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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Defined Benefit Plan [Abstract]  
Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans
(In millions)
Three Months Ended September 30,
 
Nine Months Ended September 30,
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Interest cost
$
2


$
2

 
$
5

 
$
5

Expected return on plan assets
(3
)

(3
)
 
(9
)
 
(9
)
Partial settlement loss
1

 
3

 
2

 
3

Amortization of net actuarial loss
1


1

 
4

 
5

Net periodic benefit cost
$
1

 
$
3

 
$
2

 
$
4