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Leases - Schedule of undiscounted cash flows to the finance lease liabilities and operating lease liabilities (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Operating Lease Liabilities, Payments Due [Abstract]  
Year 1 $ 388
Year 2 339
Year 3 279
Year 4 221
Year 5 175
Thereafter 1,038
Total minimum lease payments 2,440
Less: amount of lease payments representing interest (656)
Present value of future minimum lease payments 1,784
Less: current obligations under leases (344)
Long-term lease obligations 1,440
Finance Lease Liabilities, Payments, Due [Abstract]  
Year 1 107
Year 2 102
Year 3 97
Year 4 57
Year 5 61
Thereafter 353
Total minimum lease payments 777
Less: amount of lease payments representing interest (237)
Present value of future minimum lease payments 540
Less: current obligations under leases (89)
Long-term lease obligations $ 451