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Leases - Schedule of undiscounted cash flows to the finance lease liabilities and operating lease liabilities (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Operating Lease Liabilities, Payments Due [Abstract]  
2019 $ 294
2020 370
2021 315
2022 254
2023 198
Thereafter 1,265
Total minimum lease payments 2,696
Less: amount of lease payments representing interest (892)
Present value of future minimum lease payments 1,804
Less: current obligations under leases (310)
Long-term lease obligations 1,494
Finance Lease Liabilities, Payments, Due [Abstract]  
2019 72
2020 92
2021 71
2022 62
2023 52
Thereafter 318
Total minimum lease payments 667
Less: amount of lease payments representing interest (109)
Present value of future minimum lease payments 558
Less: current obligations under leases (39)
Long-term lease obligations $ 519