Employee benefit obligations - Plan Asset Composition (Details) |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Disclosure of defined benefit plans [abstract] | ||
| Cash and equivalent | 0.60% | 0.90% |
| Debt instruments | 28.40% | 28.00% |
| Equity instruments | 31.50% | 30.80% |
| Real estate | 23.00% | 22.80% |
| Alternative assets | 16.50% | 17.50% |
| Total | 100.00% | 100.00% |
| X | ||||||||||
- Definition The percentage cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Cash and cash equivalents, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Debt instruments, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Equity instruments, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The percentage other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Other assets, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The percentage real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Real estate, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Plan Assets At Fair Value Allocation Percentage No definition available.
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