Segment Information (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) division segment	Jun. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of divisions | division			4
Number of reportable segments | segment			7
Segment Reporting Information [Line Items]
Total deferred gain (loss)	$ 224,000,000		$ 224,000,000
Synthetic Gic Fees	39,000,000	$ 43,000,000	79,000,000	$ 85,000,000
Realized investment gains (losses), net, and related adjustments
Segment Reporting Information [Line Items]
Derivative, Gain (Loss) on Derivative, Net, Terminated Or Offset Before Maturity	13,000,000	34,000,000	26,000,000	52,000,000
Gain (Loss) From Derivative Counterparty Exposure Adjustments	0	9,000,000	0	16,000,000
Gain (Loss) From Non-Performance Risk Adjustments	$ (2,000,000)	$ (1,000,000)	$ 1,000,000	$ (2,000,000)