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Pension benefits - Additional Information (Details) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 plan | Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  |  | $ 15 | $ 37
Number of defined benefit plans terminated | plan | 2 |  |  |  |
Total company contributions |  | $ 9 | $ 10 | $ 18 | $ 16
Onshore Employees |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Retirement pension as a percent of salary (as percent) |  |  |  | 66.00% |
Retirement age |  |  |  | 67 years |
Retirement pension cap (as percent) |  |  |  | 66.00% |
Multiple of base |  |  |  | 12 |
Retirement age to receive pre-retirement pension |  |  |  | 62 years |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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