Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock-based compensation awards
Stock-based compensation expense, before tax (in dollars)	$ 40	$ 42
Risk-free interest rates, low end of range (as a percent)	1.03%	0.06%
Risk-free interest rates, high end of range (as a percent)	2.00%	1.41%
Rate of volatilities, Minimum	25.30%	29.20%
Rate of volatilities, Maximum	36.80%	45.80%
Assumptions used in determining the fair value of the stock-based awards
Weighted-average dividend yield (as a percent)	2.60%	2.60%
Weighted-average volatility (as a percent)	31.70%	32.90%
Rate of volatilities, Minimum	25.30%	29.20%
Rate of volatilities, Maximum	36.80%	45.80%
Risk-free interest rates, low end of range (as a percent)	1.03%	0.06%
Risk-free interest rates, high end of range (as a percent)	2.00%	1.41%
Weighted-average expected lives (in years)	8 years	8 years
Unrecognized compensation cost related to nonvested stock-based compensation awards (in dollars)	$ 299
Term of amortization of unrecognized compensation cost over weighted-average remaining requisite service periods (in years)	1 year 9 months 18 days
Stock Options
Stock-based compensation awards
Shares Granted (in shares)	1,029,202	1,084,821
Weighted-Average Fair Value Per Share (in dollars per share)	$ 51.69	$ 56.30
Weighted-Average Grant Date Stock Price (in dollars per share)	196.70	219.76
RSUs
Stock-based compensation awards
Weighted-Average Grant Date Stock Price (in dollars per share)	$ 196.70	$ 219.76
Shares Granted (in shares)	484,025	448,311
Weighted-Average Fair Value Per Share (in dollars per share)	$ 196.70	$ 219.76
PRSUs
Stock-based compensation awards
Weighted-Average Grant Date Stock Price (in dollars per share)	$ 196.70	$ 219.76
Shares Granted (in shares)	258,900	266,894
Weighted-Average Fair Value Per Share (in dollars per share)	$ 196.70	$ 219.76