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Retirement Plans (Schedule Of Other Pre-Tax Changes Recognized In Other Comprehensive Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss)/gain - OCI $ (88) $ (40) $ 67
Amortization of prior service cost/(credit) - OCI
Amortization of actuarial loss - OCI 67 93 81
Total other pre-tax changes recognized in other comprehensive income (21) 53 148
OPEB [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Prior service credit 92    
Net actuarial (loss)/gain - OCI (11) 20 (6)
Amortization of prior service cost/(credit) - OCI (7) 1 1
Amortization of actuarial loss - OCI 7 10 9
Total other pre-tax changes recognized in other comprehensive income $ 81 $ 31 $ 4