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Share based compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based compensation expense | The share-based compensation expense for our share options and Restricted Stock Unit ("RSU") plans in the Consolidated Statements of Operations are as follows:
| Successor |  |  | Predecessor
(In $ millions) | Year ended December 31, 2020 |  | Year ended December 31, 2019 |  | Period from July 2, 2018 through December 31, 2018 |  |  | Period from January 1, 2018 through July 1, 2018
Share-based compensation expense (1) | 8 |  |  | 5 |  |  | — |  |  |  | 9 |
Total share-based compensation expense | 8 |  |  | 5 |  |  | — |  |  |  | 9 |
(1)The $9 million expense for the period from January 1, 2018 through July 1, 2018 included a charge of $6 million for schemes cancelled on emergence from the Previous Chapter 11 Proceedings. This was classified within reorganization items.

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