XML 181 R169.htm IDEA: XBRL DOCUMENT
v3.20.4

Pension benefits - Assumptions Used in Calculation of Pension Obligations (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Retirement Benefits [Abstract] |  |  |  |
Rate of compensation increase at the end of year (as percent) | 2.75% | 2.50% | 2.25% | 2.25%
Discount rate at the end of year (as percent) | 2.60% | 2.40% | 1.70% | 2.30%
Prescribed pension index factor (as percent) | 2.00% | 2.00% | 1.20% | 2.00%
Expected return on plan assets for the year (as percent) | 2.60% | 2.40% | 2.60% | 2.60%
Employee turnover (as percent) | 4.00% | 4.00% | 4.00% | 4.00%
Expected increases in Social Security Base (as percent) | 2.50% | 2.25% | 2.00% | 2.50%

X
- Definition The employee turnover rate assumed in the calculation of pension obligations. + References No definition available. + Details
Name: | sdrl_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostEmployeeTurnover
Namespace Prefix: | sdrl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The prescribed pension index factor assumed in the calculation of pension obligations. + References No definition available. + Details
Name: | sdrl_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostPrescribedPensionIndexFactor
Namespace Prefix: | sdrl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The expected increase (decrease) in the social security base assumed in the calculation of pension obligations. + References No definition available. + Details
Name: | sdrl_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostSocialSecurity
Namespace Prefix: | sdrl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration