Investments and Derivative Instruments Level 4 Cash Flow Hedges (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivatives in Cash Flow Hedging Relationships [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 21,000,000
Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	3,000,000	$ 24,000,000	$ (146,000,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	2,000,000	(2,000,000)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	23,000,000	36,000,000	131,000,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	3,000,000	34,000,000	(158,000,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		2,000,000	(2,000,000)
Currency Swap [Member] | Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		(10,000,000)	12,000,000
Gain (Loss) on Investments [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(1,000,000)	70,000,000	[1]
Gain (Loss) on Investments [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(13,000,000)	4,000,000
Investment Income [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 50,000,000	$ 57,000,000
AOCI Attributable to Parent [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	$ 0

[1] The December 31, 2013 amounts includes $71 of net gains on cash flow hedging instruments relating to the sales of the Retirement Plans and Individual Life businesses.