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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Nuclear Insurance, Commitments and Collateral (Details) | 3 Months Ended
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Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | $ 1,700,000,000
Company posted collateral related to net liability positions | 20,000,000
Collateral posted due to credit rating downgrade | 19,000,000
Subsidiaries' Guarantees |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 1,100,000,000
Other Guarantees |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 108,000,000
Other Assurances |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 490,000,000
Global Holding | Senior Secured Term Loan | Senior Loans |
Loss Contingencies [Line Items] |
Long-term debt and other long-term obligations | $ 108,000,000
Global Holding | Signal Peak, Global Rail and Affiliates | Senior Secured Term Loan | Senior Loans |
Loss Contingencies [Line Items] |
Investment ownership percentage | 69.99%
FEV | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |
Loss Contingencies [Line Items] |
Investment ownership percentage | 33.33%
WMB Marketing Ventures, LLC | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |
Loss Contingencies [Line Items] |
Investment ownership percentage | 33.33%
Term Loan Facility Due March 2020 | Line of Credit | Global Holding |
Loss Contingencies [Line Items] |
Face amount of loan | $ 120,000,000

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