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Segment and Related Information - Geographical (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Geographical
Operating revenues	$ 22,063	$ 20,426	$ 19,698
Property and equipment, net	19,340	16,968
U.S.
Geographical
Operating revenues	21,107	19,595	18,860
Property and equipment, net	17,995	15,903
Canada
Geographical
Operating revenues	852	813	$ 838
Property and equipment, net	1,222	1,060
Western Europe and other
Geographical
Operating revenues	104	18
Property and equipment, net	$ 123	$ 5

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