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Commitment and Contingencies (Tables)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]    
Schedule of Components of Lease Expense
Components of lease expense:
Three Months Ended June 30
(Millions of Dollars)20212020
Operating leases
PPA capacity payments$26 $25 
Other operating leases (a)
Total operating lease expense (b)
$29 $28 
Finance leases
Amortization of ROU assets$$
Interest expense on lease liability
Total finance lease expense$$
(a)Includes immaterial short-term lease expense for 2021 and 2020.
(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Six Months Ended June 30
(Millions of Dollars)20212020
Operating leases
PPA capacity payments$51 $49 
Other operating leases (a)
77
Total operating lease expense (b)
$58 $56 
Finance leases
Amortization of ROU assets$$
Interest expense on lease liability89
Total finance lease expense$12 $12 
(a)Includes short-term lease expense of $1 million for 2021 and 2020, respectively.
(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Schedule of Future Commitments under Operating Leases  
Commitments under operating and finance leases as of June 30, 2021:
(Millions of Dollars)PPA Operating LeasesOther Operating LeaseTotal Operating LeasesFinance Leases
Total minimum obligation$493 $61 $554 $472 
Interest component of obligation(65)(7)(72)(344)
Present value of minimum obligation$428 $54 482 128 
Less current portion(98)(5)
Noncurrent operating and finance lease liabilities$384 $123