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PENSION AND OTHER POSTRETIREMENT BENEFITS - Changes in Level 3 Fair Value (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Direct private investments | U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | $ 1,336 | $ 1,220
Relating to assets still held at year-end | (66) | 11
Relating to assets sold during the year | 98 | 174
Purchases | 75 | 194
Sales and settlements | (159) | (263)
Fair value of plan assets at end of year | 1,284 | 1,336
Real estate properties | U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 843 | 651
Relating to assets still held at year-end | 88 | 96
Relating to assets sold during the year | (24) | 0
Purchases | 148 | 99
Sales and settlements | (50) | (3)
Fair value of plan assets at end of year | 1,005 | 843
Private funds | Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 33 | 29
Relating to assets still held at year-end | 11 | 4
Relating to assets sold during the year | 0 | 0
Purchases | 0 | 0
Sales and settlements | (8) | 0
Fair value of plan assets at end of year | 36 | 33
Real estate funds | Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 163 | 147
Relating to assets still held at year-end | (33) | 23
Relating to assets sold during the year | 1 | 4
Purchases | 0 | 0
Sales and settlements | (1) | (11)
Fair value of plan assets at end of year | 130 | 163
Insurance buy-in contracts | Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at beginning of year | 691 | 767
Relating to assets still held at year-end | (477) | (76)
Relating to assets sold during the year | 0 | 0
Purchases | 736 | 0
Sales and settlements | 0 | 0
Fair value of plan assets at end of year | $ 950 | $ 691

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