Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Details)

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Assets and Liabilities Measured at Fair Value (Details)
€ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 15, 2016
EUR (€)
Jun. 15, 2016
USD ($)
Dec. 31, 2015
EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount       $ 125  
Non-current assets:          
Interest rate swap arrangements (note 8) $ 2 $ 2      
Designated as Hedging Instrument | Foreign Exchange Contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount | €     € 500    
Designated as Hedging Instrument | Net Investment Hedging | Foreign Exchange Contract          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative, notional amount | €         € 500
Recurring          
Current assets:          
Cash equivalents 42 113      
Non-current assets:          
Interest rate swap arrangements (note 8) 2 2      
Long-term liabilities:          
Debt (note 8) 5,132 5,092      
Recurring | Level 1          
Current assets:          
Cash equivalents 42 113      
Recurring | Level 2          
Non-current assets:          
Interest rate swap arrangements (note 8) 2 2      
Long-term liabilities:          
Debt (note 8) $ 5,132 $ 5,092