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Long-term Debt - Summary of Long-term Debt (Details)
$ in Millions
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Principal amount at par   $ 8,409  
Senior Notes | 5.375% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   500  
Fair value   $ 515 $ 530
Interest rate 5.375% 5.375%  
Senior Notes | 5.50% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   $ 700  
Fair value   $ 724 739
Interest rate 5.50% 5.50%  
Senior Notes | 5.750% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   $ 400  
Fair value   $ 411 427
Interest rate 5.75% 5.75%  
Senior Notes | 5.875% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   $ 800  
Fair value   $ 828 856
Interest rate 5.875% 5.875%  
Senior Notes | 4.375% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   $ 1,000  
Fair value   $ 942 983
Interest rate 4.375% 4.375%  
Senior Notes | 3.625% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par € 1,300,000,000 $ 1,509  
Fair value   $ 1,491 1,575
Interest rate 3.625% 3.625%  
Senior Notes | 4.875% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   $ 1,600  
Fair value   $ 1,504 1,571
Interest rate 4.875% 4.875%  
Senior Notes | 5.875% Senior Notes      
Debt Instrument [Line Items]      
Principal amount at par   $ 1,900  
Fair value   $ 1,901 $ 0
Interest rate 5.875% 5.875%