Employee Share-based Incentives - Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Cost of prior grants of restricted stock units (“RSUs”), performance share units (“PSUs”) and stock appreciation rights (“SARs”) that are amortized over their applicable vesting periods	$ 430	$ 449	$ 865	$ 806
Accrual of estimated costs of share-based awards to be granted in future periods, predominantly those to full-career eligible employees	514	385	1,017	898
Total noncash compensation expense related to employee share-based incentive plans	$ 944	$ 834	$ 1,882	$ 1,704