Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income	$ 309	$ 321	$ 248	$ 258	$ 630	$ 506
Denominator:
Shares outstanding at the beginning of the period (in shares)		57.7		58.1			57.4	57.9
Weighted-average number of shares issued:
Stock-based compensation (in shares)	0.0		0.0		0.2	0.2
Stock purchases (in shares)	0.0		(0.3)		0.0	(0.2)
Denominator for basic net income per share (in shares)	57.7		57.8		57.6	57.9
Effect of dilutive securities:
Stock-based compensation (in shares)	0.2		0.6		0.4	0.7
Denominator for diluted net income per share (in shares)	57.9		58.4		58.0	58.6
Net income per share:
Net income per share - Basic (in dollars per share)	$ 5.37		$ 4.29		$ 10.95	$ 8.74
Net income per share - Diluted (in dollars per share)	$ 5.35		$ 4.25		$ 10.87	$ 8.63