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Leases - Schedule of undiscounted cash flows to the finance lease liabilities and operating lease liabilities (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Operating Lease Liabilities, Payments Due [Abstract]  
Year 1 $ 411
Year 2 350
Year 3 285
Year 4 228
Year 5 182
Thereafter 1,074
Total minimum lease payments 2,530
Less: amount of lease payments representing interest (681)
Present value of future minimum lease payments 1,849
Less: current obligations under leases (350)
Long-term lease obligations 1,499
Finance Lease Liabilities, Payments, Due [Abstract]  
Year 1 110
Year 2 105
Year 3 99
Year 4 58
Year 5 60
Thereafter 368
Total minimum lease payments 800
Less: amount of lease payments representing interest (243)
Present value of future minimum lease payments 557
Less: current obligations under leases (87)
Long-term lease obligations $ 470