COMMITMENTS, GUARANTEES AND CONTINGENCIES - Nuclear Insurance, Commitments and Collateral (Details)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Outstanding guarantees and other assurances aggregated	$ 1,100,000,000
Company posted collateral related to net liability positions	55,000,000
Subsidiaries' Guarantees
Loss Contingencies [Line Items]
Outstanding guarantees and other assurances aggregated	600,000,000
Other Assurances
Loss Contingencies [Line Items]
Outstanding guarantees and other assurances aggregated	500,000,000
Term Loan Facility Due November 2024 | Line of Credit | Global Holding
Loss Contingencies [Line Items]
Face amount of loan	$ 120,000,000