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Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2019
Defined Benefit Plan [Abstract]  
Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans
(In millions)Three Months Ended June 30,Six Months Ended June 30,
2019 2018 2019 2018 
Interest cost$$$$
Expected return on plan assets(2)(3)(4)(6)
Partial settlement loss
— — — 
Amortization of net actuarial loss
Net periodic cost (benefit)
$— $(1)$— $(1)