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Leases, Future Minimum Payments (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Lessee, Lease, Description [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 76
Total 174
Operating Leases, Future Minimum Payments, Due in Two Years 51
Present value of future minimum lease payments, operating (10)
Operating present value of net minimum lease payments 164
Finance Lease, Liability, to be Paid, Year One 109
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 104
Finance Lease, Liability, to be Paid, Year Five 102
Finance Lease, Liability, to be Paid, after Year Five 450
Finance Lease, Liability, Payment, Due 978
Finance Lease, Liability, Payment Amounts Representing Interest (346)
Finance Lease, Liability 632
Purchased Power Lease 43
Operating Leases, Future Minimum Payments, Due in Three Years 24
Operating Leases, Future Minimum Payments, Due in Four Years 9
Operating Leases, Future Minimum Payments, Due in Five Years 3
Operating Leases, Future Minimum Payments, Due Thereafter 11
New PPAs with battery storage $ 394