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Revenues - Contract Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Contract With Customer, Asset And Liability [Line Items] |  |
General payment terms | P30D |
Trade accounts receivable arising from revenues from contracts with customers | $ 2,783 | $ 2,584
Other trade accounts receivables and other receivables | 3,674 | 3,709
Impact due to contractual rights of offset with counterparties | (3,434) | (3,264)
Trade accounts receivable and other receivables, net | 3,023 | $ 3,029
Customer Prepayments and Other |  |
Change In Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | 86 |
Amounts recognized as revenue | (70) |
Additions | 95 |
Other | (3) |
Ending balance | 108 |
Total Deferred Revenues |  |
Change In Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | 94 |
Amounts recognized as revenue | (75) |
Additions | 100 |
Other | (3) |
Ending balance | 116 |
Minimum Volume Commitments |  |
Change In Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | 8 |
Amounts recognized as revenue | (5) |
Additions | 5 |
Ending balance | $ 8 |

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