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Fair Value Measurements and Derivatives - Additional Information (Details)
€ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   $ 2,104,000,000      
Balance of deferred loss on net investment hedge   4,000,000      
Cash flow hedge (gain) loss to be reclassified to earnings during next twelve months $ 4,000,000 (2,000,000)      
Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   1,407,000,000      
Interest Rate Swap [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Fair value adjustment to the carrying amount of the December 2024 Notes   6,000,000      
Amortization of fair value adjustment to debt   1,000,000      
Interest Rate Swap [Member] | Fair Value Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   0      
Forward Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Maximum Remaining Maturity of Foreign Currency Derivatives 18 months        
Foreign Exchange Forward [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 306,000,000 1,007,000,000      
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   310,000,000      
Currency Swap [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 1,112,000,000 1,097,000,000      
Currency Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   1,097,000,000      
Senior Notes Due June 2026 [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, amount of hedged item   375,000,000     $ 375,000,000
Senior Notes Due June 2026 [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   375,000,000 € 338    
Intercompany Notes [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, amount of hedged item | €     281 € 281  
Intercompany Notes [Member] | Net Investment Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   0      
Intercompany Notes [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   300,000,000 281    
Senior Notes Due April 2025 [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, amount of hedged item $ 400,000,000 400,000,000      
Senior Notes Due April 2025 [Member] | Currency Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount   $ 400,000,000 € 371