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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Commitments As of December 31, 2021, TEP had the following commitments:
(in millions)20222023202420252026ThereafterTotal
Minimum Purchase Commitments
Fuel, Including Transportation$83 $74 $36 $28 $25 $144 $390 
Purchased Power47 47 — — — — 94 
Transmission31 20 15 13 5 4 88 
Purchase Commitments
Renewable Power Purchase Agreements80 80 79 79 79 847 1,244 
RES Performance-Based Incentives7 7 7 5 5 23 54 
Total Commitments$248 $228 $137 $125 $114 $1,018 $1,870