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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current income taxes: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  | $ 19 |  | $ 40 |  | $ 737 |
Foreign |  |  |  |  |  | (428) |  | (423) |  | (415) |
State |  |  |  |  |  | (15) |  | (14) |  | 35 |
Total current |  |  |  |  |  | 424 |  | 397 |  | (357) |
Deferred income taxes: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  | 286 |  | (678) |  | 1,343 |
Foreign |  |  |  |  |  | 9 |  | (31) |  | 77 |
State |  |  |  |  |  | (28) |  | (25) |  | 81 |
Total deferred |  |  |  |  |  | 267 |  | (734) |  | 1,501 |
Income tax benefit (provision) |  | $ 306 |  |  |  | (157) |  | (1,131) |  | 1,858 |
The United States and foreign components of income from continuing operations before income taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  | 1,097 |  | 694 |  | (6,636) |
Foreign |  |  |  |  |  | 717 |  | (12) |  | (989) |
Income (loss) from continuing operations before income taxes |  |  |  |  |  | $ 1,814 |  | $ 682 |  | $ (7,625) |
Reconciliations between the actual provision for income taxes on continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
United States statutory rate |  |  |  |  |  | 21.00% |  | 35.00% |  | 35.00% |
Impact of U.S. tax reform |  |  |  |  |  | (2.60%) |  | 113.00% |  | 0.00% |
Venezuela adjustment |  |  |  |  |  | 5.70% |  | 36.60% |  | 0.00% |
Impact of foreign income taxed at different rates |  |  |  |  |  | (3.00%) |  | (18.30%) |  | (3.20%) |
Valuation allowance against tax assets |  |  |  |  |  | (16.20%) |  | (6.20%) |  | (2.10%) |
Undistributed foreign earnings |  |  |  |  |  | 0.00% |  | 3.80% |  | (5.10%) |
Adjustments of prior year taxes |  |  |  |  |  | 2.00% |  | (2.30%) |  | 0.20% |
State income taxes |  |  |  |  |  | 1.90% |  | 1.70% |  | 1.00% |
Domestic manufacturing deduction |  |  |  |  |  | 0.00% |  | 0.00% |  | (1.30%) |
Non-deductible acquisition costs |  |  |  |  |  | 0.00% |  | 0.00% |  | 0.60% |
Other items, net |  |  |  |  |  | (0.10%) |  | 2.50% |  | (0.70%) |
Total effective tax rate on continuing operations |  |  |  |  |  | 8.70% |  | 165.80% |  | 24.40% |
Impairments and other charges | [1] |  |  |  |  | $ 265 |  | $ 647 |  | $ 3,357 |
Gross deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 1,466 |  |  |  | 1,466 |  | 1,370 |  |  |
Foreign tax credit carryforwards |  | 728 |  |  |  | 728 |  | 828 |  |  |
Employee compensation and benefits |  | 242 |  |  |  | 242 |  | 263 |  |  |
Accrued Liabilities |  | 101 |  |  |  | 101 |  | 97 |  |  |
Other |  | 404 |  |  |  | 404 |  | 416 |  |  |
Total gross deferred tax assets |  | 2,941 |  |  |  | 2,941 |  | 2,974 |  |  |
Gross deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 635 |  |  |  | 635 |  | 315 |  |  |
Undistributed Foreign Earnings |  | 2 |  |  |  | 2 |  | 242 |  |  |
Other |  | 64 |  |  |  | 64 |  | 56 |  |  |
Total gross deferred tax liabilities |  | 701 |  |  |  | 701 |  | 613 |  |  |
Valuation allowances |  | 913 |  |  |  | 913 |  | 1,173 |  |  |
Net deferred income tax asset |  | 1,327 |  |  |  | 1,327 |  | 1,188 |  |  |
Unrecognized Tax Benefits |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 333 | [2] | 333 | [2] | 427 |  | 322 |
Change in prior year tax positions |  |  |  |  |  | 32 |  |  |  | 44 |
Change in prior year tax positions |  |  |  |  |  |  |  | (108) |  |  |
Change in current year tax positions |  |  |  |  |  | 63 |  | 24 |  | 129 |
Cash settlements with taxing authorities |  |  |  |  |  | (7) |  | (6) |  | (62) |
Lapse of statute of limitations |  |  |  |  |  | (4) |  | (4) |  | (6) |
Ending balance |  | 417 | [2],[3] |  |  | 417 | [2],[3] | 333 | [2] | 427 |
Interest and Penalties |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 60 |  | 60 |  | 61 |  | 47 |
Change in prior year tax positions |  |  |  |  |  | 11 |  | 0 |  | 20 |
Change in current year tax positions |  |  |  |  |  | 0 |  | 2 |  | 3 |
Cash settlements with taxing authorities |  |  |  |  |  | (2) |  | 0 |  | (8) |
Lapse of statute of limitations |  |  |  |  |  | (2) |  | (3) |  | (1) |
Ending balance |  | 67 |  |  |  | 67 |  | 60 |  | 61 |
Remaining balance if resolved in our favor would positively impact the effective tax rate |  | 399 |  |  |  | 399 |  | 319 |  |  |
Portion of unrecognized tax benefits that could be resolved within the next 12 months |  | 21 |  |  |  | 21 |  |  |  |  |
Impairments and other charges |  |  |  | 265 |  | 265 |  | 647 |  | $ 3,357 | [1]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | 47 |  |  |  |  |  |  |  |  |
Foreign Country |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 1,500 |  |  |  | 1,500 |  |  |  |  |
Years 2018-2022 [Domain] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 168 |  |  |  | 168 |  |  |  |  |
Years 2024-2028 [Domain] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 180 |  |  |  | 180 |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research and Foreign That Expire |  | 805 |  |  |  | 805 |  |  |  |  |
Years 2029-2038 [Domain] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 786 |  |  |  | 786 |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research and Foreign That Expire |  | 138 |  |  |  | 138 |  |  |  |  |
VENEZUELA |  |  |  |  |  |  |  |  |  |  |
Reconciliations between the actual provision for income taxes on continuing operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairments and other charges | [1] |  |  |  |  |  |  | 647 |  |  |
Interest and Penalties |  |  |  |  |  |  |  |  |  |  |
Accrued taxes portion of Venezuela investment write-down |  |  |  | $ 47 |  |  |  |  |  |  |
All Other Countries [Domain] |  |  |  |  |  |  |  |  |  |  |
Interest and Penalties |  |  |  |  |  |  |  |  |  |  |
Remaining balance if resolved in our favor would positively impact the effective tax rate |  | $ 18 |  |  |  | $ 18 |  | $ 9 |  |  |
[1] | Impairments and other charges are as follows: -For the year ended December 31, 2018, the aggregate charge of $265 million represents a write-down of all of our remaining investment in Venezuela, consisting of receivables, fixed assets, inventory and other assets and liabilities. -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, the aggregate charge of $3.4 billion consisted of fixed asset impairments and write-offs, inventory write-downs, impairments of intangible assets, severance costs, country and facility closures, and other charges related to the energy downturn. This included $2.1 billion attributable to Completion and Production, $1.2 billion attributable to Drilling and Evaluation and $10 million attributable to Corporate and other.
[2] | Includes $18 million as of December 31, 2018 and $9 million as of December 31, 2017 in foreign unrecognized tax benefits that would give rise to a United States tax credit. As of December 31, 2018 and December 31, 2017, approximately $399 million and $319 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.
[3] | Includes $21 million that could be resolved within the next 12 months.

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