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Summary of Significant Accounting Policies - Various Policies (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / bbl | Feb. 29, 2016 $ / bbl | Jun. 30, 2014 $ / bbl | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Foreign Currency Transactions |  |  |  |  |  |
Gain (loss) on revaluation of foreign currency transactions and monetary assets and liabilities |  |  |  | $ 21 | $ (8) | $ 21
Cash and Cash Equivalents |  |  |  |  |  |
Outstanding checks included in accounts payable that were reclassified from cash and cash equivalents | $ 60 |  |  | 60 | 66 |
Accounts Receivable |  |  |  |  |  |
NYMEX WTI oil price (in dollars per bbl) | $ / bbl | 60.42 |  |  |  |  |
Advance cash payments received from third parties to mitigate credit risk | $ 117 |  |  | 117 | 89 |
Standby letters of credit | 54 |  |  | $ 54 | $ 66 |
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 |  |  | $ 3 | $ 3 |
Asset Retirement Obligations |  |  |  |  |  |
Fair value of asset retirement obligations | $ 103 |  |  | $ 103 | $ 44 |
Maximum |  |  |  |  |  |
Accounts Receivable |  |  |  |  |  |
NYMEX WTI oil price (in dollars per bbl) | $ / bbl |  |  | 107.26 |  |  |
Minimum |  |  |  |  |  |
Accounts Receivable |  |  |  |  |  |
NYMEX WTI oil price (in dollars per bbl) | $ / bbl |  | 26.21 |  |  |  |

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