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EMPLOYEE BENEFITS - Schedule of Long-term Rates of Return on Pension and PBOP (Details) | Dec. 31, 2021 | Dec. 31, 2020
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United States |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 15.00% | 15.00%
Assumed Rate of Return | 8.50% | 8.50%
Global |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 10.00% | 10.00%
Assumed Rate of Return | 8.75% | 8.75%
Non-United States |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 8.00% | 8.00%
Assumed Rate of Return | 8.50% | 8.50%
Emerging Markets |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 4.00% | 4.00%
Assumed Rate of Return | 10.00% | 10.00%
Fixed Income |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 13.00% | 13.00%
Assumed Rate of Return | 4.00% | 4.00%
Public High Yield Fixed Income |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 4.00% | 4.00%
Assumed Rate of Return | 6.50% | 6.50%
Private Debt |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 13.00% | 15.00%
Assumed Rate of Return | 9.00% | 9.00%
Private Equity |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 18.00% | 15.00%
Assumed Rate of Return | 12.00% | 12.00%
Real Assets |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Target Asset Allocation | 15.00% | 16.00%
Assumed Rate of Return | 7.50% | 7.50%

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