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Derivative Instruments and Fair Value Measurements (Fair Value of Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Derivative Instruments and Fair Value Measurements [Abstract]    
Current maturities of long-term debt, fair value $ 1,549  
Long-term debt, fair value 4,822  
Long-term debt fair value, total 6,371  
Current maturities of long-term debt, carrying value 1,525 761 [1]
Long-term debt, carrying value 4,254 5,037 [1]
Long-term debt total, carrying value $ 5,779  
[1] * Condensed from audited financial statements.