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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Components of the provision (benefit) for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31, |
​ |  | 2019 |  | 2018 |  | 2017 |
Current tax expense (benefit) |  | $ | (189) | ​ | $ | 244 | ​ | $ | 5 | ​
Deferred tax expense (benefit) | ​ | ​ | 248 | ​ | ​ | (16) | ​ | ​ | 89 | ​
Income tax expense |  | $ | 59 | ​ | $ | 228 | ​ | $ | 94 | ​
Reconciliation of the differences between income tax expense computed at the Swiss holding company statutory rate and the reported provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31, |
​ |  | 2019 |  | 2018 |  | 2017 |
Income tax benefit at Swiss federal statutory rate |  | $ | (94) | ​ | $ | (139) | ​ | $ | (235) | ​
Earnings subject to rates different than the Swiss federal statutory rate | ​ | ​ | 189 | ​ | ​ | (86) | ​ | ​ | (30) | ​
Effect of operating structural changes in the U.S. | ​ | ​ | 98 | ​ | ​ | — | ​ | ​ | — | ​
Changes in valuation allowance | ​ | ​ | 37 | ​ | ​ | 67 | ​ | ​ | 162 | ​
Losses on impairment | ​ | ​ | 35 | ​ | ​ | 114 | ​ | ​ | 241 | ​
Deemed profits taxes | ​ | ​ | 22 | ​ | ​ | 8 | ​ | ​ | 16 | ​
Base erosion and anti-abuse tax | ​ | ​ | 21 | ​ | ​ | 33 | ​ | ​ | — | ​
Withholding taxes | ​ | ​ | 11 | ​ | ​ | 8 | ​ | ​ | 14 | ​
Currency revaluation of Norwegian assets | ​ | ​ | 5 | ​ | ​ | 11 | ​ | ​ | 1 | ​
Effect of U.S. tax reform | ​ | ​ | — | ​ | ​ | 104 | ​ | ​ | 66 | ​
Litigation matters, primarily related to the Macondo well incident | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (70) | ​
Benefit from foreign tax credits | ​ | ​ | (8) | ​ | ​ | (5) | ​ | ​ | (15) | ​
Changes in unrecognized tax benefits, net | ​ | ​ | (268) | ​ | ​ | 117 | ​ | ​ | (56) | ​
Other, net | ​ | ​ | 11 | ​ | ​ | (4) | ​ | ​ | — | ​
Income tax expense |  | $ | 59 | ​ | $ | 228 | ​ | $ | 94 | ​
Significant components of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2019 |  | 2018 |
Deferred tax assets | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforwards |  | $ | 571 | ​ | $ | 479 | ​
Interest expense limitation | ​ | ​ | 77 | ​ | ​ | 76 | ​
Accrued payroll expenses not currently deductible | ​ | ​ | 45 | ​ | ​ | 49 | ​
Deferred income | ​ | ​ | 41 | ​ | ​ | 26 | ​
Loss contingencies | ​ | ​ | 38 | ​ | ​ | 40 | ​
United Kingdom charter limitation | ​ | ​ | 36 | ​ | ​ | 30 | ​
Tax credit carryforwards | ​ | ​ | 22 | ​ | ​ | 11 | ​
Accrued expenses | ​ | ​ | 16 | ​ | ​ | 44 | ​
Other | ​ | ​ | 24 | ​ | ​ | 13 | ​
Valuation allowance | ​ | ​ | (716) | ​ | ​ | (681) | ​
Total deferred tax assets | ​ | ​ | 154 | ​ | ​ | 87 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation | ​ | ​ | (361) | ​ | ​ | (62) | ​
Contract intangible amortization | ​ | ​ | (23) | ​ | ​ | (22) | ​
Other | ​ | ​ | (16) | ​ | ​ | (1) | ​
Total deferred tax liabilities | ​ | ​ | (400) | ​ | ​ | (85) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets (liabilities), net |  | $ | (246) | ​ | $ | 2 | ​
Reconciliation of unrecognized tax benefits, excluding interest and penalties | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31, |
​ |  | ​ | 2019 |  | ​ | 2018 |  | ​ | 2017 |
Balance, beginning of period |  | $ | 408 | ​ | $ | 222 | ​ | $ | 274 | ​
Additions for prior year tax positions | ​ | ​ | 6 | ​ | ​ | 172 | ​ | ​ | 17 | ​
Additions for current year tax positions | ​ | ​ | 144 | ​ | ​ | 29 | ​ | ​ | 13 | ​
Reductions related to statute of limitation expirations and changes in law | ​ | ​ | (138) | ​ | ​ | (8) | ​ | ​ | (13) | ​
Reductions for prior year tax positions | ​ | ​ | (66) | ​ | ​ | (7) | ​ | ​ | (68) | ​
Reductions due to settlements | ​ | ​ | (19) | ​ | ​ | — | ​ | ​ | (1) | ​
Balance, end of period |  | $ | 335 | ​ | $ | 408 | ​ | $ | 222 | ​
Schedule of unrecognized tax benefits, including related interest and penalties | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ | ​ | ​ | 2019 |  | ​ | 2018 |
Unrecognized tax benefits, excluding interest and penalties | ​ | $ | 335 | ​ | $ | 408 | ​
Interest and penalties | ​ | ​ | 34 | ​ | ​ | 106 | ​
Unrecognized tax benefits, including interest and penalties | ​ | $ | 369 | ​ | $ | 514 | ​

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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