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Pension and Other Postretirement Benefits - Schedule of Projected and Changes in Benefit Obligations (Details) £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 USD ($)
Projected Benefit Obligations |  |  |  |
Actuarial (gain) / loss | $ (46) |  |  |
Plan Assets |  |  |  |
Employer contributions | £ |  |  | £ 196 |
Other Postretirement Benefits |  |  |  |
Projected Benefit Obligations |  |  |  |
Benefit obligations at beginning of period | 137 | $ 163 |  |
Service cost | 1 | 1 |  | $ 1
Interest cost | 4 | 4 |  | 5
Actuarial (gain) / loss | (22) | (20) |  |
Benefits paid | (11) | (10) |  |
Foreign currency translation | (1) | (1) |  |
Benefit obligations at end of period | 108 | 137 |  | 163
U.S. Plans | Pension Plan |  |  |  |
Projected Benefit Obligations |  |  |  |
Benefit obligations at beginning of period | 1,413 | 1,505 |  |
Service cost | 19 | 20 |  | 18
Interest cost | 31 | 25 |  | 38
Plan participants’ contributions | 0 | 0 |  |
Amendments | 1 | 2 |  |
Settlements | (9) | 0 |  |
Curtailments | (2) | (10) |  |
Special termination benefits | 0 | 6 |  |
Actuarial (gain) / loss | (266) | (43) |  |
Benefits paid | (93) | (92) |  |
Foreign currency translation | 0 | 0 |  |
Benefit obligations at end of period | 1,094 | 1,413 |  | 1,505
Plan Assets |  |  |  |
Balance at beginning of period | 1,177 | 1,152 |  |
Actual return on plan assets | (199) | 115 |  |
Employer contributions | 10 | 2 |  |
Plan participants’ contributions | 0 | 0 |  |
Settlements | (9) | 0 |  |
Benefits paid | (93) | (92) |  |
Foreign currency translation | 0 | 0 |  |
Balance at end of period | 886 | 1,177 |  | 1,152
Funded status | (208) | (236) |  |
Accumulated benefit obligations at end of period | 1,055 | 1,361 |  |
Non-U.S. Plans | Pension Plan |  |  |  |
Projected Benefit Obligations |  |  |  |
Benefit obligations at beginning of period | 513 | 3,172 |  |
Service cost | 9 | 13 |  | 10
Interest cost | 13 | 32 |  | 52
Plan participants’ contributions | 2 | 2 |  |
Amendments | 0 | (3) |  |
Settlements | (9) | (2,982) |  |
Curtailments | 0 | (7) |  |
Special termination benefits | 0 | 0 |  |
Actuarial (gain) / loss | (95) | 444 |  |
Benefits paid | (30) | (165) |  |
Foreign currency translation | (16) | 7 |  |
Benefit obligations at end of period | 387 | 513 |  | 3,172
Plan Assets |  |  |  |
Balance at beginning of period | 529 | 3,518 |  |
Actual return on plan assets | (22) | (94) |  |
Employer contributions | (63) | 234 |  |
Plan participants’ contributions | 2 | 2 |  |
Settlements | (7) | (2,982) |  |
Benefits paid | (31) | (165) |  |
Foreign currency translation | (27) | 16 |  |
Balance at end of period | 381 | 529 |  | $ 3,518
Funded status | (6) | 16 |  |
Accumulated benefit obligations at end of period | $ 361 | $ 474 |  |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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