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RETIREMENT BENEFITS PLANS - Changes in Pension and Other Postretirement Liabilities Recognized in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Pension plans | United States |  |
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss |  |
Balance at January 1 | $ 1,051 | $ 1,103
Prior service cost arising during the year | 1 | 0
Net loss (gain) arising during the year | (238) | 112
Currency translation | 0 | 0
Other | 0 | 0
Less amounts included in expense during the year | (101) | (164)
Net change for the year | (338) | (52)
Balance at December 31 | 713 | 1,051
Pension plans | Foreign Plan |  |
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss |  |
Balance at January 1 | 1,026 | 904
Prior service cost arising during the year | 0 | 1
Net loss (gain) arising during the year | (151) | 141
Currency translation | (24) | 48
Other | 0 | 2
Less amounts included in expense during the year | (88) | (70)
Net change for the year | (263) | 122
Balance at December 31 | 763 | 1,026
Other postretirement benefits plans |  |
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss |  |
Balance at January 1 | (2) | (25)
Prior service cost arising during the year | 0 | 0
Net loss (gain) arising during the year | (59) | 10
Currency translation | 0 | 0
Other | 0 | 0
Less amounts included in expense during the year | 6 | 13
Net change for the year | (53) | 23
Balance at December 31 | $ (55) | $ (2)

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