Derivative Instruments (Gains (Losses) On Derivative Instruments Recorded Within Income (Loss) From Continuing Operations) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Gains (losses)
Gains (losses)		$ (158)	$ (128)	$ (300)	$ (411)
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member]
Gains (losses)
Gains (losses)		4	1	15	7
Designated as Hedging Instrument [Member] | Fair Value Hedges [Member]
Gains (losses)
Gains (losses)		20	3	64	5
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[1]	1	2	3	3
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member]
Gains (losses)
Gains (losses)	[1]	7	4	18	12
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[1]	(2)	(5)	(11)	(18)
Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[2]	(4)	(5)	(6)	(13)
Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[2]	5	6	11	21
Designated as Hedging Instrument [Member] | Realized Gain (Loss) [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member]
Gains (losses)
Gains (losses)	[3]				5
Designated as Hedging Instrument [Member] | Realized Gain (Loss) [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[3]	17	2	64	2
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[3]	(167)	18	(577)	161
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Foreign currency contracts [Member]
Gains (losses)
Gains (losses)	[3]		1	2	1
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Equity market contracts [Member]
Gains (losses)
Gains (losses)	[3]	(199)	(347)	(280)	(1,163)
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | GLB Embedded Derivatives [Member]
Gains (losses)
Gains (losses)	[3]	333	233	603	784
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Embedded derivatives - Reinsurance related [Member]
Gains (losses)
Gains (losses)	[3]	5	3	37	3
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Indexed Annuity And Embedded Derivatives [Member]
Gains (losses)
Gains (losses)	[3]	(164)	(46)	(175)	(230)
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Commissions and other expenses [Member] | Equity market contracts [Member]
Gains (losses)
Gains (losses)	[4]	$ 10	$ 6	$ 11	$ 21

[1] Reported in net investment income on our Consolidated Statements of Comprehensive Income (Loss).

[2] Reported in interest and debt expense on our Consolidated Statements of Comprehensive Income (Loss).

[3] Reported in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).

[4] Reported in commissions and other expenses on our Consolidated Statements of Comprehensive Income (Loss).