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Debt - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 USD ($) | May 31, 2013 USD ($) Facility | Apr. 30, 2013 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Oct. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Apr. 26, 2017 USD ($)
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Protection payment |  |  |  | $ 185 |  |  |  |
Total debt principal |  |  |  | $ 8,547 |  |  | $ 8,701 |
Debt service coverage ratio |  |  |  | 1 |  |  |  |
Credit Facility Ship Finance International Loans 375 Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  |  |  | $ 237 |  |  | 251 |
Debt, face amount |  |  |  | 375 |  |  | 375 |
Credit Facility Ship Finance International Loans 390 Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  |  |  | 215 |  |  | 226 |
Debt, face amount |  |  |  | 390 |  |  | 390 |
Credit Facility Ship Finance International Loans 475 Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  |  |  | 285 |  |  | 309 |
Debt, face amount |  |  |  | 475 |  |  | 475 |
Credit Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Debt covenant, cash and cash equivalents |  |  |  | 400 |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  |  |  | 5,476 |  |  | 5,581 |
Number of facilities | Facility |  | 3 |  |  |  |  |  |
Secured Debt [Member] | Credit facility US 360 Asia Off shore Drilling [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  |  |  | 210 |  |  | 210 |
Debt, face amount |  |  | $ 360 | 360 |  |  | $ 360 |
Debt instrument term |  |  | 5 years |  |  |  |  |
Secured Debt [Member] | SFL Hercules Limited [Member] | Credit Facility Ship Finance International Loans 375 Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  | $ 375 |  |  |  |  |  |
Secured Debt [Member] | SFL Deepwater Limited [Member] | Credit Facility Ship Finance International Loans 390 Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 390 |  |
Secured Debt [Member] | SFL Linus Limited [Member] | Credit Facility Ship Finance International Loans 475 Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 475 |  |
Secured Debt [Member] | Ship Finance International Limited [Member] | Long-term Debt [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Reclassification of long-term debt |  |  |  | 200 |  |  |  |
Archer [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Subordinated loan |  |  |  |  | $ 37 |  |  | $ 37
Loans payable |  |  |  |  | 45 |  |  | 45
Loans payable fair value |  |  |  |  | 56 |  |  | $ 56
Net gain on debt extinguishment |  |  |  | 19 | $ 19 |  |  |
Minimum [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Debt covenant, cash and cash equivalents |  |  |  | $ 525 |  |  |  |
Maximum [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Permitted leverage ratio for period one |  |  |  | 4.5 |  |  |  |
Permitted leverage ratio for period two |  |  |  | 4.2 |  |  |  |
Permitted leverage ratio for period three |  |  |  | 3.9 |  |  |  |
Permitted leverage ratio for period four |  |  |  | 3.7 |  |  |  |
LIBOR [Member] | Secured Debt [Member] | Credit facility US 360 Asia Off shore Drilling [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.75% |  |  |  |  |
Subsequent Event [Member] | Senior Secured Notes Due in 2025 [Member] |  |  |  |  |  |  |  |
Debt and Financial Instruments [Line Items] |  |  |  |  |  |  |  |
Total debt principal | $ 880 |  |  |  |  |  |  |
Interest rate | 12.00% |  |  |  |  |  |  |
Cash interest | 4.00% |  |  |  |  |  |  |
Interest payable in kind | 8.00% |  |  |  |  |  |  |
Debt, face amount | $ 880 |  |  |  |  |  |  |

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