Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating lease ROU assets	$ 3,057	$ 2,654
Short-term operating lease liabilities	628	576
Long-term operating lease liabilities	$ 2,484	$ 2,117
Weighted average discount rate	5.07%	3.68%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Vehicles, net	Vehicles, net
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Total	Total
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Operating lease ROU assets	Operating lease ROU assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Operating lease ROU assets	Operating lease ROU assets
Property leases
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating lease ROU assets	$ 3,057	$ 2,654
Short-term operating lease liabilities	628	576
Long-term operating lease liabilities	2,484	2,117
Operating lease liabilities	$ 3,112	$ 2,693
Weighted average remaining lease term	8 years	8 years 1 month 6 days
Weighted average discount rate	4.98%	4.83%
Vehicle leases
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating lease ROU assets	$ 73	$ 117
Short-term operating lease liabilities	58	83
Long-term operating lease liabilities	15	36
Operating lease liabilities	$ 73	$ 119
Weighted average remaining lease term	1 year 3 months 18 days	1 year 6 months
Weighted average discount rate	5.20%	5.13%
Finance lease ROU assets, gross	$ 228	$ 265
Accumulated amortization	(43)	(41)
Finance Lease ROU assets, net	185	224
Short-term vehicle finance lease liabilities	75	59
Long-term vehicle finance lease liabilities	68	113
Total	$ 143	$ 172
Weighted average remaining lease term	2 years 1 month 6 days	2 years 9 months 18 days
Weighted average discount rate	5.07%	3.68%