Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans - Information on Stock Options Granted and Exercised (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Weighted-average fair value of options granted per share (in USD per share)		$ 19.72	$ 22.09	$ 19.51
Cash received from options exercised	[1]	$ 49	$ 64	$ 221
Tax benefit realized on options exercised		12	22	61
Aggregate intrinsic value of options exercised		$ 62	$ 113	$ 322

[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.