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Related Party Transactions - Ship Finance Transactions - Additional Information (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Long-term debt due to related parties	$ 294,000,000		$ 314,000,000
Short-term debt to related parties	4,000,000		10,000,000
Interest expense	(38,000,000)	$ (195,000,000)
Ship Finance International Ltd VIEs [Member]
Related Party Transaction [Line Items]
Short-term debt to related parties			0
Ship Finance International Ltd VIEs [Member] | Ship Finance International Ltd VIEs [Member]
Related Party Transaction [Line Items]
Long-term debt due to related parties	294,000,000		314,000,000
Gross loans outstanding	318,000,000		314,000,000
Short-term debt to related parties	$ 20,000,000
Interest rate on related party debt	4.50%
Interest expense	$ 7,000,000		$ 9,300,000
Minimum [Member] | Ship Finance International Ltd VIEs [Member] | Ship Finance International Ltd VIEs [Member]
Related Party Transaction [Line Items]
Debt instrument maturity date	Dec. 31, 2023
Maximum [Member] | Ship Finance International Ltd VIEs [Member] | Ship Finance International Ltd VIEs [Member]
Related Party Transaction [Line Items]
Debt instrument maturity date	Dec. 31, 2029

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 235
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Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

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The net amount of operating interest income (expense).

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