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Borrowings (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Sep. 30, 2016
Debt Instrument [Line Items]    
Short-term borrowings $ 49,860 $ 31,571
Unamortized Debt Issuance Costs 674  
Borrowings Reclassification Related To Unamortized Debt Issuance Costs [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 33  
Long-term borrowings $ 641