3,669
Estimated Fair Value Liabilities	3,325		3,325		3,369
Derivative, Gain (Loss) on Derivative, Net	(899)	$ (715)	(564)	$ (1,926)
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	26,669		26,669		29,238
Estimated Fair Value Assets	1,454		1,454		1,414
Estimated Fair Value Liabilities	1,304		1,304		1,263
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,221		3,221		3,128
Estimated Fair Value Assets	146		146		135
Estimated Fair Value Liabilities	109		109		77
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate floors
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,640		5,640		6,169
Estimated Fair Value Assets	60		60		38
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	16,648		16,648		17,998
Estimated Fair Value Assets	56		56		133
Estimated Fair Value Liabilities	2		2		1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,195		2,195		1,667
Estimated Fair Value Assets	13		13		1
Estimated Fair Value Liabilities	1		1		1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	32,573		32,573		34,939
Estimated Fair Value Assets	196		196		210
Estimated Fair Value Liabilities	132		132		217
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Synthetic GICs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	53,740		53,740		49,599
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	11,593		11,593		10,708
Estimated Fair Value Assets	937		937		1,192
Estimated Fair Value Liabilities	326		326		190
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	14,284		14,284		13,471
Estimated Fair Value Assets	73		73		47
Estimated Fair Value Liabilities	758		758		1,277
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	315		315		301
Estimated Fair Value Assets	0		0		1
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	500		500		0
Estimated Fair Value Assets	34		34		0
Estimated Fair Value Liabilities	52		52		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,771		2,771		2,791
Estimated Fair Value Assets	5		5		14
Estimated Fair Value Liabilities	63		63		67
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,954		11,954		11,764
Estimated Fair Value Assets	238		238		201
Estimated Fair Value Liabilities	5		5		5
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,691		1,691		1,840
Estimated Fair Value Assets	1		1		9
Estimated Fair Value Liabilities	20		20		6
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,717		11,717		12,743
Estimated Fair Value Assets	270		270		233
Estimated Fair Value Liabilities	320		320		253
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	121		121		114
Estimated Fair Value Assets	0		0		0
Estimated Fair Value Liabilities	3		3		3
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity total return swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,799		1,799		1,799
Estimated Fair Value Assets	0		0		41
Estimated Fair Value Liabilities	230		230		9
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Longevity Swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,000		1,000		1,000
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	13,759		13,759		13,585
Estimated Fair Value Assets	110		110		143
Estimated Fair Value Liabilities	1,059		1,059		883
Not Designated as Hedging Instrument, Economic Hedge | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,148		9,148		8,913
Estimated Fair Value Assets	7		7		11
Estimated Fair Value Liabilities	712		712		768
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	576		576		378
Estimated Fair Value Assets	2		2		0
Estimated Fair Value Liabilities	17		17		2
Not Designated as Hedging Instrument, Economic Hedge | Equity
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,035		4,035		4,294
Estimated Fair Value Assets	101		101		132
Estimated Fair Value Liabilities	$ 330		$ 330		$ 113