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Related party transactions - Sale Leaseback Transaction (Details) - Ship Finance - Affiliated entity $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Related Party Transaction [Line Items]
Sale leaseback transaction, remaining lease payments	$ 540
Sale lease transaction, purchase obligation	224
Sale leaseback transaction, total commitment	764
Sale leaseback transaction, fair value	424
Sale leaseback transaction, net book value	635
West Taurus
Related Party Transaction [Line Items]
Sale leaseback transaction, remaining lease payments	0
Sale lease transaction, purchase obligation	0
Sale leaseback transaction, total commitment	0
Sale leaseback transaction, fair value	146
Sale leaseback transaction, net book value	345
West Hercules
Related Party Transaction [Line Items]
Sale leaseback transaction, remaining lease payments	167
Sale lease transaction, purchase obligation	138
Sale leaseback transaction, total commitment	305
Sale leaseback transaction, fair value	136
Sale leaseback transaction, net book value	143
West Linus
Related Party Transaction [Line Items]
Sale leaseback transaction, remaining lease payments	373
Sale lease transaction, purchase obligation	86
Sale leaseback transaction, total commitment	459
Sale leaseback transaction, fair value	142
Sale leaseback transaction, net book value	$ 147

X

- Definition

Sale Leaseback Transaction Fair Value On Initial Recognition

+ References

No definition available.

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- Definition

Sale Leaseback Transaction. Minimum Lease Payments

+ References

No definition available.

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- Definition

Sale Leaseback Transaction, Purchase Obligation

+ References

No definition available.

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- Definition

Sale Leaseback Transaction, Total Commitment

+ References

No definition available.

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- Definition

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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No definition available.

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X

- Definition

The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 51
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-Publisher FASB
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