Employee Incentive Plans - Summary of Information for Stock Options Outstanding (Details) - Employee Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options Outstanding
Number (in shares)	6,992	8,490	9,742	11,438
Total intrinsic value	$ 1,012
Weighted average exercise price (in dollars per share)	$ 186.54	$ 169.47	$ 152.40	$ 136.19
Weighted average remaining contractual life	6 years 2 months 12 days
Options Exercisable
Number (in shares)	4,410	5,612	6,837
Total intrinsic value	$ 716
Weighted average exercise price (in dollars per share)	$ 168.97	$ 152.92	$ 137.08
Weighted average remaining contractual life	4 years 10 months 24 days