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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions | Total | Cumulative Effect, Period Of Adoption, Adjustment | Total equity before NCI | Total equity before NCI Cumulative Effect, Period Of Adoption, Adjustment | Common shares | Additional paid in capital | Contributed surplus | Accumulated other comprehensive income/(loss) | Accumulated other comprehensive income/(loss) Cumulative Effect, Period Of Adoption, Adjustment | Retained Earnings | Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment | Non-controlling interest | Non-controlling interest Cumulative Effect, Period Of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2017 |  |  |  |  | 1,008,000,000 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 6,959 |  | $ 6,560 |  |  | $ 3,313 | $ 1,956 | $ 58 |  | $ 225 |  | $ 399 |
Beginning balance (ASU 2016-01 - Financial Instruments) at Dec. 31, 2017 |  | $ 0 |  |  |  |  |  |  | $ (31) |  | $ 31 |  |
Beginning balance (ASU 2016-16 - Income Taxes) at Dec. 31, 2017 |  | (84) |  | $ (59) |  |  |  |  |  |  | (59) |  | $ (25)
Beginning balance (ASU 2016-09 - Revenue from contracts) at Dec. 31, 2017 |  | 7 |  | 7 |  |  |  |  |  |  | 7 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (3,887) |  | (3,881) |  |  |  |  |  |  | (3,881) |  | (6) |
Other comprehensive (loss)/income | 0 |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation charge | 9 |  | 9 |  |  | 9 |  |  |  |  |  |  |
Reclassification of non-controlling interest | 0 |  | (43) |  |  |  |  |  |  | (43) |  | 43 |
Revaluation of redeemable non-controlling interest | (23) |  | 127 |  |  |  |  |  |  | 127 |  | (150) |
Ending balance, shares at Jul. 01, 2018 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Ending balance at Jul. 01, 2018 | 154 |  | 0 |  |  | 0 | 0 | 0 |  | 0 |  | 154 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance before fresh-start adjustments, shares |  |  |  |  | 1,008,000,000 |  |  |  |  |  |  |  |
Balance before fresh-start adjustments | 2,981 |  | 2,720 |  |  | 3,322 | 1,956 | 27 |  | (3,593) |  | 261 |
Issuance of Successor common stock, shares |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Issuance of Successor common stock | $ 3,501 |  | 3,501 |  |  | 3,491 | 0 | 0 |  | 0 |  | 0 |
Ending balance, shares at Jul. 02, 2018 | 100,000,000 |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Ending balance at Jul. 02, 2018 | $ 3,655 |  | 3,501 |  |  | 3,491 | 0 | 0 |  | 0 |  | 154 |
Beginning balance, shares at Jul. 01, 2018 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Beginning balance at Jul. 01, 2018 | 154 |  | 0 |  |  | 0 | 0 | 0 |  | 0 |  | 154 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (604) |  | (602) |  |  |  |  |  |  | (602) |  | (2) |
Other comprehensive (loss)/income | (7) |  | (7) |  |  |  |  | (7) |  |  |  |  |
Revaluation of redeemable non-controlling interest | $ (9) |  | (9) |  |  |  |  |  |  | (9) |  |  |
Ending balance, shares at Dec. 31, 2018 | 100,000,000 |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 3,035 |  | 2,883 |  |  | 3,491 | 0 | (7) |  | (611) |  | 152 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (1,220) |  | (1,219) |  |  |  |  |  |  | (1,219) |  | (1) |
Other comprehensive (loss)/income | (6) |  | (6) |  |  |  |  | (6) |  |  |  |  |
Share-based compensation charge | 5 |  | 5 |  |  | 5 |  |  |  |  |  |  |
Revaluation of redeemable non-controlling interest | $ (21) |  | (21) |  |  |  |  |  |  | (21) |  |  |
Ending balance, shares at Dec. 31, 2019 | 100,234,973 |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 1,793 | $ (143) | 1,642 | $ (143) |  | 3,496 | 0 | (13) |  | (1,851) | $ (143) | 151 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (4,662) |  | (4,659) |  |  |  |  |  |  | (4,659) |  | (3) |
Other comprehensive (loss)/income | (13) |  | (13) |  |  |  |  | (13) |  |  |  |  |
Share-based compensation charge | 9 |  | 9 |  |  | 9 |  |  |  |  |  |  |
Reclassification of non-controlling interest | (11) |  |  |  |  |  |  |  |  |  |  | (11) |
Revaluation of redeemable non-controlling interest | 25 |  | 25 |  |  |  |  |  |  | 25 |  |  |
Deconsolidation of VIE | (137) |  |  |  |  |  |  |  |  |  |  | (137) |
Cash settlement for cancellation of share scheme | $ (1) |  | (1) |  |  | (1) |  |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2020 | 100,384,435 |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ (3,140) |  | $ (3,140) |  |  | $ 3,504 | $ 0 | $ (26) |  | $ (6,628) |  | $ 0 |

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