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Regulatory Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
7. Regulatory Assets and Liabilities
Regulatory Assets	As at December 31 December 31 millions of dollars  2022 2021 Regulatory assets Deferred income tax regulatory assets $ 1,166 $ 1,045 Cost recovery clauses 707 114 Tampa Electric capital cost recovery for early retired assets  674 657 Pension and post-retirement medical plan 369 291 FAM 307 145 Storm reserve  103 - NMGC winter event gas cost recovery 69 117 Storm restoration 35 35 Deferrals related to derivative instruments 30 23 Environmental remediations 27 27 Stranded cost recovery 27 26 Other 106 86 $ 3,620 $ 2,566 Current $ 602 $ 253 Long-term 3,018 2,313 Total regulatory assets  $ 3,620 $ 2,566 Regulatory liabilities Accumulated reserve - cost of remova l 895 819 Deferred income tax regulatory liabilities 877 863 Deferrals related to derivative instruments 230 241 NMGC gas hedge settlements (note 18) 162 - Cost recovery clauses  70 35 Self-insurance fund (note 32) 30 28 Storm reserve - 58 Other 9 11 $ 2,273 $ 2,055 Current $ 495 $ 290 Long-term 1,778 1,765 Total regulatory liabilities $ 2,273 $ 2,055
Regulatory Liabilities	As at December 31 December 31 millions of dollars  2022 2021 Regulatory assets Deferred income tax regulatory assets $ 1,166 $ 1,045 Cost recovery clauses 707 114 Tampa Electric capital cost recovery for early retired assets  674 657 Pension and post-retirement medical plan 369 291 FAM 307 145 Storm reserve  103 - NMGC winter event gas cost recovery 69 117 Storm restoration 35 35 Deferrals related to derivative instruments 30 23 Environmental remediations 27 27 Stranded cost recovery 27 26 Other 106 86 $ 3,620 $ 2,566 Current $ 602 $ 253 Long-term 3,018 2,313 Total regulatory assets  $ 3,620 $ 2,566 Regulatory liabilities Accumulated reserve - cost of remova l 895 819 Deferred income tax regulatory liabilities 877 863 Deferrals related to derivative instruments 230 241 NMGC gas hedge settlements (note 18) 162 - Cost recovery clauses  70 35 Self-insurance fund (note 32) 30 28 Storm reserve - 58 Other 9 11 $ 2,273 $ 2,055 Current $ 495 $ 290 Long-term 1,778 1,765 Total regulatory liabilities $ 2,273 $ 2,055

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Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet.

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Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability.

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