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Debt - Maturities and Covenants (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt      
Weighted-average maturity of long-term debt 11 years    
Maturities      
2017 $ 247    
2018 600    
2019 850    
2020 500    
2021 600    
Thereafter $ 7,403    
Acquisition Period 9 months    
Credit agreements and commercial paper program      
Maturities      
Total borrowings $ 60,300 $ 62,200 $ 70,900
Total repayments $ 61,000 61,300 $ 71,300
Credit agreements      
Maturities      
Coverage ratio of debt-to-EBITDA, maximum 5.00    
Ratio of debt-to-EBITDA during acquisition period, maximum 5.50    
Threshold for acquisition period qualification $ 150    
Debt covenant compliance As of December 31, 2016, we were in compliance with the covenants contained in our credit agreements and indentures.    
Letters of credit      
Maturities      
Outstanding letters of credit $ 73 $ 46  
Letters of credit | Maximum      
Maturities      
Periods for which letters of credit are issued 70 days