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Pension and Retiree Medical Benefits Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 21, 2020
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
 
U.S.
 
International
 
 
 
3/21/2020

 
3/23/2019

 
3/21/2020

 
3/23/2019

 
3/21/2020

 
3/23/2019

Service cost
$
100

 
$
88

 
$
17

 
$
13

 
$
6

 
$
5

Other pension and retiree medical benefits expense/(income):
 
 
 
 
Interest cost
100

 
125

 
16

 
17

 
6

 
8

Expected return on plan assets
(214
)
 
(206
)
 
(37
)
 
(33
)
 
(4
)
 
(4
)
Amortization of prior service cost/(credits)
3

 
2

 
—

 
—

 
(3
)
 
(4
)
Amortization of net losses/(gains)
45

 
37

 
10

 
5

 
(5
)
 
(6
)
Special termination benefits (a)
6

 
(5
)
 
—

 
—

 
—

 
—

Total other pension and retiree medical benefits income
(60
)
 
(47
)
 
(11
)
 
(11
)
 
(6
)
 
(6
)
Total
$
40

 
$
41

 
$
6

 
$
2

 
$
—

 
$
(1
)