Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Operating leases:
Operating lease assets	$ 2,501	$ 2,201
Current operating lease liabilities	681	597
Long-term operating lease liabilities	2,067	1,842
Total operating lease liabilities	2,748	2,439
Finance leases:
Property and equipment, net	$ 198	$ 107
Finance lease, right-of-use asset, statement of financial position	Property and equipment, net of accumulated depreciation of $1,723 and $1,545	Property and equipment, net of accumulated depreciation of $1,723 and $1,545
Current debt	$ 37	$ 26
Finance lease, liability, current, statement of financial position	Current debt	Current debt
Long-term debt	$ 205	$ 90
Finance lease, liability, noncurrent, statement of financial position	Long-term debt	Long-term debt
Total finance lease liabilities	$ 242	$ 116