Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Stock-Based Compensation Allocated To Selling, General And Administrative Expenses) (Details)

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Stock-Based Compensation (Stock-Based Compensation Allocated To Selling, General And Administrative Expenses) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Stock-based compensation allocated to selling, general, and administrative $ 17 $ 16