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Borrowings (Details 3) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Borrowings    
Long-Term Debt, including current portion $ 37,407 $ 39,675
Less: current maturities 5,286 4,601
Total long-term debt (excluding current portion) $ 32,122 $ 35,073