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Variable Interest Entities (VIEs) - Assets and Liabilities in Statutory Accounts of VIEs (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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SFL Deepwater Limited [Member] |  |
Variable Interest Entity [Line Items] |  |
Investment in finance lease | $ 326 | $ 335
Amount due from related parties | 3 | 4
Other assets | 6 | 6
Total assets of the VIEs | 335 | 345
Short-term interest bearing debt | 19 | 226
Long-term interest bearing debt | 196 |
Other liabilities | 10 | 3
Long-term debt due to related parties | 106 | 113
Total liabilities of the VIEs | 331 | 342
Equity of the VIEs | 4 | 3
Book value of units in the Company's consolidated financial statements | 373 | 385
SFL Hercules Limited [Member] |  |
Variable Interest Entity [Line Items] |  |
Investment in finance lease | 316 | 326
Amount due from related parties | 4 | 4
Other assets | 6 | 6
Total assets of the VIEs | 326 | 336
Short-term interest bearing debt | 28 | 27
Long-term interest bearing debt | 210 | 224
Other liabilities | 10 | 2
Long-term debt due to related parties | 73 | 80
Total liabilities of the VIEs | 321 | 333
Equity of the VIEs | 5 | 3
Book value of units in the Company's consolidated financial statements | 525 | 508
SFL Linus Limited [Member] |  |
Variable Interest Entity [Line Items] |  |
Investment in finance lease | 414 | 431
Other assets | 7 | 8
Total assets of the VIEs | 421 | 439
Short-term interest bearing debt | 45 | 48
Long-term interest bearing debt | 240 | 261
Short-term amounts due to related parties | 12 | 4
Long-term debt due to related parties | 115 | 121
Total liabilities of the VIEs | 412 | 434
Equity of the VIEs | 9 | 5
Book value of units in the Company's consolidated financial statements | $ 504 | $ 515

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