v2.3.0.15

Goodwill and Intangible Assets (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 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

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Aggregate amount of intangible asset amortization recognized as expense during the period.

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The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

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