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Goodwill and Intangible Assets (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Year
Swap
Segment
Dec. 31, 2011
Goodwill and Intangible Assets (Textuals) [Abstract]   
Minimum estimated useful lives of intangible assets 2 
Maximum estimated useful lives of intangible assets 20 
Minimum economic benefits of intangible assets are expected to be realized 15 years 
Maximum economic benefits of intangible assets are expected to be realized 30 years 
Amortization expense for intangible assets included in net income$ 25$ 71 
Remaining amortization for remainder of year  24
Estimated amortization expense for the year 2012 94 
Estimated amortization expense for the year 2013 93 
Estimated amortization expense for the year 2014 92 
Estimated amortization expense for the year 2015 90 
Estimated amortization expense for the year 2016 $ 89