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Leases Maturity of lease liabilities (Details) $ in Millions | Mar. 31, 2019 USD ($)
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Finance Lease Liabilities, Payments, Due [Abstract] |
Finance Lease, Liability, Payments, Remainder of Fiscal Year | $ 50
Finance Lease, Liability, Payments, Due Year Two | 65
Finance Lease, Liability, Payments, Due Year Three | 62
Finance Lease, Liability, Payments, Due Year Four | 58
Finance Lease, Liability, Payments, Due Year Five | 56
Finance Lease, Liability, Payments, Due after Year Five | 786
Finance Lease, Liability, Payments, Due | 1,077
Finance Lease, Liability, Undiscounted Excess Amount | (517)
Finance Lease, Liability | 560
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 2,035
Lessee, Operating Lease, Liability, Payments, Due Year Two | 2,612
Lessee, Operating Lease, Liability, Payments, Due Year Three | 2,477
Lessee, Operating Lease, Liability, Payments, Due Year Four | 2,316
Lessee, Operating Lease, Liability, Payments, Due Year Five | 2,203
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 16,588
Lessee, Operating Lease, Liability, Payments, Due | 28,231
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | (7,467)
Operating Lease, Liability | 20,764
Lessee, Liability, Payments, Remainder of Fiscal Year | 2,085
Lessee, Liability, Payments, Due Year Two | 2,677
Lessee, Liability, Payments, Due Year Three | 2,539
Lessee, Liability, Payments, Due Year Four | 2,374
Lessee, Liability, Payments, Due Year Five | 2,259
Lessee, Liability, Payments, Due After Year Five | 17,374
Lessee, Liability, Payments, Due | 29,308
Lessee, Liability, Undiscounted Excess Amount | (7,984)
Lease, Liability | 21,324
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals | 182
Operating And Capital Leases, Amount Due In Excess Of Remaining Estimated Economic Life | $ 2,100

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