Derivatives (Primary Risks) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 288,778		$ 288,778		$ 301,234
Estimated Fair Value Assets	8,241		8,241		8,737
Estimated Fair Value Liabilities	7,347		7,347		$ 6,298
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	4	$ 26	$ (6)	$ 27
Maximum Length of Time Hedged in Cash Flow Hedge			5 years		5 years
Accumulated Other Comprehensive Income Loss	25		$ 25		$ 166
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			(385)	(501)
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	65,275		65,275		64,155
Estimated Fair Value Assets	4,389		4,389		4,215
Estimated Fair Value Liabilities	3,823		3,823		3,320
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,661		6,661		6,475
Estimated Fair Value Assets	1,131		1,131		1,312
Estimated Fair Value Liabilities	743		743		600
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,978		4,978		4,550
Estimated Fair Value Assets	1,094		1,094		1,257
Estimated Fair Value Liabilities	644		644		535
Derivatives Designated as Hedging Instruments: | Fair Value Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,333		1,333		1,475
Estimated Fair Value Assets	37		37		55
Estimated Fair Value Liabilities	12		12		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	87		87		65
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	55,208		55,208		54,177
Estimated Fair Value Assets	2,666		2,666		2,509
Estimated Fair Value Liabilities	3,080		3,080		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	353		353		265
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,590		5,590		6,115
Estimated Fair Value Assets	33		33		51
Estimated Fair Value Liabilities	1,008		1,008		938
Derivatives Designated as Hedging Instruments: | Cash Flow Hedges [Member] | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	45,463		45,463		43,906
Estimated Fair Value Assets	2,633		2,633		2,457
Estimated Fair Value Liabilities	1,719		1,719		1,509
Derivatives Designated as Hedging Instruments: | Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,406		3,406		3,503
Estimated Fair Value Assets	592		592		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	406		406		503
Estimated Fair Value Assets	51		51		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	541		541		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	223,503		223,503		237,079
Estimated Fair Value Assets	3,852		3,852		4,522
Estimated Fair Value Liabilities	3,524		3,524		2,978
Derivative, Gain (Loss) on Derivative, Net	(715)	$ (1,257)	(1,926)	$ (1,660)
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	29,726		29,726		29,801
Estimated Fair Value Assets	1,459		1,459		1,497
Estimated Fair Value Liabilities	1,276		1,276		1,102
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,816		2,816		2,383
Estimated Fair Value Assets	42		42		69
Estimated Fair Value Liabilities	82		82		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	34		34		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	27,152		27,152		30,016
Estimated Fair Value Assets	245		245		373
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	1,853		1,853		1,243
Estimated Fair Value Assets	4		4		1
Estimated Fair Value Liabilities	3		3		5
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	42,377		42,377		43,926
Estimated Fair Value Assets	232		232		385
Estimated Fair Value Liabilities	153		153		103
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Synthetic GICs
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	48,982		48,982		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	10,716		10,716		11,891
Estimated Fair Value Assets	1,210		1,210		1,200
Estimated Fair Value Liabilities	140		140		356
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,657		13,657		14,128
Estimated Fair Value Assets	29		29		310
Estimated Fair Value Liabilities	1,398		1,398		806
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Currency futures
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	292		292		314
Estimated Fair Value Assets	0		0		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	320		320		50
Estimated Fair Value Assets	35		35		0
Estimated Fair Value Liabilities	35		35		0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,812		2,812		2,877
Estimated Fair Value Assets	7		7		3
Estimated Fair Value Liabilities	72		72		79
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	13,952		13,952		12,468
Estimated Fair Value Assets	247		247		233
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	1,790		1,790		2,163
Estimated Fair Value Assets	10		10		8
Estimated Fair Value Liabilities	7		7		11
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	14,714		14,714		19,421
Estimated Fair Value Assets	297		297		399
Estimated Fair Value Liabilities	250		250		255
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	96		96		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	2,020		2,020		1,912
Estimated Fair Value Assets	1		1		1
Estimated Fair Value Liabilities	100		100		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	14,145		14,145		15,001
Estimated Fair Value Assets	136		136		112
Estimated Fair Value Liabilities	988		988		1,038
Not Designated as Hedging Instrument, Economic Hedge | Interest Rate Contract
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,107		9,107		9,096
Estimated Fair Value Assets	24		24		13
Estimated Fair Value Liabilities	762		762		663
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency exchange rate
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	505		505		716
Estimated Fair Value Assets	1		1		22
Estimated Fair Value Liabilities	20		20		2
Not Designated as Hedging Instrument, Economic Hedge | Equity
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,533		4,533		5,189
Estimated Fair Value Assets	111		111		77
Estimated Fair Value Liabilities	$ 206		$ 206		$ 373