Derivative Instruments (Gains (Losses) On Derivative Instruments Recorded Within Income (Loss) From Continuing Operations) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Gains (losses)
Gains (losses)		$ (37)	$ (69)
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member]
Gains (losses)
Gains (losses)		3	7
Designated as Hedging Instrument [Member] | Fair Value Hedges [Member]
Gains (losses)
Gains (losses)		35	9
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[1]	1	2
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member]
Gains (losses)
Gains (losses)	[1]	5	4
Designated as Hedging Instrument [Member] | Net Investment Income [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[1]	(4)	(7)
Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[2]	(3)	(4)
Designated as Hedging Instrument [Member] | Interest and Debt Expense [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[2]	6	8
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]	33	8
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Interest rate contracts [Member]
Gains (losses)
Gains (losses)	[3]	(314)	(50)
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Foreign currency contracts [Member]
Gains (losses)
Gains (losses)	[3]	2	3
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | Equity market contracts [Member]
Gains (losses)
Gains (losses)	[3]	7	(528)
Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] | Realized Gain (Loss) [Member] | GLB Embedded Derivatives [Member]
Gains (losses)
Gains (losses)	[3]	157	597
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]	23	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]	52	(120)
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]	$ (2)	$ 10

[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).