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Pension and Other Postretirement Benefits - Narrative (Details) £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2022 GBP (£) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 GBP (£)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 92 | £ 71 |  |
Settlement charge | $ 1,511 |  |  |  |
Forecast |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  |  | $ 154 | £ 127

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