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Pension and Retiree Medical Benefits Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 15, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of net periodic benefit cost for pension and retiree medical plans are as follows: 
 
12 Weeks Ended
 
Pension
 
Retiree Medical
 
6/15/2019

 
6/16/2018

 
6/15/2019

 
6/16/2018

 
6/15/2019

 
6/16/2018

 
U.S.
 
International
 
 
Service cost
$
88

 
$
99

 
$
18

 
$
22

 
$
6

 
$
8

Interest cost
126

 
111

 
23

 
23

 
8

 
8

Expected return on plan assets
(206
)
 
(217
)
 
(45
)
 
(48
)
 
(4
)
 
(5
)
Amortization of prior service cost/(credits)
3

 
—

 
—

 
—

 
(5
)
 
(4
)
Amortization of net losses/(gains)
37

 
42

 
8

 
11

 
(6
)
 
(3
)
Total
$
48

 
$
35

 
$
4

 
$
8

 
$
(1
)
 
$
4

 
24 Weeks Ended
 
Pension
 
Retiree Medical
 
6/15/2019

 
6/16/2018

 
6/15/2019

 
6/16/2018

 
6/15/2019

 
6/16/2018

 
U.S.
 
International
 
 
Service cost
$
176

 
$
199

 
$
31

 
$
40

 
$
11

 
$
15

Interest cost
251

 
222

 
40

 
40

 
16

 
16

Expected return on plan assets
(412
)
 
(435
)
 
(78
)
 
(84
)
 
(8
)
 
(9
)
Amortization of prior service cost/(credits)
5

 
1

 
—

 
—

 
(9
)
 
(9
)
Amortization of net losses/(gains)
74

 
83

 
13

 
19

 
(12
)
 
(5
)
 
94

 
70

 
6

 
15

 
(2
)
 
8

Special termination benefits (a)
(5
)
 
3

 
—

 
1

 
—

 
—

Total
$
89

 
$
73

 
$
6

 
$
16

 
$
(2
)
 
$
8


(a)
Income amount represents adjustments for changes in estimates of previously recorded amounts.