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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 29, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit (income)/expense are as follows:
 
First Quarter Ended
 
March 29, 2015
 
March 30, 2014
 
March 29, 2015
 
March 30, 2014
 
Pension Benefits
 
Other Retiree Benefits
 
(In millions)
Service cost
$
6

 
$
7

 
$
1

 
$
1

Interest cost
26

 
35

 
2

 
2

Expected return on plan assets
(48
)
 
(55
)
 
—

 
—

Amortization of prior service cost/(credit)
—

 
—

 
(1
)
 
(2
)
Amortization of unrecognized (gain)/loss
1

 
—

 
—

 
—

Settlements
—

 
—

 
—

 
—

Net periodic benefit (income)/expense
$
(15
)
 
$
(13
)
 
$
2

 
$
1