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Employee Benefits (Tables)
 3 Months Ended
Mar. 28, 2020
Retirement Benefits [Abstract]  
Components of Plan Benefit Expense
Pension
 
Quarter ended
(millions)
March 28, 2020
March 30, 2019
Service cost
$
9

$
9

Interest cost
35

45

Expected return on plan assets
(85
)
(85
)
Amortization of unrecognized prior service cost
2

2

Recognized net (gain) loss
14

1

Total pension (income) expense
$
(25
)
$
(28
)

Other nonpension postretirement
 
Quarter ended
(millions)
March 28, 2020
March 30, 2019
Service cost
$
3

$
3

Interest cost
8

10

Expected return on plan assets
(23
)
(21
)
Amortization of unrecognized prior service cost
(2
)
(2
)
Total postretirement benefit (income) expense
$
(14
)
$
(10
)

Postemployment
 
Quarter ended
(millions)
March 28, 2020
March 30, 2019
Service cost
$
1

$
1

Interest cost
—

—

Recognized net (gain) loss
(1
)
(1
)
Total postemployment benefit expense
$
—

$
—
Contributions to Employee Benefit Plans
Company contributions to employee benefit plans are summarized as follows:
(millions)
Pension
Nonpension postretirement
Total
Quarter ended:
 
 
 
March 28, 2020
$
3

$
3

$
6

March 30, 2019
$
1

$
4

$
5

Full year:
 
 
 
Fiscal year 2020 (projected)
$
7

$
19

$
26

Fiscal year 2019 (actual)
$
10

$
18

$
28