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Debt, Credit Facilities, and Commitments and Contingencies (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Short-Term Borrowings      
Lease expense $ 146 $ 115 $ 107
Short-Term Borrowings      
Short-term borrowings 406 425  
Operating leases      
2016 119    
2017 111    
2018 97    
2019 86    
2020 78    
Thereafter 519    
Total obligations and commitments 1,010    
Debt maturities and capital leases      
2016 2,025    
2017 4,024    
2018 6,025    
2019 18    
2020 3,760    
Thereafter 15,687    
Total obligations and commitments 31,539    
Fair value hedges and unamortized bond discounts (274)    
Total long-term debt and lease obligations 31,265 14,552  
Commercial Paper      
Short-Term Borrowings      
Short-term borrowings $ 400 $ 416  
Weighted-average interest rate (as a percent) 0.30% 0.20%