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Fair Value Disclosure (Fair Value, By Balance Sheet Grouping) (Details) (USD $)
In Millions
Sep. 30, 2011
Successor [Member]
Carrying Amount [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2011
Successor [Member]
Carrying Amount [Member]
Fair Value Inputs, Level 2 [Member]
Dec. 31, 2010
Predecessor [Member]
Carrying Amount [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2010
Predecessor [Member]
Carrying Amount [Member]
Fair Value Inputs, Level 2 [Member]
Sep. 30, 2011
Successor [Member]
Fair Value [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2011
Successor [Member]
Fair Value [Member]
Fair Value Inputs, Level 2 [Member]
Dec. 31, 2010
Predecessor [Member]
Fair Value [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2010
Predecessor [Member]
Fair Value [Member]
Fair Value Inputs, Level 2 [Member]
Assets-Investment securities  $ 92   $ 92 
Liabilities-Long-term debt excluding capital lease obligations $ 12,570 $ 11,583 $ 12,087 $ 12,480