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Pension and Other Postretirement Benefits - Narrative (Details) £ in Millions, $ in Millions | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions | £ |  | £ 196 |  |  |  |  |
Expected contributions to be repaid back |  |  |  |  | £ 127 |  | $ 153
Cash contributions repaid | $ 77 |  |  |  | £ 101 | $ 122 |
Multiemployer plans, additional expense | 5 |  | $ 5 | $ 5 |  |  |
Actuarial gain (loss) | 46 |  |  |  |  |  |
Amounts of common stock included in plan assets |  |  | 357 |  |  |  | 265
Total contributions | 13 |  | 12 | $ 13 |  |  |
Pension Plan |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Expected contributions |  |  |  |  |  |  | $ 16
Pension Plan | U.S. Plans |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions | 10 |  | 2 |  |  |  |
Actuarial gain (loss) | 266 |  | 43 |  |  |  |
Pension Plan | Non-U.S. Plans |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions | (63) |  | 234 |  |  |  |
Actuarial gain (loss) | 95 |  | (444) |  |  |  |
Other Postretirement Benefits |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Actuarial gain (loss) | $ 22 |  | $ 20 |  |  |  |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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