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RETIREMENT BENEFITS PLANS - Change in Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Change in plan assets |  |  |
Balance at January 1 | $ 5,919 |  |
Balance at December 31 | 4,121 | $ 5,919 |
Pension plans |  |  |
Change in plan assets |  |  |
Employer contributions | 116 | 343 | $ 122
Pension plans | United States |  |  |
Change in plan assets |  |  |
Balance at January 1 | 3,672 | 3,463 |
Actual return on plan assets | (682) | 380 |
Employer contributions | 30 | 237 | 18
Gross benefits paid | (386) | (435) |
Currency translation | 0 | 0 |
Acquisitions and divestitures | 0 | 27 |
Other | 0 | 0 |
Balance at December 31 | 2,635 | 3,672 | 3,463
Pension plans | Foreign Plan |  |  |
Change in plan assets |  |  |
Balance at January 1 | 2,247 | 2,137 |
Actual return on plan assets | (554) | 127 |
Employer contributions | 85 | 106 | 104
Gross benefits paid | (99) | (107) |
Currency translation | (197) | (23) |
Acquisitions and divestitures | 0 | 4 |
Other | 3 | 3 |
Balance at December 31 | 1,486 | 2,247 | 2,137
Other postretirement benefits plans |  |  |
Change in plan assets |  |  |
Balance at January 1 | 19 | 20 |
Actual return on plan assets | (2) | 0 |
Employer contributions | 24 | 20 |
Gross benefits paid | (38) | (36) |
Currency translation | 0 | 0 |
Acquisitions and divestitures | 0 | 0 |
Other | 13 | 15 |
Balance at December 31 | $ 16 | $ 19 | $ 20

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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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