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Debt (Senior Unsecured Notes) (Details)
€ in Millions, $ in Millions
May. 12, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
May. 12, 2015
EUR (€)
Debt Instrument [Line Items]        
Long-term debt, gross $ 3,995      
Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 2,503      
Debt Instrument, interest rate, additional 0.25%     0.25%
Threshold consecutive days following registration default 90 days      
Threshold consecutive days following registration default, additional 90 days      
Interest rate additional maximum 0.50%     0.50%
Obligation threshold for debt to become guaranteed $ 75      
Repurchase price obligation, percentage of principal amount redeemed in event of change of control 101.00%     101.00%
Repurchase price obligation, percentage of principal amount redeemed in event of change of asset dispositions 100.00%     100.00%
Senior Notes [Member] | 6.625% Senior Notes Due May 2023 [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 1,350      
Senior Notes [Member] | 7.00% Senior Notes Due May 2025 [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross 750      
Debt Instrument, face amount $ 507      
Senior Notes [Member] | Senior Notes 6.125% Due May 2023 [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 395 € 360 € 360