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Lease Commitments - Balance Sheets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating Leases    
Right-of-use asset $ 5,315 $ 5,422
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Liabilities, Current Accrued Liabilities, Current
Operating lease liability, current $ 1,519 $ 1,538
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Noncurrent deferred income taxes Noncurrent deferred income taxes
Noncurrent operating lease liabilities $ 3,551 $ 3,696
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt and Lease Obligation, Including Current Maturities Long-Term Debt and Lease Obligation, Including Current Maturities
Total operating lease liabilities $ 5,070 $ 5,234
Weighted-average remaining lease term (in years) 6 years 3 months 18 days 6 years 8 months 12 days
Weighted-average discount rate 3.70% 3.30%
Finance Leases    
Right-of-use asset $ 570 $ 583
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total short-term debt Total short-term debt
Current lease liabilities $ 58 $ 60
Noncurrent lease liabilities 546 574
Total lease liabilities $ 604 $ 634
Weighted-average remaining lease term (in years) 13 years 2 months 12 days 12 years 7 months 6 days
Weighted-average discount rate 4.60% 4.50%
Right-of-use asset obtained in exchange for operating lease liability $ 2,205 $ 2,556
Right-of-use asset obtained in exchange for finance lease liability $ 40 $ 233