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Leases, Future Minimum Payments (Details)
$ in Millions
Sep. 30, 2022
USD ($)
Lessee, Lease, Description [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 61
Operating Leases, Future Minimum Payments, Due in Two Years 43
Operating Leases, Future Minimum Payments, Due in Three Years 35
Operating Leases, Future Minimum Payments, Due in Four Years 10
Operating Leases, Future Minimum Payments, Due in Five Years 2
Operating Leases, Future Minimum Payments, Due Thereafter 5
Total 156
Present value of future minimum lease payments, operating (4)
Operating present value of net minimum lease payments 152
Finance Lease, Liability, to be Paid, Year One 112
Finance Lease, Liability, to be Paid, Year Two 107
Finance Lease, Liability, to be Paid, Year Three 106
Finance Lease, Liability, to be Paid, Year Four 105
Finance Lease, Liability, to be Paid, Year Five 104
Finance Lease, Liability, Payments Due Thereafter 552
Finance Lease, Liability, Payment, Due 1,086
Finance Lease, Liability, Payment Amounts Representing Interest (399)
Finance Lease, Liability 687
Purchased Power Lease 414
Purchased Power Lease - Gulch Union $ 15