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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Restrictions on cash and cash equivalents The following table presents the line items and amounts of cash, cash equivalents, and restricted cash reported on the balance sheet and reconciles their sum to the cash flow statement:
Years Ended December 31,
(in millions)202120202019
Cash and Cash Equivalents$10 $61 $10 
Restricted Cash included in:
Investments and Other Property20 19 16 
Current Assets—Other3 2 2 
Total Cash, Cash Equivalents, and Restricted Cash$33 $82 $28 
AFUDC rates The average AFUDC rates on regulated construction expenditures are included in the table below:
202120202019
Average AFUDC Rates6.88 %6.63 %7.86 %
Summary of average annual depreciation rates for all utility plants Below are the summarized average annual depreciation rates for all utility plant:
202120202019
Average Annual Depreciation Rates3.30 %3.15 %3.08 %
Schedule of renewable energy credit The table below summarizes the balance of TEP's RECs that are included in Regulatory and Other Assets—Other on the Consolidated Balance Sheets:
December 31,
(in millions)20212020
Beginning of Period$66 $63 
Purchased49 48 
Used for Compliance(46)(45)
End of Period$69 $66