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Fresh Start Accounting - Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Jul. 02, 2018 | Jul. 01, 2018
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Current assets |  |
Cash and cash equivalents |  | $ 809
Restricted cash |  | 409
Marketable securities |  | 121
Accounts receivable, net |  | 272
Amount due from related parties - current |  | 181
Other current assets |  | 247
Total current assets |  | 2,039
Investment in associated companies |  | 1,615
Newbuildings |  | 249
Drilling units |  | 12,531
Deferred tax assets |  | 8
Equipment |  | 35
Amount due from related parties - non-current |  | 565
Assets held for sale - non-current |  | 0
Other non-current assets |  | 3
Total assets |  | 17,045
Current liabilities |  |
Debt due within one year |  | 90
Trade accounts payable |  | 96
Amounts due to related parties - current |  | 4
Other current liabilities |  | 229
Total current liabilities |  | 419
Liabilities subject to compromise |  | 9,050
Long-term debt |  | 856
Long-term debt due to related parties |  | 294
Deferred tax liabilities |  | 105
Other non-current liabilities |  | 57
Total non-current liabilities |  | 1,312
Redeemable non-controlling interest |  | 25
Equity |  |
Predecessor common shares |  | 1,008
Predecessor additional paid-in capital |  | 3,316
Predecessor contributed surplus |  | 1,956
Predecessor accumulated other comprehensive income |  | 41
Predecessor (loss)/retained earnings |  | (146)
Total Shareholders' equity |  | 6,175
Non-controlling interest |  | 64
Total equity |  | 6,239
Total liabilities and equity |  | 17,045
Adjustments, Liabilities and Equity [Abstract] |  |
Adjustments, increase (decrease), Additional paid-in capital |  | (6)
Current assets |  |
Cash and cash equivalents |  | 1,599
Restricted cash |  | 578
Marketable securities |  | 121
Accounts receivable, net |  | 272
Amount due from related parties - current |  | 195
Other current assets |  | 428
Total current assets |  | 3,193
Newbuildings |  | 928
Investment in associated companies |  | 0
Drilling units |  | 6,797
Deferred tax assets |  | 8
Equipment |  | 29
Amount due from related parties - non-current |  | 576
Assets held for sale - non-current |  | 0
Other non-current assets |  | 98
Total assets |  | 11,629
Current liabilities |  |
Debt due within one year |  | 57
Trade accounts payable |  | 113
Amounts due to related parties - current |  | 8
Other current liabilities |  | 361
Total current liabilities |  | 539
Liabilities subject to compromise |  | 0
Long-term debt |  | 7,044
Long-term debt due to related parties |  | 200
Deferred tax liabilities |  | 99
Other non-current liabilities |  | 62
Total non-current liabilities |  | 7,405
Redeemable non-controlling interest |  | 30
Equity |  |
Successor common shares |  | 10
Successor contributed surplus |  | 3,491
Total Shareholders' equity |  | 3,501
Non-controlling interest | $ 154 | 154
Total equity |  | 3,655
Total liabilities and equity |  | 11,629
Reorganization Adjustments |  |
Adjustments, Assets [Abstract] |  |
Adjustments, increase (decrease), Cash and cash equivalents |  | 790
Adjustments, increase (decrease), Restricted cash |  | 169
Adjustments, increase (decrease), Total current assets |  | 959
Adjustments, increase (decrease), Total assets |  | 959
Adjustments, Liabilities and Equity [Abstract] |  |
Adjustments, increase (decrease), Trade accounts payable |  | 17
Adjustments, increase (decrease), Amounts due to related parties - current |  | 4
Change in other liabilities |  | 100
Adjustments, increase (decrease), Total current liabilities |  | 121
Adjustments, increase (decrease), Liabilities subject to compromise |  | (9,050)
Net increase in long-term debt |  | 6,292
Adjustments, increase (decrease), Other non-current liabilities |  | 3
Adjustments, increase (decrease), Total non-current liabilities |  | 6,295
Adjustments, increase (decrease), Common shares | 10 | (1,008)
Adjustments, increase (decrease), Additional paid-in capital |  | (3,322)
Adjustments, increase (decrease), Additional paid-in capital |  | (6)
Adjustments, increase (decrease), Contributed surplus | 2,860 | (1,956)
Total change in predecessor retained (loss)/earnings |  | 7,110
Adjustments, increase (decrease), Total Shareholders' equity |  | 3,700
Adjustments, increase (decrease), Non-controlling interest |  | (107)
Adjustments, increase (decrease), Total equity |  | 3,593
Adjustments, increase (decrease), Total liabilities and equity |  | 959
Fresh Start Adjustments |  |
Adjustments, Assets [Abstract] |  |
Adjustments, increase (decrease), Amount due from related parties - current |  | 14
Adjustments, increase (decrease), Other current assets |  | 181
Adjustments, increase (decrease), Total current assets |  | 195
Adjustments, increase (decrease), Investment in associated companies |  | (687)
Adjustments, increase (decrease), Newbuildings |  | (249)
Adjustments, increase (decrease), Drilling units |  | (5,734)
Adjustments, increase (decrease), Equipment |  | (6)
Adjustments, increase (decrease), Amount due from related parties - non-current |  | 11
Adjustments, increase (decrease), Other non-current assets |  | 95
Adjustments, increase (decrease), Total assets |  | (6,375)
Adjustments, Liabilities and Equity [Abstract] |  |
Adjustments, increase (decrease), Debt due within one year |  | (33)
Change in other liabilities |  | 32
Adjustments, increase (decrease), Total current liabilities |  | (1)
Adjustments, increase (decrease), Liabilities subject to compromise |  | 0
Net increase in long-term debt |  | (104)
Adjustments, increase (decrease), Long-term debt due to related parties |  | (94)
Adjustments, increase (decrease), Deferred tax liabilities |  | (6)
Adjustments, increase (decrease), Other non-current liabilities |  | 2
Adjustments, increase (decrease), Total non-current liabilities |  | (202)
Adjustments, increase (decrease), Redeemable non-controlling interest |  | 5
Adjustments, increase (decrease), Contributed surplus | $ 631 |
Adjustments, increase (decrease), Accumulated other comprehensive income |  | (41)
Total change in predecessor retained (loss)/earnings |  | (6,964)
Adjustments, increase (decrease), Total Shareholders' equity |  | (6,374)
Adjustments, increase (decrease), Non-controlling interest |  | 197
Adjustments, increase (decrease), Total equity |  | (6,177)
Adjustments, increase (decrease), Total liabilities and equity |  | $ (6,375)

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