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Other Assets
 12 Months Ended
Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets OTHER ASSETS
($ millions)2023 2022 
Employee future benefits (Note 24)355 274 
Equity investments (1)
237 201 
RECs (Note 8)
155 142 
Other investments133 115 
Supplemental Executive Retirement Plan ("SERP")117 155 
Operating leases (Note 15)51 43 
Derivatives43 118 
Deferred compensation plan22 40 
Other185 125 
1,298 1,213 
(1)    Includes investments in Belize Electricity and Wataynikaneyap Partnership

ITC, UNS Energy and Central Hudson provide additional post-employment benefits through SERPs and deferred compensation plans for directors and officers. The assets held to support these plans are reported separately from the related liabilities (Note 16). Most plan assets are held in trust and funded mainly through life insurance policies and mutual funds. Assets in mutual and money market funds are recorded at fair value on a recurring basis (Note 26).