Equity Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity Incentive Plans
Common stock authorized for stock-based awards (in shares)	110.8
Common stock reserved for further issuance (in shares)	12.3
Stock Options
Equity Incentive Plans
Vesting period of options granted	3 years
Expiration term for options	10 years
Weighted average grant date fair value of options granted (in dollars per share)	$ 31.45	$ 21.16	$ 15.61
Intrinsic value of options exercised	$ 79	$ 107	$ 112
Risk-free rate, high end of the range (as a percent)	5.60%	4.80%	1.70%
Weighted average volatility (as a percent)	24.90%	23.20%	23.00%
Weighted average expected term	5 years 9 months 18 days	5 years 10 months 24 days	7 years 6 months
Restricted stock units
Equity Incentive Plans
Weighted average grant date fair value, granted (in dollars per share)	$ 132.65	$ 123.98	$ 108.99
Total fair value of restricted stock and restricted stock units vested	$ 49	$ 59	$ 35
Performance stock awards
Equity Incentive Plans
Weighted average grant date fair value, granted (in dollars per share)	$ 136.62	$ 123.08	$ 107.14
Total fair value of restricted stock and restricted stock units vested	$ 41	$ 87	$ 70
Risk-free rate, high end of the range (as a percent)	1.70%
Expected volatility rate (as a percent)	24.80%
Weighted average volatility (as a percent)	29.90%
Weighted average expected term	2 years 10 months 24 days