Employee Share-based Incentives - Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 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	$ 359	$ 363	$ 1,224	$ 1,169
Accrual of estimated costs of share-based awards to be granted in future periods, predominantly those to full-career eligible employees	490	419	1,507	1,317
Total noncash compensation expense related to employee share-based incentive plans	$ 849	$ 782	$ 2,731	$ 2,486