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Receivables (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) Countries Customers | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) Countries Customers | Dec. 31, 2016 USD ($) Countries Customers | Dec. 31, 2015 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |
Venezuela trade receivables exchanged for promissory note |  |  |  | $ 200 |  |  |
Pre-tax loss on promissory note |  |  | $ 262 | 148 |  |  |
Impairments and other charges | [1] |  |  |  | $ 647 | $ 3,357 | $ 2,177
Maximum Percentage Gross Trade Receivables From One Geographic Segment |  | 10.00% |  |  | 10.00% | 10.00% |
Maximum Percentage Gross Trade Receivables From One Customer |  | 10.00% |  |  | 10.00% | 10.00% |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | $ 175 | $ 145 | 137
Charged to Costs and Expenses |  |  |  |  | 568 | 50 | 44
Write-Offs |  |  |  |  | (18) | (20) | (36)
Balance at End of Period |  | $ 725 |  |  | $ 725 | $ 175 | $ 145
NumberOfCountriesExceedReceivablesThreshold | Countries |  | 1 |  |  | 1 | 2 |
NumberOfCustomersExceedReceivablesThreshold | Customers |  | 0 |  |  | 0 | 0 |
Venezuela Net Investment |  | $ 202 |  |  | $ 202 |  |
Geographic Concentration Risk | UNITED STATES | Accounts Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage (in hundredths) |  |  |  |  | 42.00% | 27.00% |
VENEZUELA |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Net |  | 117 |  |  | $ 117 | $ 610 |
Venezuela promissory note, carrying value |  | 32 |  |  | 32 | $ 70 |
Venezuela aggregate charges |  | 385 |  |  |  |  |
Assets, Fair Value Adjustment |  | 77 |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Write-offs |  |  |  |  | 308 |  |
Impairments and other charges | [1] |  |  |  | 647 |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Venezuela promissory note, par value |  | 175 |  | $ 200 | 175 |  |
VENEZUELA | Accounts Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage (in hundredths) |  |  |  |  |  | 15.00% |
Other assets | VENEZUELA |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Venezuela promissory note, carrying value |  | $ 32 |  |  | $ 32 |  |
[1] | Impairments and other charges are as follows:-For the year ended December 31, 2017, the aggregate charge of $647 million represents a fair market value adjustment on our existing promissory note with our primary customer in Venezuela and a full reserve against our other accounts receivable with this customer. -For the year ended December 31, 2016, includes $2.1 billion attributable to Completion and Production, $1.2 billion attributable to Drilling and Evaluation and $10 million attributable to Corporate and other. -For the year ended December 31, 2015, includes $1.1 billion attributable to Completion and Production, $1.0 billion attributable to Drilling and Evaluation and $88 million attributable to Corporate and other.

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