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Retirement Plans (Schedule Of Net Periodic Benefit Cost For Pension Benefits Plan) (Details) - Pension Benefits [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 3 $ 3 $ 5
Interest cost 8 10 17 20
Expected return on plan assets (9) (14) (19) (27)
Amortization of prior service cost [1]   1 1 1
Net actuarial loss [1] 3 3 6 7
Net periodic benefit cost [2] $ 4 $ 3 $ 8 $ 6
[1] These net periodic benefit costs were reclassified out of other comprehensive earnings.
[2] The service cost component of net periodic benefit cost is included in G&A expense and the remaining components of net periodic benefit costs are included in other expenses in the accompanying consolidated comprehensive statements of earnings.