Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Incentive Compensation Plans (Narrative) (Details)

v3.10.0.1
Stock-Based Incentive Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units, shares granted (in shares) 1.0 1.5 3.0 2.1
Restricted stock units, shares granted, weighted average grant date fair value (in usd per share) $ 12.67 $ 12.06 $ 12.25 $ 12.18
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock purchased under ESPP (in shares) 2.2      
Purchase price of common stock purchased under ESPP (in usd per share) $ 9.57   $ 9.57  
Cash proceeds from purchases under ESPP $ 21