Share-Based Compensation Plans - Schedule of stock option activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Units
Outstanding, beginning of year (in shares)	12,893,412
Granted (in shares)	1,352,039
Exercised (in shares)	(1,039,998)
Forfeited or expired (in shares)	(909,792)
Outstanding, end of year (in shares)	12,295,661	12,893,412
Exercisable, end of year (in shares)	9,810,882
Weighted Average Exercise Price
Outstanding, beginning of year (in dollars per share)	$ 48.94
Granted (in dollars per share)	59.72
Exercised (in dollars per share)	41.29
Forfeited or expired (in dollars per share)	50.13
Outstanding, end of year (in dollars per share)	50.69	$ 48.94
Exercisable, end of year (in dollars per share)	$ 47.95
Stock Option Activity, Additional Disclosures
Weighted Average Remining Contractual Life	6 years 9 months 21 days	6 years 11 months 12 days
Weighted Average Remaining Contractual Life, options exercisable, end of year (years)	6 years 2 months 26 days
Aggregate Intrinsic Value, options outstanding, end of year	$ 210
Aggregate Intrinsic Value, options exercisable, end of year	$ 194