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Debt - Schedule of Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt and Financial Instruments [Line Items] |  |
Total debt principal | $ 8,547 | $ 8,701
Less: Debt balance held as subject to compromise | (7,600) | (7,705)
Total debt not subject to compromise | 947 | 996
Total debt not subject to compromise | 947 | 996
Less: current portion of debt principal | (91) | (511)
Long-term portion of debt principal | 856 | 485
Credit Facility Ship Finance International Loans 375 Facility [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 237 | 251
Credit Facility Ship Finance International Loans 390 Facility [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 215 | 226
Credit Facility Ship Finance International Loans 475 Facility [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 285 | 309
Credit Facility Ship Finance International Loans Total [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 737 | 786
Secured Debt [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 5,476 | 5,581
Secured Debt [Member] | Credit Facility US 2000 North Atlantic Drilling [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 880 | 897
Secured Debt [Member] | Credit Facility US 400 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 130 | 133
Secured Debt [Member] | Credit Facility US 440 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 60 | 62
Secured Debt [Member] | Credit Facility US 1450 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 311 | 318
Secured Debt [Member] | Credit facility US 360 Asia Off shore Drilling [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 210 | 210
Secured Debt [Member] | Credit Facility US300 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 140 | 142
Secured Debt [Member] | Credit FacilityUS1750 Sevan Drilling [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 835 | 856
Secured Debt [Member] | Credit Facility US450 Eminence [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 255 | 261
Secured Debt [Member] | Credit Facility US 1500 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 1,095 | 1,112
Secured Debt [Member] | Credit Facility US 1350 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 913 | 931
Secured Debt [Member] | Credit Facility US 950 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 549 | 558
Secured Debt [Member] | Credit Facility US 450 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 98 | 101
Unsecured Debt [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Less: Debt balance held as subject to compromise | (5,300) | (5,400)
Unsecured Debt [Member] | Floating Interest Rate Bonds [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 231 | 231
Unsecured Debt [Member] | Fixed Interest Rate Bonds1 [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 843 | 843
Unsecured Debt [Member] | US 500 Million Fixed Interest Bond [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 479 | 479
Unsecured Debt [Member] | NOK 1500 Million Floating Interest Rate Bond [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 182 | 182
Unsecured Debt [Member] | US600 Million Senior Unsecured Bond [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 413 | 413
Unsecured Debt [Member] | SEK1 500 Million Senior Unsecured Bond [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | 186 | 186
Unsecured Debt [Member] | Total Bonds [Member] |  |
Debt and Financial Instruments [Line Items] |  |
Total debt principal | $ 2,334 | $ 2,334

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