Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Property leases
Operating lease ROU assets	$ 2,754	$ 2,654
Short-term operating lease liabilities	567	576
Long-term operating lease liabilities	2,234	2,117
Operating lease liabilities	$ 2,801	$ 2,693
Weighted average remaining lease term	7 years 9 months 18 days	8 years 1 month 6 days
Weighted average discount rate	4.92%	4.83%
Operating lease, liability, current, statement of financial position [extensible enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current