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Financial Instruments - Derivatives and Hedging (Cash Flow Hedges Outstanding) (Details) - Designated as Hedging Instrument - Interest Rate Swaps
Sep. 30, 2017
USD ($)
derivative_instrument
Dec. 31, 2016
USD ($)
derivative_instrument
Derivative [Line Items]    
Number of Instruments | derivative_instrument 9 9
Notional Amount | $ $ 1,400,000,000 $ 1,400,000,000