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Debt - Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]    
Principal Amount, current $ 2,317 $ 0
Unamortized Discounts and Debt Issuance Costs, current (4) 0
Carrying Amount, current 2,313 0
Principal Amount, noncurrent 14,250 16,000
Unamortized Discounts and Debt Issuance Costs, noncurrent (112) (118)
Carrying Amount, noncurrent 14,138 15,882
Total debt, principal 16,567 16,000
Unamortized Discounts and Debt Issuance Costs (116) (118)
Carrying Amount $ 16,451 15,882
Senior Notes | 2017 Notes    
Debt Instrument [Line Items]    
Stated interest rate (percent) 1.20%  
Principal Amount, current $ 1,750 0
Unamortized Discounts and Debt Issuance Costs, current (3) 0
Carrying Amount, current 1,747 0
Principal Amount, noncurrent 0 1,750
Unamortized Discounts and Debt Issuance Costs, noncurrent 0 (4)
Carrying Amount, noncurrent $ 0 1,746
Effective Interest Rate (percent) 1.37%  
Senior Notes | 2020 Notes    
Debt Instrument [Line Items]    
Stated interest rate (percent) 2.20%  
Principal Amount, noncurrent $ 3,000 3,000
Unamortized Discounts and Debt Issuance Costs, noncurrent (12) (12)
Carrying Amount, noncurrent $ 2,988 2,988
Effective Interest Rate (percent) 2.30%  
Senior Notes | 2022 Notes    
Debt Instrument [Line Items]    
Stated interest rate (percent) 2.80%  
Principal Amount, noncurrent $ 2,250 2,250
Unamortized Discounts and Debt Issuance Costs, noncurrent (11) (12)
Carrying Amount, noncurrent $ 2,239 2,238
Effective Interest Rate (percent) 2.89%  
Senior Notes | 2025 Notes    
Debt Instrument [Line Items]    
Stated interest rate (percent) 3.15%  
Principal Amount, noncurrent $ 4,000 4,000
Unamortized Discounts and Debt Issuance Costs, noncurrent (35) (36)
Carrying Amount, noncurrent $ 3,965 3,964
Effective Interest Rate (percent) 3.26%  
Senior Notes | 2035 Notes    
Debt Instrument [Line Items]    
Stated interest rate (percent) 4.15%  
Principal Amount, noncurrent $ 1,500 1,500
Unamortized Discounts and Debt Issuance Costs, noncurrent (15) (15)
Carrying Amount, noncurrent $ 1,485 1,485
Effective Interest Rate (percent) 4.23%  
Senior Notes | 2045 Notes    
Debt Instrument [Line Items]    
Stated interest rate (percent) 4.30%  
Principal Amount, noncurrent $ 3,500 3,500
Unamortized Discounts and Debt Issuance Costs, noncurrent (39) (39)
Carrying Amount, noncurrent $ 3,461 3,461
Effective Interest Rate (percent) 4.37%  
Commercial Paper    
Debt Instrument [Line Items]    
Principal Amount, current $ 567 0
Unamortized Discounts and Debt Issuance Costs, current (1) 0
Carrying Amount, current $ 566 $ 0
Effective Interest Rate, current (percent) [1] 0.79%  
[1] Represents the weighted-average interest rate for the commercial paper outstanding at December 31, 2016.