Employee Share-based Incentives - Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
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	$ 357	$ 271
Accrual of estimated costs of share-based awards to be granted in future periods, predominantly those to full-career eligible employees	513	535
Total noncash compensation expense related to employee share-based incentive plans	$ 870	$ 806