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Debt of The Company (Details) - Unsecured senior notes
Dec. 31, 2017
5.875% notes due 2020  
Debt Instrument [Line Items]  
Interest rate 5.875%
3.400% notes due 2020  
Debt Instrument [Line Items]  
Interest rate 3.40%
5.250% notes due 2021  
Debt Instrument [Line Items]  
Interest rate 5.25%
3.950% notes due 2022  
Debt Instrument [Line Items]  
Interest rate 3.95%
3.625% notes due 2022  
Debt Instrument [Line Items]  
Interest rate 3.625%
2.750% notes due 2023  
Debt Instrument [Line Items]  
Interest rate 2.75%
4.750% notes due 2025  
Debt Instrument [Line Items]  
Interest rate 4.75%
3.700% notes due 2027  
Debt Instrument [Line Items]  
Interest rate 3.70%
4.750% notes due 2023  
Debt Instrument [Line Items]  
Interest rate 4.75%
2.750% notes due 2024  
Debt Instrument [Line Items]  
Interest rate 2.75%
4.250% notes due 2025  
Debt Instrument [Line Items]  
Interest rate 4.25%
3.300% notes due 2029  
Debt Instrument [Line Items]  
Interest rate 3.30%
2.625% notes due 2024  
Debt Instrument [Line Items]  
Interest rate 2.625%