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Debt - Senior Notes (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Debt Instrument [Line Items]      
Principal amount $ 16,000 $ 16,000  
Carrying amount 15,882   $ 0
Senior Notes      
Debt Instrument [Line Items]      
Principal amount 16,000    
Unamortized discounts and debt issuance costs (118)    
Carrying amount 15,882 $ 15,900  
Senior Notes | 2017 Notes      
Debt Instrument [Line Items]      
Principal amount 1,750    
Unamortized discounts and debt issuance costs (4)    
Carrying amount $ 1,746    
Effective interest rate (percent) 1.37%    
Stated interest rate (percent) 1.20%    
Senior Notes | 2020 Notes      
Debt Instrument [Line Items]      
Principal amount $ 3,000    
Unamortized discounts and debt issuance costs (12)    
Carrying amount $ 2,988    
Effective interest rate (percent) 2.30%    
Stated interest rate (percent) 2.20%    
Senior Notes | 2022 Notes      
Debt Instrument [Line Items]      
Principal amount $ 2,250    
Unamortized discounts and debt issuance costs (12)    
Carrying amount $ 2,238    
Effective interest rate (percent) 2.89%    
Stated interest rate (percent) 2.80%    
Senior Notes | 2025 Notes      
Debt Instrument [Line Items]      
Principal amount $ 4,000    
Unamortized discounts and debt issuance costs (36)    
Carrying amount $ 3,964    
Effective interest rate (percent) 3.26%    
Stated interest rate (percent) 3.15%    
Senior Notes | 2035 Notes      
Debt Instrument [Line Items]      
Principal amount $ 1,500    
Unamortized discounts and debt issuance costs (15)    
Carrying amount $ 1,485    
Effective interest rate (percent) 4.23%    
Stated interest rate (percent) 4.15%    
Senior Notes | 2045 Notes      
Debt Instrument [Line Items]      
Principal amount $ 3,500    
Unamortized discounts and debt issuance costs (39)    
Carrying amount $ 3,461    
Effective interest rate (percent) 4.37%    
Stated interest rate (percent) 4.30%