Earnings (Loss) Per Share - Computation (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic:
Net income (loss)									$ 421	$ 17	$ (137)
Weighted-average shares outstanding									53,591,655	53,021,761	51,579,112
Basic earnings (loss) per share (in USD per share)	$ 2.14	$ 2.37	$ 1.31	$ 2.04	$ 0.07	$ (0.23)	$ 0.33	$ 0.16	$ 7.86	$ 0.33	$ (2.65)
Diluted:
Net income (loss)									$ 421	$ 17	$ (137)
Weighted-average shares outstanding									53,591,655	53,021,761	51,579,112
Dilutive shares									708,157	667,071	0
Diluted weighted average shares outstanding (in shares)									54,299,812	53,688,832	51,579,112
Diluted earnings (loss) per share (in USD per share)	$ 2.11	$ 2.34	$ 1.29	$ 2.01	$ 0.07	$ (0.23)	$ 0.32	$ 0.16	$ 7.76	$ 0.32	$ (2.65)