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Stock-Based Compensation (Stock-Based Compensation Allocated To Selling, General And Administrative Expenses) (Details) (Parent Company [Member], Selling, General and Administrative Expenses, USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Parent Company [Member] | Selling, General and Administrative Expenses
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation allocated to selling, general, and administrative | $ 20 | $ 23 | $ 71 | $ 80 |