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Other liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Payables and Accruals [Abstract] |
Other liabilities | As at December 31, 2020 and December 31, 2019, other liabilities included the following:
(In $ millions) | December 31, 2020 |  | December 31, 2019
Taxes payable | 29 |  |  | 33 |
Contract liabilities | 31 |  |  | 29 |
Unfavorable drilling contracts | 7 |  |  | 8 |
Employee withheld taxes, social security and vacation payments | 47 |  |  | 51 |
Accrued interest expense | 38 |  |  | 40 |
Accrued expenses | 110 |  |  | 137 |
Lease liabilities | 68 |  |  | 36 |
Uncertain tax positions | 79 |  |  | 83 |
Other liabilities | 27 |  |  | 33 |
Total Other Liabilities | 436 |  |  | 450 |
Other liabilities are presented in our Consolidated Balance Sheet as follows:
(In $ millions) | December 31, 2020 |  | December 31, 2019
Other current liabilities | 316 |  |  | 322 |
Other non-current liabilities | 120 |  |  | 128 |
Total Other Liabilities | 436 |  |  | 450 |
Schedule of gross carrying amounts and accumulated amortization of intangible liabilities | The gross carrying amounts and accumulated amortization included in 'Other current liabilities' and 'Other non-current liabilities' for unfavorable contracts in the Consolidated Balance Sheets as follows:
|  | December 31, 2020 |  | December 31, 2019
(In $ millions) |  | Gross Carrying Amount | Accumulated amortization | Net carrying amount |  | Gross Carrying Amount | Accumulated amortization | Net carrying amount
Unfavorable contracts |  |  |  |  |  |  |  |
Balance at beginning of period |  | (66) |  | 58 |  | (8) |  |  | (66) |  | 39 |  | (27) |
Amortization of unfavorable contracts |  | — |  | 1 |  | 1 |  |  | — |  | 19 |  | 19 |
Balance at end of period |  | (66) |  | 59 |  | (7) |  |  | (66) |  | 58 |  | (8) |
Schedule of expected amortization of unfavorable contracts | The table below shows the amounts relating to unfavorable contracts that is expected to be amortized over the following periods:
(In $ millions) | Period ended December 31,
| 2021 | 2022 | 2023 | 2024 | 2025 and thereafter | Total
Amortization of unfavorable contracts | 1 | 1 | 1 | 1 | 3 | 7

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- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
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