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Borrowings (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Borrowings    
Fixed-rate debt $ 18,547 $ 14,446
Floating-rate debt 8,614 11,417
Fixed-rate debt, Average Rate (as a percent) 4.38% 5.29%
Floating-rate debt, Average Rate (as a percent) 1.54% 1.23%
Long-Term Debt, including current portion 27,161 25,863
Notional interest rate swaps that effectively convert the fixed-rate long-term debt into floating-rate debt 5,898 7,078
Pre-swap annual contractual maturities of long-term debt outstanding    
2012 4,311  
2013 5,495  
2014 3,763  
2015 197  
2016 3,009  
2017 and beyond 9,926  
Total $ 26,702