Lease Commitments - Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating Leases
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
Right-of-use asset	$ 4,262	$ 3,668
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current	Accrued Liabilities, Current
Operating lease liability, current	$ 1,111	$ 995
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Noncurrent deferred income taxes	Noncurrent deferred income taxes
Noncurrent operating lease liabilities	$ 2,920	$ 2,508
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	$ 4,031	$ 3,503
Weighted-average remaining lease term (in years)	7 years	7 years 9 months 18 days
Weighted-average discount rate	1.90%	2.20%
Finance Leases
Right-of-use asset	$ 392	$ 429
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total short-term debt	Total short-term debt
Current lease liabilities	$ 45	$ 48
Noncurrent lease liabilities	403	449
Finance lease liability	$ 448	$ 497
Weighted-average remaining lease term (in years)	11 years 10 months 24 days	13 years 2 months 12 days
Weighted-average discount rate	4.10%	4.20%
Right-of-use asset obtained in exchange for operating lease liability	$ 1,807	$ 1,063
Right-of-use asset obtained in exchange for finance lease liability	$ 3	$ 60