Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Options (in millions)
Beginning balance (in shares)	16,000
Granted (in shares)	3,000
Exercised (in shares)	(1,000)
Forfeited (in shares)	0
Expired (in shares)	0
Ending balance (in shares)	18,000	16,000
Vested and expected to vest (in shares)	17,000
Vested and exercisable (in shares)	13,000
Forfeited and expired (in shares)	500
Weighted- Average Exercise Price per Share
Beginning balance (in USD per share)	$ 42.98
Granted (in USD per share)	68.25
Exercised (in USD per share)	28.29
Forfeited (in USD per share)	63.16
Expired (in USD per share)	39.30
Ending balance (in USD per share)	48.69	$ 42.98
Vested and expected to vest (in USD per share)	48.44
Vested and exercisable (in USD per share)	$ 41.51
Weighted- Average Remaining Contractual Life (in years)
Outstanding	5 years 2 months 12 days	4 years 11 months 12 days
Vested and expected to vest	5 years 1 month 13 days
Vested and exercisable	3 years 10 months 2 days
Aggregate Intrinsic Value
Beginning balance	$ 646
Vested and expected to vest	377
Vested and exercisable	355
Ending balance	$ 379	$ 646