Other Financial Data - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Aug. 25, 2015
Basic earnings (loss) per common share:
Earnings	$ 180,000,000	$ 131,000,000	$ 297,000,000	$ 208,000,000
Weighted average common shares outstanding (in shares)	162.2	163.1	161.7	163.7
Basic earnings per share amount (in US$ per share)	$ 1.11	$ 0.80	$ 1.83	$ 1.27
Diluted earnings per common share:
Earnings	$ 180,000,000	$ 131,000,000	$ 297,000,000	$ 208,000,000
Weighted average common shares outstanding (in shares)	162.2	163.1	161.7	163.7
Add effect of dilutive securities:
Share-based awards (in shares)	3.8	3.1	4.0	3.2
Senior Convertible Notes (in shares)	5.7	2.8	5.4	2.6
Diluted weighted average common shares outstanding (in shares)	171.7	169.0	171.1	169.5
Per share amount (in US$ per share)	$ 1.05	$ 0.78	$ 1.73	$ 1.23
Senior Convertible Notes | Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt instrument face amount					$ 1,000,000,000
Interest rate					2.00%
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of dilutive shares due to antidilutive nature (in shares)	1.4	2.1	2.9	2.4
Performance Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of dilutive shares due to antidilutive nature (in shares)	1.2	1.8	2.4	2.0