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Post-employment benefits for associates (Details 8) - Pension plans - USD ($) shares in Millions, $ in Billions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
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 | 15 years 4 months 25 days | 15 years 2 months 13 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 | 28.00% | 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 | 34.00% | 36.00%
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 | 20.00% |
Defined benefit plan, plan asset allocations | 17.00% | 17.00%
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 | 13.00% | 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 | 8.00% | 5.00%

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