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Other Financial Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid expenses | $ 47 | $ 64
Other | 79 | 50
Total other current assets | 126 | 114
Accounts payable | 440 | 456
Capital expenditures incurred but not yet paid | $ 11 | $ 27

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