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Fair Value of Financial Instruments (Schedule of Pre-tax (Loss) Gain Recognized as a Component of Other Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Cash Flow Hedging [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Pre-Tax Gain (Loss) Recognized in OCI (Effective Portion) $ 1 $ (41) $ (61) $ (61)