Share-Based Compensation - Summary of Changes In Stock Options (Detail) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Shares
Shares outstanding, beginning balance (in shares) | shares	6.5
Granted (in shares) | shares	0.5
Exercised (in shares) | shares	0.0
Forfeited (in shares) | shares	(0.4)
Shares outstanding, ending balance (in shares) | shares	6.6
Options exercisable, end of year (in shares) | shares	4.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in USD per share) | $ / shares	$ 23
Weighted-average exercise price, granted (in USD per share) | $ / shares	13
Weighted-average exercise price, exercised (in USD per share) | $ / shares	0
Weighted-average exercise price, forfeited (in USD per share) | $ / shares	24
Weighted average exercise price, ending balance (in USD per share) | $ / shares	22
Weighted average exercise price, options exercisable, end of year (in USD per share) | $ / shares	$ 21
Weighted average remaining life, outstanding (years)	6 years 10 months 24 days
Weighted average remaining life, exercisable (years)	6 years 4 months 24 days
Aggregate intrinsic value, outstanding | $	$ 0.0
Aggregate intrinsic value, exercisable | $	$ 0.0