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Long-Term Debt (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Maturities of Long-term Debt [Abstract]    
2012 $ 7,046  
2013 3,338  
2014 4,158  
2015 3,041  
2016 4,016  
Thereafter 10,354  
Long-term debt 31,953 31,537
Parent Company [Member]
   
Maturities of Long-term Debt [Abstract]    
2012 2,672  
2013 2,848  
2014 1,499  
2015 1,747  
2016 1,945  
Thereafter 3,882  
Long-term debt $ 14,593 $ 13,037