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Borrowings (Details 3) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Borrowings    
Long-Term Debt, including current portion $ 38,367us-gaap_LongTermDebt $ 39,675us-gaap_LongTermDebt
Less: current maturities 4,072us-gaap_LongTermDebtCurrent 4,601us-gaap_LongTermDebtCurrent
Total long-term debt (excluding current portion) $ 34,295us-gaap_LongTermDebtNoncurrent $ 35,073us-gaap_LongTermDebtNoncurrent