Leasing Activity, Operating Lease Right-of-Use (ROU) Assets and Lease Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Leases [Abstract]
ROU assets	$ 3,672		$ 3,672		$ 3,412
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets		Other assets
Lease liabilities	$ 4,255		$ 4,255		$ 4,060
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities		Other Liabilities		Other Liabilities
Total lease costs	$ 309	$ 302	$ 905	$ 916