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Benefit Plans (Schedule Of Components Of Net Periodic Benefit Cost (Income)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 17 $ 18 $ 34 $ 37
Interest cost 47 63 93 126
Expected return on plan assets (131) (125) (262) (251)
Amortization:        
Net loss 33 26 66 53
Prior service cost (credit) 1 1 2 2
Net periodic benefit (income) cost (33) (17) (67) (33)
Postretirement [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 4 10 8
Interest cost 10 15 21 30
Expected return on plan assets (4) (4) (8) (7)
Amortization:        
Net loss 7 4 14 7
Prior service cost (credit) (9) (8) (15) (15)
Net periodic benefit (income) cost $ 9 $ 11 $ 22 $ 23