Schedule of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income attributable to common shareholders	$ 488	$ 423	$ 435
Denominator:
Basic weighted average common stock	85.0	87.1	87.5
Added: Weighted average stock options/share awards	0.2	0.2	0.2
Diluted weighted average common stock	85.2	87.2	87.7
Net earnings per share - basic	$ 5.74	$ 4.86	$ 4.97
Net earnings per share - diluted	$ 5.72	$ 4.85	$ 4.96