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Interest expense (Tables) | 12 Months Ended
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Dec. 31, 2020
Interest Expense [Abstract] |
Net interest expense | Interest expense consists of the following:
| 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
Cash and payment-in-kind interest on debt facilities (a) | (338) |  |  | (440) |  |  | (237) |  |  |  | (37) |
Unwind of discount debt (b) | (44) |  |  | (47) |  |  | (24) |  |  |  | — |
Write off of discount on debt (c) | (87) |  |  | — |  |  | — |  |  |  | — |
Other | — |  |  | — |  |  | — |  |  |  | (1) |
Interest expense | (469) |  |  | (487) |  |  | (261) |  |  |  | (38) |
(a) Cash and payment-in-kind interest on debt facilities We incur cash and payment-in-kind interest on our debt facilities. This is summarized in the table below.
| 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
Senior credit facilities and unsecured bonds | (239) |  |  | (327) |  |  | (162) |  |  |  | (116) |
Less: adequate protection payments | — |  |  | — |  |  | — |  |  |  | 104 |
Senior Secured Notes | (60) |  |  | (66) |  |  | (50) |  |  |  | — |
Debt of consolidated variable interest entities | (39) |  |  | (47) |  |  | (25) |  |  |  | (25) |
Cash and payment-in-kind interest | (338) |  |  | (440) |  |  | (237) |  |  |  | (37) |

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- References No definition available. + Details
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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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