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RETIREMENT BENEFITS PLANS - Fair Value of Other Postretirement Benefits Plan Assets (Details) - Other postretirement benefits plans - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value of Other Postretirement Benefits Plan Assets [Line Items] |  |
Cash equivalents | $ 3 | $ 3
Common Collective Trusts, Fixed Income | 16 | 17
Total other postretirement benefits plan assets | 19 | 20
Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value of Other Postretirement Benefits Plan Assets [Line Items] |  |
Cash equivalents | 3 | 3
Total other postretirement benefits plan assets | 3 | 3
Other observable inputs (Level 2) |  |
Fair Value of Other Postretirement Benefits Plan Assets [Line Items] |  |
Cash equivalents | 0 | 0
Total other postretirement benefits plan assets | 0 | 0
Unobservable inputs (Level 3) |  |
Fair Value of Other Postretirement Benefits Plan Assets [Line Items] |  |
Cash equivalents | 0 | 0
Total other postretirement benefits plan assets | $ 0 | $ 0

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