Employee Share-Based Incentives - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Noncash compensation expense related to employee stock-based incentive plans
Cost of prior grants of RSUs, PSUs, SARs and stock options that are amortized over their applicable vesting periods	$ 1,253	$ 1,161	$ 1,101
Accrual of estimated costs of share-based awards to be granted in future periods, predominantly those to full-career eligible employees	1,541	1,768	1,350
Total noncash compensation expense related to employee share-based incentive plans	2,794	$ 2,929	$ 2,451
Compensation cost related to unvested awards not charged to net income	$ 1,000
Weighted-average period for cost expected to be amortized into compensation expense	1 year 9 months 18 days