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Related Party Transactions (Schedule of Related Party Receivables Payables) (Details) - Affiliated Entity - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Related Party Transaction [Line Items] |  |
Receivables from Related Parties | $ 250 | $ 218
Accounts and notes payable to related parties | $ 727 | $ 892

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