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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans
 
Pension and Other Retirement Plans
(In millions)
Three Months Ended March 31,
2017
 
2016
 
 
 
 
Interest cost
$
2


$
2

Expected return on plan assets
(3
)

(3
)
Partial settlement loss
1

 
—

Amortization of net actuarial gain
1


2

Net periodic benefit cost
$
1

 
$
1