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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current income taxes: |  |  |  |  |  |  |  |  |  |
Current Federal Tax Expense (Benefit) |  |  |  |  |  | $ 40 |  | $ 737 |  | $ 635
Current Foreign Tax Expense (Benefit) |  |  |  |  |  | (423) |  | (415) |  | (636)
Current State Tax Expense (Benefit) |  |  |  |  |  | (14) |  | 35 |  | 51
Total current |  |  |  |  |  | 397 |  | (357) |  | (50)
Deferred income taxes: |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  | (678) |  | 1,343 |  | (18)
Foreign |  |  |  |  |  | (31) |  | 77 |  | 262
State |  |  |  |  |  | (25) |  | 81 |  | (20)
Total deferred |  |  |  |  |  | (734) |  | 1,501 |  | 224
Income tax benefit (provision) |  |  |  |  |  | (1,131) |  | 1,858 |  | 274
The United States and foreign components of income from continuing operations before income taxes [Abstract] |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  | 694 |  | (6,636) |  | (1,560)
Foreign |  |  |  |  |  | (12) |  | (989) |  | 624
Income (loss) from continuing operations before income taxes |  |  |  |  |  | $ 682 |  | $ (7,625) |  | $ (936)
Reconciliations between the actual provision for income taxes on continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |
United States statutory rate |  |  |  |  |  | 35.00% |  | 35.00% |  | 35.00%
Impact of U.S. tax reform |  |  |  |  |  | 113.00% |  | 0.00% |  | 0.00%
Venezuela receivables adjustments |  |  |  |  |  | 36.60% |  | (0.00%) |  | (7.50%)
Impact of foreign income taxed at different rates |  |  |  |  |  | (18.30%) |  | (3.20%) |  | 17.00%
Valuation allowance against tax assets |  |  |  |  |  | (6.20%) |  | (2.10%) |  | (8.30%)
Undistributed foreign earnings |  |  |  |  |  | 3.80% |  | (5.10%) |  | 0.00%
Adjustments of prior year taxes |  |  |  |  |  | (2.30%) |  | 0.20% |  | 1.30%
State income taxes |  |  |  |  |  | 1.70% |  | 1.00% |  | 2.00%
Domestic manufacturing deduction |  |  |  |  |  | 0.00% |  | (1.30%) |  | 0.00%
Non-deductible acquisition costs |  |  |  |  |  | 0.00% |  | 0.60% |  | (4.50%)
Other items, net |  |  |  |  |  | 2.50% |  | (0.70%) |  | (5.70%)
Total effective tax rate on continuing operations |  |  |  |  |  | 165.80% |  | 24.40% |  | 29.30%
Impairments and other charges | [1] |  |  |  |  | $ 647 |  | $ 3,357 |  | $ 2,177
Gross deferred tax assets: |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ 1,370 |  |  |  | 1,370 |  | 1,647 |  |
Foreign tax credit carryforwards |  | 828 |  |  |  | 828 |  | 648 |  |
Employee compensation and benefits |  | 263 |  |  |  | 263 |  | 352 |  |
Accrued Liabilities |  | 97 |  |  |  | 97 |  | 325 |  |
Other |  | 416 |  |  |  | 416 |  | 536 |  |
Total gross deferred tax assets |  | 2,974 |  |  |  | 2,974 |  | 3,508 |  |
Gross deferred tax liabilities: |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 315 |  |  |  | 315 |  | 585 |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  | 242 |  |  |  | 242 |  | 406 |  |
Other |  | 56 |  |  |  | 56 |  | 145 |  |
Total gross deferred tax liabilities |  | 613 |  |  |  | 613 |  | 1,136 |  |
Valuation allowances |  | 1,173 |  |  |  | 1,173 |  | 453 |  |
Net deferred income tax asset |  | 1,188 |  |  |  | 1,188 |  | 1,919 |  |
Unrecognized Tax Benefits |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 333 | [2],[3] | 427 | [3] | 322 |  | 314
Change in prior year tax positions |  |  |  |  |  | (108) |  |  |  | (33)
Change in prior year tax positions |  |  |  |  |  |  |  | 44 |  |
Change in current year tax positions |  |  |  |  |  | 24 |  | 129 |  | 62
Cash settlements with taxing authorities |  |  |  |  |  | (6) |  | (62) |  | (16)
Lapse of statute of limitations |  |  |  |  |  | (4) |  | (6) |  | (5)
Ending balance |  | 333 | [2],[3] |  |  | 333 | [2],[3] | 427 | [3] | 322
Interest and Penalties |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 60 |  | 61 |  | 47 |  | 56
Change in prior year tax positions |  |  |  |  |  | 0 |  | 20 |  | 7
Change in current year tax positions |  |  |  |  |  | 2 |  | 3 |  | 1
Cash settlements with taxing authorities |  |  |  |  |  | 0 |  | (8) |  | (15)
Lapse of statute of limitations |  |  |  |  |  | (3) |  | (1) |  | (2)
Ending balance |  | 60 |  |  |  | 60 |  | 61 |  | $ 47
Remaining balance if resolved in our favor would positively impact the effective tax rate |  | 319 |  |  |  | 319 |  | 257 |  |
Portion of unrecognized tax benefits that could be resolved within the next 12 months |  | 23 |  |  |  | 23 |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | 283 |  |  |  | 770 |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | 305 |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | 130 |  |  |  |  |  |  |  |
Tax Credit Carryforward, Valuation Allowance |  | 575 |  |  |  | 575 |  |  |  |
Other Deductions or Allowable Credits |  | 40 |  |  |  | 40 |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |  |
Gross deferred tax liabilities: |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  | 435 |  |  |  | 435 |  |  |  |
Foreign Country |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 1,400 |  |  |  | 1,400 |  |  |  |
Years 2018-2022 [Domain] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 161 |  |  |  | 161 |  |  |  |
Years 2023-2027 [Domain] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 160 |  |  |  | 160 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research and Foreign That Expire |  | 911 |  |  |  | 911 |  |  |  |
Years 2028-2037 [Domain] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 693 |  |  |  | 693 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research and Foreign That Expire |  | 102 |  |  |  | 102 |  |  |  |
VENEZUELA |  |  |  |  |  |  |  |  |  |
Reconciliations between the actual provision for income taxes on continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |
Impairments and other charges | [1] |  |  |  |  | 647 |  |  |  |
All Other Countries [Domain] |  |  |  |  |  |  |  |  |  |
Interest and Penalties |  |  |  |  |  |  |  |  |  |
Remaining balance if resolved in our favor would positively impact the effective tax rate |  | $ 9 |  |  |  | $ 9 |  | $ 84 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Reconciliations between the actual provision for income taxes on continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |
United States statutory rate |  |  |  | 21.00% |  |  |  |  |  |
[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.
[2] | Includes $23 million that could be resolved within the next 12 months.
[3] | Includes $9 million as of December 31, 2017 and $84 million as of December 31, 2016 in foreign unrecognized tax benefits that would give rise to a United States tax credit. As of December 31, 2017 and December 31, 2016, approximately $319 million and $257 million, respectively, of unrecognized tax benefits would positively impact the effective tax rate and be recognized as additional tax benefits in our statement of operations if resolved in our favor.

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75018887&loc=d3e30536-109315 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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