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Retirement benefits - Asset Allocation Target and Actual Percentage (Details) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
U.S. equity securities | Minimum |  |
Asset category, Target |  |
Target | 60.00% |
U.S. equity securities | Maximum |  |
Asset category, Target |  |
Target | 80.00% |
Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 100.00% | 100.00%
Asset category, Target |  |
Target | 100.00% |
Pension benefits | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 59.00% | 58.00%
Asset category, Target |  |
Target | 52.00% |
Pension benefits | U.S. equity securities | Minimum |  |
Asset category, Target |  |
Target | 45.00% |
Pension benefits | U.S. equity securities | Maximum |  |
Asset category, Target |  |
Target | 65.00% |
Pension benefits | Non-U.S equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 13.00% | 14.00%
Asset category, Target |  |
Target | 15.00% |
Pension benefits | Non-U.S equity securities | Minimum |  |
Asset category, Target |  |
Target | 5.00% |
Pension benefits | Non-U.S equity securities | Maximum |  |
Asset category, Target |  |
Target | 25.00% |
Pension benefits | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 27.00% | 28.00%
Asset category, Target |  |
Target | 30.00% |
Pension benefits | Fixed income securities | Minimum |  |
Asset category, Target |  |
Target | 20.00% |
Pension benefits | Fixed income securities | Maximum |  |
Asset category, Target |  |
Target | 40.00% |
Pension benefits | Private equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 1.00% | 0.00%
Asset category, Target |  |
Target | 3.00% |
Pension benefits | Private equity | Minimum |  |
Asset category, Target |  |
Target | 0.00% |
Pension benefits | Private equity | Maximum |  |
Asset category, Target |  |
Target | 5.00% |
Other benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 100.00% | 100.00%
Asset category, Target |  |
Target | 100.00% |
Other benefits | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 58.00% | 57.00%
Asset category, Target |  |
Target | 52.00% |
Other benefits | U.S. equity securities | Minimum |  |
Asset category, Target |  |
Target | 45.00% |
Other benefits | U.S. equity securities | Maximum |  |
Asset category, Target |  |
Target | 65.00% |
Other benefits | Non-U.S equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 15.00% | 16.00%
Asset category, Target |  |
Target | 15.00% |
Other benefits | Non-U.S equity securities | Minimum |  |
Asset category, Target |  |
Target | 5.00% |
Other benefits | Non-U.S equity securities | Maximum |  |
Asset category, Target |  |
Target | 25.00% |
Other benefits | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 27.00% | 27.00%
Asset category, Target |  |
Target | 30.00% |
Other benefits | Fixed income securities | Minimum |  |
Asset category, Target |  |
Target | 20.00% |
Other benefits | Fixed income securities | Maximum |  |
Asset category, Target |  |
Target | 40.00% |
Other benefits | Private equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocation | 0.00% | 0.00%
Asset category, Target |  |
Target | 3.00% |
Other benefits | Private equity | Minimum |  |
Asset category, Target |  |
Target | 0.00% |
Other benefits | Private equity | Maximum |  |
Asset category, Target |  |
Target | 5.00% |

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