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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Foreign Currency Transactions |  |  |
Gain (loss) on revaluation of foreign currency transactions and monetary assets and liabilities | $ (2) | $ (2) | $ 2
Cash and Cash Equivalents |  |  |
Maximum original maturity period of cash equivalent investments | 3 months |  |
Outstanding checks that were reclassified from cash and cash equivalents to be included in accounts payable | 72 | 58 |
Accounts Receivable |  |  |
Advance cash payments received from third parties to mitigate credit risk | 173 | 186 |
Net accounts receivable, maximum age of balances past their scheduled invoice date | 30 days | 30 days |
Allowance for doubtful accounts receivable | $ 4 | $ 5 |

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