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Financial Instruments - Derivatives and Hedging (Narrative) (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
derivative_instrument
Dec. 31, 2016
USD ($)
derivative_instrument
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Amount expected to be reclassified from accumulated other comprehensive loss in the next twelve months $ 7,000,000  
Designated as Hedging Instrument | Interest Rate Swaps    
Derivative [Line Items]    
Number of instruments | derivative_instrument 9 9
Notional amount $ 1,400,000,000 $ 1,400,000,000