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Summary of Significant Accounting Policies - Various Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Foreign Currency Transactions |  |  |
Gain (loss) on revaluation of foreign currency transactions and monetary assets and liabilities | $ (8) | $ 21 | $ (13)
Cash and Cash Equivalents |  |  |
Outstanding checks included in accounts payable that were reclassified from cash and cash equivalents | 66 | 60 |
Accounts Receivable |  |  |
Advance cash payments received from third parties to mitigate credit risk | 89 | 88 |
Standby letters of credit | $ 66 | $ 36 |
Substantially all trade accounts receivable, net, maximum age of balances past their scheduled invoice date | 30 days | 30 days |
Allowance for doubtful accounts receivable | $ 3 | $ 4 |
Asset Retirement Obligations |  |  |
Fair value of asset retirement obligations | $ 44 | $ 35 |

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