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Derivative Instruments (Effects Of Qualifying And Non-Qualifying Hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Line Items in which the Effects of Fair Value or Cash Flow Hedges are Recorded	$ (513)	$ (610)
Net Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Line Items in which the Effects of Fair Value or Cash Flow Hedges are Recorded	5,510	5,223
Interest and Debt Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Line Items in which the Effects of Fair Value or Cash Flow Hedges are Recorded	284	326
Interest Rate Contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	1,287	984
Interest Rate Contracts [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Net Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from AOCI into income	2	3
Interest Rate Contracts [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from AOCI into income	(16)	(5)
Interest Rate Contracts [Member] | Fair Value Hedges [Member] | Designated as Hedging Instrument [Member] | Net Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	69	63
Derivatives designated as hedging instruments	(69)	(63)
Interest Rate Contracts [Member] | Fair Value Hedges [Member] | Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged items	136	(93)
Derivatives designated as hedging instruments	(136)	93
Foreign currency contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	(3)	(1)
Foreign currency contracts [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from AOCI into income	6	9
Foreign currency contracts [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Net Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from AOCI into income	56	35
Equity market contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	971	(137)
Credit contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	(6)
Embedded derivatives - GLB [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	32	306
Reinsurance Related [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	(65)	(324)
Indexed Annuity And IUL Contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Non-Qualifying Hedges Gain (Loss)	$ (471)	$ (742)

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- Definition

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