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Operating Expenses - Schedule Of Operating Expenses By Nature (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of attribution of expenses by nature to their function [line items]      
Depreciation and amortization $ 1,127 $ 1,110 $ 1,039
Other operating expenses (116) (1,767) (334)
Operating expenses 2,939 2,811 2,946
Operating Expenses [Member]      
Disclosure of attribution of expenses by nature to their function [line items]      
Transportation costs 1,502 1,313 1,371
Payroll 915 945 961
Depreciation and amortization 191 195 180
Professional legal, accounting and advisory services 145 176 180
Maintenance, repairs and supplies 78 74 78
Other operating expenses 108 108 176
Operating expenses $ 2,939 $ 2,811 $ 2,946