Stock-Based Compensation (Tables)
 12 Months Ended
Jan. 02, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-based Compensation Expense
The Company's total stock-based compensation expense for fiscal years 2015, 2014 and 2013 by income statement line item was as follows (in millions):
 
2015
 
2014
 
2013
Cost of sales
$
6

 
$
6

 
$
5

Selling, general and administrative expense
137

 
49

 
45

Research and development expense
17

 
16

 
15

  Stock-based compensation expense
$
160

 
$
71

 
$
65
Schedule of Weighted Average Fair Values
The following table provides the weighted average grant date fair values of the Company's restricted stock awards, restricted stock units and ESPP purchase rights during fiscal years 2015, 2014 and 2013, excluding Thoratec-related awards:
 
2015
 
2014
 
2013
Weighted average grant date fair values:
 
 
 
 
 
  Restricted stock awards
$
71.77

 
$
63.48

 
$
42.26

  Restricted stock units
$
61.79

 
$
69.08

 
$
59.04

  ESPP purchase rights
$
16.91

 
$
15.46

 
$
13.06
Schedule of Stock Option Assumptions
The following table includes the weighted average grant date fair value of stock options granted to employees during fiscal years 2015, 2014 and 2013 and the related weighted average assumptions used in the Black-Scholes model:
 
2015
 
2014
 
2013
Fair value of options granted
$
12.54

 
$
14.56

 
$
13.83

Assumptions:
 
 
 
 
 
  Expected term (years)
5.4

 
5.4

 
5.4

  Risk-free interest rate
1.7
%
 
1.7
%
 
1.6
%
  Volatility
24.7
%
 
24.9
%
 
28.6
%
  Dividend yield
1.8
%
 
1.6
%
 
1.8
%
Schedule of Stock Option Activity
The following table summarizes stock option activity under all stock-based compensation plans during the fiscal year ended January 2, 2016:
 
 
 
 
 
Weighted
 
 
 
 
 
Weighted
 
Average
 
Aggregate
 
 
 
Average
 
Remaining
 
Intrinsic
 
Options
 
Exercise
 
Contractual
 
Value
 
(shares in millions)
 
Price
 
Term (in years)
 
(in millions)
Outstanding as of January 3, 2015
17.7

 
$
44.70

 
 
 
 
  Granted
2.7

 
61.76

 
 
 
 
  Exercised
(3.1
)
 
39.06

 
 
 
 
  Forfeited and expired
(0.5
)
 
53.75

 
 
 
 
Outstanding as of January 2, 2016
16.8

 
$
48.22

 
4.9
 
$
247

Vested and expected to vest
16.1

 
$
47.59

 
4.8
 
$
245

Exercisable as of January 2, 2016
10.3

 
$
40.76

 
3.6
 
$
221
Schedule of Restricted Stock Units and Restricted Stock Award Activity
The following table summarizes activity for restricted stock awards and restricted stock units under all stock-based compensation plans during the fiscal year ended January 2, 2016, excluding the Company's Thoratec-related awards:
 
Restricted Stock
 
Weighted Average
 
Units and Awards
 
Grant Date
 
(shares in millions)
 
Fair Value
Unvested balance as of January 3, 2015
1.5

 
$
56.36

Granted
0.6

 
62.10

Vested
(0.5
)
 
51.56

Forfeited
(0.1
)
 
57.30

Unvested balance as of January 2, 2016
1.5

 
$
60.65