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Leases Maturities of Lease Liabilities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Leases [Abstract]  
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months $ 2
Finance Lease, Liability, Payments, Remainder of Fiscal Year 4
Lessee, Operating Lease, Liability, Payments, Due Year Two 8
Finance Lease, Liability, Payments, Due Year Two 16
Lessee, Operating Lease, Liability, Payments, Due Year Three 8
Finance Lease, Liability, Payments, Due Year Three 16
Lessee, Operating Lease, Liability, Payments, Due Year Four 8
Finance Lease, Liability, Payments, Due Year Four 16
Lessee, Operating Lease, Liability, Payments, Due Year Five 8
Finance Lease, Liability, Payments, Due Year Five 14
Lessee, Operating Lease, Liability, Payments, Due after Year Five 53
Finance Lease, Liability, Payments, Due after Year Five 249
Lessee, Operating Lease, Liability, Payments, Due 87
Finance Lease, Liability, Payment, Due 315
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (35)
Finance Lease, Liability, Undiscounted Excess Amount (162)
Operating Lease, Liability 52
Finance Lease, Liability $ 153