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Financial Instruments - Carrying Amount of Hedged Fixed Interest Rate Debt (Details) - Debt - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Notional value of borrowings (and related derivatives) $ (279) $ (801)
Cumulative fair value hedging adjustments (1) 0
Carrying amount of borrowings $ (280) $ (801)