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Leases - Schedule of undiscounted cash flows to the finance lease liabilities and operating lease liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Lease Liabilities, Payments Due [Abstract]    
Year 1 $ 431 $ 411
Year 2 366 350
Year 3 307 285
Year 4 255 228
Year 5 207 182
Thereafter 1,136 1,074
Total minimum lease payments 2,702 2,530
Less: amount of lease payments representing interest (650) (681)
Present value of future minimum lease payments 2,052 1,849
Less: current obligations under leases (379) (350)
Long-term lease obligations 1,673 1,499
Finance Lease Liabilities, Payments, Due [Abstract]    
Year 1 155 110
Year 2 125 105
Year 3 81 99
Year 4 82 58
Year 5 51 60
Thereafter 353 368
Total minimum lease payments 847 800
Less: amount of lease payments representing interest (225) (243)
Present value of future minimum lease payments 622 557
Less: current obligations under leases (128) (87)
Long-term lease obligations $ 494 $ 470