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Intangible Assets (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets (Textual) [Abstract]
Amortization Expense Associated With Finite Lived Intangible Assets Amortization Expense	$ 8	$ 8	$ 3
Customer relationship intangibles [Member] \| Minimum [Member]
Intangible Assets (Textual) [Abstract]
Estimated useful lives	10 years
Customer relationship intangibles [Member] \| Maximum [Member]
Intangible Assets (Textual) [Abstract]
Estimated useful lives	16 years

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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