Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating lease right-of-use assets	$ 3,239	$ 3,057
Short-term operating lease liabilities	680	628
Long-term operating lease liabilities	$ 2,614	$ 2,484
Weighted average discount rate	3.81%	5.07%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other	Other
Property leases
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating lease right-of-use assets	$ 3,239	$ 3,057
Short-term operating lease liabilities	680	628
Long-term operating lease liabilities	2,614	2,484
Operating lease liabilities	$ 3,294	$ 3,112
Weighted average remaining lease term	7 years 7 months 6 days	8 years
Weighted average discount rate	5.35%	4.98%
Vehicle leases
Supplemental Balance Sheet Information Related to Leases [Line Items]
Operating lease right-of-use assets	$ 42	$ 73
Short-term operating lease liabilities	35	58
Long-term operating lease liabilities	7	15
Operating lease liabilities	$ 42	$ 73
Weighted average remaining lease term	1 year 2 months 12 days	1 year 3 months 18 days
Weighted average discount rate	4.54%	5.20%
Vehicle finance lease right-of-use assets, gross	$ 209	$ 228
Accumulated amortization	(37)	(43)
Finance Lease ROU assets, net	172	185
Short-term vehicle finance lease liabilities	79	75
Long-term vehicle finance lease liabilities	51	68
Total	$ 130	$ 143
Weighted average remaining lease term	1 year 4 months 24 days	2 years 1 month 6 days
Weighted average discount rate	3.81%	5.07%
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Vehicles, net	Vehicles, net
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Debt	Debt
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Receivables from vehicle manufacturers and other	Receivables from vehicle manufacturers and other