Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Property leases
Operating lease ROU assets	$ 2,886	$ 2,654
Short-term operating lease liabilities	583	576
Long-term operating lease liabilities	2,351	2,117
Operating lease liabilities	$ 2,934	$ 2,693
Weighted average remaining lease term	7 years 10 months 24 days	8 years 1 month 6 days
Weighted average discount rate	5.01%	4.83%
Operating lease, liability, current, statement of financial position [extensible enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current