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Employees' Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 28, 2019
Share-based Payment Arrangement [Abstract]  
Weighted Average Black-Scholes Fair Value Assumptions
We use the Black-Scholes model to estimate the fair value of stock option grants. Our weighted average Black-Scholes fair value assumptions were:
 
December 28, 2019
 
December 29, 2018
 
December 30, 2017
Risk-free interest rate
1.46
%
 
2.75
%
 
2.25
%
Expected term
6.5 years

 
7.5 years

 
7.5 years

Expected volatility
31.2
%
 
21.3
%
 
19.6
%
Expected dividend yield
5.3
%
 
3.6
%
 
2.8
%
Weighted average grant date fair value per share
$
4.11

 
$
10.26

 
$
14.24
Schedule of Stock Option Activity and Related Information
Our stock option activity and related information was:
 
Number of Stock Options
 
Weighted Average Exercise Price
(per share)
 
Aggregate Intrinsic Value
(in millions)
 
Average Remaining Contractual Term
Outstanding at December 29, 2018
18,259,965

 
$
44.64

 
 
 
 
Granted
1,880,648

 
25.41

 
 
 
 
Forfeited
(1,771,653
)
 
66.89

 
 
 
 
Exercised
(730,460
)
 
23.81

 
 
 
 
Outstanding at December 28, 2019
17,638,500

 
41.22

 
$
42

 
4 years
Exercisable at December 28, 2019
11,539,568

 
33.89

 
51

 
3 years
Schedule of Unvested Stock Options and Related Information
Our unvested stock options and related information was:
 
Number of Stock Options
 
Weighted Average Grant Date Fair Value
(per share)
Unvested options at December 29, 2018
7,767,917

 
$
10.16

Granted
1,880,648

 
4.11

Vested
(2,140,396
)
 
7.12

Forfeited
(1,409,237
)
 
11.51

Unvested options at December 28, 2019
6,098,932

 
9.04
Schedule of RSU Activity and Related Information
Our RSU activity and related information was:
 
Number of Units
 
Weighted Average Grant Date Fair Value
(per share)
Outstanding at December 29, 2018
2,338,958

 
$
68.49

Granted
8,091,999

 
25.77

Forfeited
(959,485
)
 
50.16

Vested
(75,563
)
 
76.38

Outstanding at December 28, 2019
9,395,909

 
33.51
Schedule of PSU Activity and Related Information
Our PSU activity and related information was:
 
Number of Units
 
Weighted Average Grant Date Fair Value
(per share)
Outstanding at December 29, 2018
3,252,056

 
$
59.24

Granted
4,832,626

 
25.31

Forfeited
(1,271,023
)
 
54.67

Outstanding at December 28, 2019
6,813,659

 
36.03
Schedule of Compensation Costs Related to Equity Plans
Equity award compensation cost and the related tax benefit was (in millions):
 
December 28, 2019
 
December 29, 2018
 
December 30, 2017
Pre-tax compensation cost
$
46

 
$
33

 
$
46

Related tax benefit
(9
)
 
(7
)
 
(14
)
After-tax compensation cost
$
37

 
$
26

 
$
32