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Fair Value Measurements (Narrative) (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]  
Asset value transferred into Level 1, as measured from the beginning of the reporting period $ 151
Liability value transferred into Level 1, as measured from the beginning of the reporting period $ 117