Stock Compensation - Stock Options and RSUs Outstanding (Details) - Long-term incentive and director compensation plans - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Stock Option
Stock Options, Shares
Options outstanding, Beginning balance (in shares)	26
Granted (in shares)	5
Exercised (in shares)	(6)
Options outstanding, Ending balance (in shares)	25	26
Stock Options, Weighted Average Exercise Price per Share
Weighted-average exercise price, Outstanding, Beginning of period (in dollars per share)	$ 119.60
Weighted-average exercise price, Granted (in dollars per share)	167.68
Weighted-average exercise price, Exercised (in dollars per share)	82.42
Weighted-average exercise price, Outstanding, End of period (in dollars per share)	$ 136.87	$ 119.60
Restricted Stock Units, Weighted Average Grant Date Fair Value per Share
Aggregate intrinsic values of options exercised	$ 597	$ 319	$ 336
Restricted Stock Units (RSUs)
Restricted Stock Units, Shares
Awards outstanding other than options, Beginning balance (in shares)	5
Granted (in shares)	2
Vested (in shares)	(1)
Awards outstanding other than options, Ending balance (in shares)	6	5
Restricted Stock Units, Weighted Average Grant Date Fair Value per Share
Weighted-average grant date fair value, Beginning of period (in dollars per share)	$ 161.40
Weighted-average grant-date fair value, Granted (in dollars per share)	173.59	$ 172.59	$ 174.39
Weighted-average grant date fair value, Vested (in dollars per share)	131.82
Weighted-average grant date fair value, Ending of period (in dollars per share)	168.68	161.40
Weighted-average grant-date fair value, Granted (in dollars per share)	$ 173.59	$ 172.59	$ 174.39
Total fair values of shares vested from RSU lapses	$ 113	$ 106	$ 121