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Debt - Maturities and Covenants (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Debt      
Weighted-average maturity of long-term debt 11 years    
Maturities      
2016 $ 847    
2017 400    
2018 600    
2019 850    
2020 500    
Thereafter 7,255    
Credit agreements and commercial paper program      
Maturities      
Total borrowings 62,200 $ 70,900 $ 31,000
Total repayments $ 61,300 71,300 $ 31,000
Credit agreements      
Maturities      
Coverage ratio of debt-to-EBITDA, maximum 5.00    
Ratio of debt-to-EBITDA during acquisition period, maximum 5.50    
Acquisition period 9 months    
Threshold for acquisition period qualification $ 150    
Debt Covenant Compliance As of December 31, 2015, we were in compliance with the covenants contained in our credit agreements and indentures.    
Letters of credit      
Maturities      
Outstanding letters of credit $ 46 $ 87  
Letters of credit | Maximum      
Maturities      
Periods for which letters of credit are issued 70 days