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Leases, Future Minimum Payments (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Lessee, Lease, Description [Line Items]  
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 42
Operating Leases, Future Minimum Payments, Due in Two Years 40
Operating Leases, Future Minimum Payments, Due in Three Years 37
Operating Leases, Future Minimum Payments, Due in Four Years 34
Operating Leases, Future Minimum Payments, Due in Five Years 10
Operating Leases, Future Minimum Payments, Due Thereafter 5
Total 168
Present value of future minimum lease payments, operating (6)
Operating present value of net minimum lease payments 162
Finance Lease, Liability, to be Paid, Year One 115
Finance Lease, Liability, to be Paid, Year Two 112
Finance Lease, Liability, to be Paid, Year Three 107
Finance Lease, Liability, to be Paid, Year Four 106
Finance Lease, Liability, to be Paid, Year Five 105
Finance Lease, Liability, Payments Due Thereafter 656
Finance Lease, Liability, Payment, Due 1,201
Finance Lease, Liability, Payment Amounts Representing Interest (454)
Finance Lease, Liability 747
Purchased Power Lease $ 413