Derivatives (Primary Risks) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 319,956		$ 319,956		$ 328,116
Estimated Fair Value Assets	10,035		10,035		11,411
Estimated Fair Value Liabilities	6,176		6,176		$ 6,975
Derivative, Gain (Loss) on Derivative, Net	(997)	$ (970)	(1,087)	$ (1,921)
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	26	4	$ 27	2
Maximum Length of Time Hedged in Cash Flow Hedge			6 years		6 years
Accumulated Other Comprehensive Income Loss	1,500		$ 1,500		$ 2,000
Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Cash Flow Hedges [Member]
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			(501)	(218)
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	63,915		63,915		63,923
Estimated Fair Value Assets	4,987		4,987		5,244
Estimated Fair Value Liabilities	3,119		3,119		3,909
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,162		6,162		6,081
Estimated Fair Value Assets	1,381		1,381		1,445
Estimated Fair Value Liabilities	581		581		556
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,080		4,080		4,143
Estimated Fair Value Assets	1,310		1,310		1,353
Estimated Fair Value Liabilities	496		496		467
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,496		1,496		602
Estimated Fair Value Assets	71		71		82
Estimated Fair Value Liabilities	0		0		0
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	586		586		1,336
Estimated Fair Value Assets	0		0		10
Estimated Fair Value Liabilities	85		85		89
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	53,895		53,895		54,162
Estimated Fair Value Assets	3,200		3,200		3,563
Estimated Fair Value Liabilities	2,538		2,538		3,315
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,175		4,175		4,107
Estimated Fair Value Assets	10		10		8
Estimated Fair Value Liabilities	242		242		262
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,832		6,832		7,447
Estimated Fair Value Assets	4		4		1
Estimated Fair Value Liabilities	879		879		1,354
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	42,888		42,888		42,608
Estimated Fair Value Assets	3,186		3,186		3,554
Estimated Fair Value Liabilities	1,417		1,417		1,699
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,858		3,858		3,680
Estimated Fair Value Assets	406		406		236
Estimated Fair Value Liabilities	0		0		38
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member] | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	858		858		680
Estimated Fair Value Assets	45		45		0
Estimated Fair Value Liabilities	0		0		38
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	361		361		236
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	256,041		256,041		264,193
Estimated Fair Value Assets	5,048		5,048		6,167
Estimated Fair Value Liabilities	3,057		3,057		3,066
Derivative, Gain (Loss) on Derivative, Net	(1,257)	$ (1,382)	(1,660)	$ (2,466)
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	29,134		29,134		31,661
Estimated Fair Value Assets	1,497		1,497		1,660
Estimated Fair Value Liabilities	921		921		1,354
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,662		1,662		381
Estimated Fair Value Assets	4		4		0
Estimated Fair Value Liabilities	56		56		32
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate floors
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	19,645		19,645		25,270
Estimated Fair Value Assets	53		53		125
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	42,165		42,165		48,290
Estimated Fair Value Assets	783		783		950
Estimated Fair Value Liabilities	0		0		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	973		973		1,453
Estimated Fair Value Assets	3		3		2
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	43,173		43,173		44,391
Estimated Fair Value Assets	304		304		473
Estimated Fair Value Liabilities	74		74		88
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Synthetic GICs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	50,453		50,453		46,316
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	12,336		12,336		12,815
Estimated Fair Value Assets	1,613		1,613		1,454
Estimated Fair Value Liabilities	325		325		383
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	15,135		15,135		16,195
Estimated Fair Value Assets	120		120		544
Estimated Fair Value Liabilities	1,169		1,169		661
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	328		328		333
Estimated Fair Value Assets	0		0		8
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	2,875		2,875		2,925
Estimated Fair Value Assets	8		8		18
Estimated Fair Value Liabilities	90		90		79
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,367		13,367		11,512
Estimated Fair Value Assets	197		197		133
Estimated Fair Value Liabilities	14		14		28
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,901		2,901		2,988
Estimated Fair Value Assets	9		9		8
Estimated Fair Value Liabilities	26		26		4
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	18,897		18,897		16,701
Estimated Fair Value Assets	449		449		765
Estimated Fair Value Liabilities	287		287		323
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	141		141		163
Estimated Fair Value Assets	4		4		4
Estimated Fair Value Liabilities	1		1		1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity total return swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,856		2,856		2,799
Estimated Fair Value Assets	4		4		23
Estimated Fair Value Liabilities	93		93		112
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Derivatives hedging MRBs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	16,912		16,912		18,814
Estimated Fair Value Assets	177		177		300
Estimated Fair Value Liabilities	1,049		1,049		1,147
Not Designated as Hedging Instrument, Economic Hedge | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,064		8,064		9,098
Estimated Fair Value Assets	13		13		41
Estimated Fair Value Liabilities	690		690		764
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,065		1,065		887
Estimated Fair Value Assets	11		11		26
Estimated Fair Value Liabilities	55		55		2
Not Designated as Hedging Instrument, Economic Hedge | Equity
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	7,783		7,783		8,829
Estimated Fair Value Assets	153		153		233
Estimated Fair Value Liabilities	$ 304		$ 304		$ 381