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Hedges and Derivative Financial Instruments - Narrative (Details)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
EUR (€)
contract
Jun. 30, 2017
USD ($)
contract
Dec. 31, 2016
EUR (€)
contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of interest rate derivatives held (in contracts) | contract     0 0 0
Derivative net hedge ineffectiveness $ 0 $ 0      
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months       $ 13,000,000  
Net Investment Hedges          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Notional Amount | €     € 800   € 500