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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Contributions by Employer | $ 12 | $ 12 | $ 12 |
| X | ||||||||||
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- Definition
The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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