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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

Defined Benefit Plan, Number Of Plans Terminated

+ References

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- Definition

The multiple of the base used to determine the retirement pension cap (e.g., 12 times the Norwegian Social Security Base).

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- Definition

The minimum retirement age to draw full benefits under the defined benefit retirement pension plan.

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- Definition

The minimum retirement age to draw pre-retirement pension benefits under the defined benefit retirement pension plan.

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- Definition

The retirement pension for an employee at retirement age shown as a percentage of the employee's annual salary.

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- Definition

The retirement pension cap for an employee at retirement age shown as a percentage of the total of 12 times the Norwegian Social Security Base.

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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