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Retirement Plans (Schedule Of Assets Measured At Fair Value On A Recurring Basis) (Details) - Pension [Member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 5,016 $ 4,528 $ 3,887
Temporary Cash Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 7  
Registered Investment Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 252 9  
Federal Government Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 150 202  
Bonds and Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 831 575  
Corporate Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,217 1,939  
Total Plan Assets At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,459 2,732  
Other Assets (Liabilities) - Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 1 12  
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Temporary Cash Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 6  
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Registered Investment Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 252 9  
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Federal Government Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Bonds and Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Corporate Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,209 1,932  
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Total Plan Assets At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,470 1,947  
Significant Other Observable Inputs (Level 2) [Member] | Temporary Cash Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1  
Significant Other Observable Inputs (Level 2) [Member] | Registered Investment Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]  
Significant Other Observable Inputs (Level 2) [Member] | Federal Government Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 150 202  
Significant Other Observable Inputs (Level 2) [Member] | Bonds and Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 831 575  
Significant Other Observable Inputs (Level 2) [Member] | Corporate Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 7  
Significant Other Observable Inputs (Level 2) [Member] | Total Plan Assets At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 989 785  
Significant Unobservable Inputs (Level 3) [Member] | Temporary Cash Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Significant Unobservable Inputs (Level 3) [Member] | Registered Investment Companies [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]  
Significant Unobservable Inputs (Level 3) [Member] | Federal Government Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Significant Unobservable Inputs (Level 3) [Member] | Bonds and Debentures [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Significant Unobservable Inputs (Level 3) [Member] | Corporate Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Significant Unobservable Inputs (Level 3) [Member] | Total Plan Assets At Fair Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets  
Fair Value Measured at Net Asset Value Per Share [Member] | Registered Investment Companies - NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 312 285  
Fair Value Measured at Net Asset Value Per Share [Member] | Venture Capital And Buyout Partnerships [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 585 531  
Fair Value Measured at Net Asset Value Per Share [Member] | Real Estate Partnerships [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 161 261  
Fair Value Measured at Net Asset Value Per Share [Member] | Collective Trust And Other Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 498 707  
Fair Value Measured at Net Asset Value Per Share [Member] | Total Plan Assets at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,556 $ 1,784  
[1] Registered investment companies measured at fair value are stock investments.
[2] Other assets include accrued receivables, net payables, and pending broker settlements
[3] Registered investment companies measured at NAV include bond investments.