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Debt - Schedule of Debt (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Apr. 30, 2013
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Credit Facility US 2000 North Atlantic Drilling [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | $ 2,000 | $ 2,000 |
Credit Facility US 400 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 400 | 400 |
Credit Facility US 440 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 440 | 440 |
Credit Facility US 1450 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 1,450 | 1,450 |
Credit facility US 360 Asia Off shore Drilling [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 360 | 360 | $ 360
Credit Facility US300 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 300 | 300 |
Credit FacilityUS1750 Sevan Drilling [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 1,750 | 1,750 |
Credit Facility US450 Eminence [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 450 | 450 |
Credit Facility US 1500 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 1,500 | 1,500 |
Credit Facility US 1350 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 1,350 | 1,350 |
Credit Facility US 950 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 950 | 950 |
Credit Facility US 450 [Member] | Secured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 450 | 450 |
Credit Facility Ship Finance International Loans 375 Facility [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 375 | 375 |
Credit Facility Ship Finance International Loans 390 Facility [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 390 | 390 |
Credit Facility Ship Finance International Loans 475 Facility [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 475 | 475 |
Floating Interest Rate Bonds [Member] | Unsecured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 800 | 800 |
Fixed Interest Rate Bonds1 [Member] | Unsecured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 1,000 | 1,000 |
US 500 Million Fixed Interest Bond [Member] | Unsecured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 500 | 500 |
NOK 1500 Million Floating Interest Rate Bond [Member] | Unsecured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 1,500 | 1,500 |
US600 Million Senior Unsecured Bond [Member] | Unsecured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | 600 | 600 |
SEK1 500 Million Senior Unsecured Bond [Member] | Unsecured Debt [Member] |  |  |
Debt and Financial Instruments [Line Items] |  |  |
Debt, face amount | $ 1,500 | $ 1,500 |

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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