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Post-employment benefits for employees (Details 7) - Pension plans - USD ($) shares in Millions, $ in Billions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan, plan asset allocations | 100.00% | 100.00%
Shares held by defined benefit plan | 2.3 | 2.3
Value of shares held by defined benefit plan | $ 0.2 | $ 0.2
Weighted average duration of defined benefit obligation years | 11 years 9 months 18 days | 14 years 10 months 24 days
Equity securities |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan, target plan asset allocations range minimum | 15.00% |
Defined benefit plan, target plan asset allocations range maximum | 40.00% |
Defined benefit plan, plan asset allocations | 24.00% | 27.00%
Debt securities |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan, target plan asset allocations range minimum | 20.00% |
Defined benefit plan, target plan asset allocations range maximum | 60.00% |
Defined benefit plan, plan asset allocations | 31.00% | 33.00%
Real estate |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan, target plan asset allocations range minimum | 5.00% |
Defined benefit plan, target plan asset allocations range maximum | 30.00% |
Defined benefit plan, plan asset allocations | 21.00% | 19.00%
Alternative investments |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan, target plan asset allocations range minimum | 0.00% |
Defined benefit plan, target plan asset allocations range maximum | 20.00% |
Defined benefit plan, plan asset allocations | 18.00% | 15.00%
Cash and other investments |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan, target plan asset allocations range minimum | 0.00% |
Defined benefit plan, target plan asset allocations range maximum | 15.00% |
Defined benefit plan, plan asset allocations | 6.00% | 6.00%

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