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Debt - Key Components of Long-term Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Carrying Value $ 5,477,000,000 $ 5,475,000,000
Long-term Notes $2.5B    
Debt Instrument [Line Items]    
Debt, face amount $ 2,500,000,000  
Stated interest rate 1.875%  
Issued at Discount to Par 99.943%  
Carrying Value $ 2,499,000,000  
Long-term Notes $2.0B    
Debt Instrument [Line Items]    
Debt, face amount $ 2,000,000,000  
Stated interest rate 2.65%  
Issued at Discount to Par 99.76%  
Carrying Value $ 1,997,000,000  
Long-term Notes $1.0B    
Debt Instrument [Line Items]    
Debt, face amount $ 1,000,000,000  
Stated interest rate 3.375%  
Issued at Discount to Par 99.925%  
Carrying Value $ 1,000,000,000  
Long-term Notes $5.5B    
Debt Instrument [Line Items]    
Carrying Value 5,496,000,000  
Debt Issuance Cost $ (19,000,000)