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Share-Based Compensation - Weighted-Average Assumptions Used for Grants of Stock Options and SARs (Detail) - SARs - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Forfeiture rate 8.40% 9.37%
Volatility 35.93% 35.49%
Risk free interest rate 2.96% 1.77%
Risk free interest rate, minimum 1.68% 0.71%
Risk free interest rate, maximum 3.00% 2.41%
Expected weighted-average life 4 years 1 month 10 days 4 years 1 month 17 days
Fair value of SARs granted $ 13 $ 12
Weighted-average grant date fair value of SARs granted (per underlying share) (USD per share) $ 47.59 $ 29.84