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Debt - Fair Value, Activity, Letters of Credit (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Credit facilities and commercial paper program      
Debt      
Total borrowings $ 23,000 $ 17,900  
Total repayments 23,600 $ 17,700  
Letters of credit      
Debt      
Outstanding letters of credit 48   $ 46
Senior notes      
Debt      
Debt instrument face value 9,800   9,800
Senior notes | Level 2      
Debt      
Debt instrument fair value $ 9,600   $ 8,600