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Retirement Plans (Fair Value Of Plan Assets By Investment Category And The Corresponding Level Within The Fair Value Hierarchy) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation And Retirement Disclosure Line Items      
Maximum equity holding percentage of total fair value 1.00% 1.00%  
Significant Unobservable Inputs (Level 3)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets $ 164 $ 157 $ 154
Significant Unobservable Inputs (Level 3) | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 42 42 42
Significant Unobservable Inputs (Level 3) | Insurance Deposit Agreements      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 109 103 103
Significant Unobservable Inputs (Level 3) | Private Equity Investments      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 13 12 9
Pension Benefits      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 8,980 8,608 9,084
Pension plan assets, excluding NAV 8,301 7,825  
Pension Benefits | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 4,285 4,006  
Pension Benefits | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 567 560  
Pension Benefits | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 42 42  
Pension plan assets, measured using NAV 365 338  
Pension Benefits | Hedge Funds      
Compensation And Retirement Disclosure Line Items      
Pension plan assets, measured using NAV 314 445  
Pension Benefits | Insurance Deposit Agreements      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 109 103  
Pension Benefits | U.S. Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [1] 786 675  
Pension Benefits | International Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 74 64  
Pension Benefits | Private Equity Investments      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 13 12  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 870 751  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance Deposit Agreements      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [1] 786 675  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | International Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 74 64  
Pension Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private Equity Investments      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 7,267 6,917  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 4,285 4,006  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 567 560  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Insurance Deposit Agreements      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2) | U.S. Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [1] 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2) | International Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Other Observable Inputs (Level 2) | Private Equity Investments      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 164 157  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 42 42  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Insurance Deposit Agreements      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 109 103  
Pension Benefits | Significant Unobservable Inputs (Level 3) | U.S. Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [1] 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | International Companies      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Significant Unobservable Inputs (Level 3) | Private Equity Investments      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 13 12  
Pension Benefits | Cash      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 71 116  
Pension Benefits | Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 10 12  
Pension Benefits | Cash | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 61 104  
Pension Benefits | Cash | Significant Unobservable Inputs (Level 3)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Treasury Securities      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 239 261  
Pension Benefits | Treasury Securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Treasury Securities | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 239 261  
Pension Benefits | Treasury Securities | Significant Unobservable Inputs (Level 3)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Pension Benefits | Corporate Bonds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [2] 2,115 1,986  
Pension Benefits | Corporate Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [2] 0 0  
Pension Benefits | Corporate Bonds | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [2] 2,115 1,986  
Pension Benefits | Corporate Bonds | Significant Unobservable Inputs (Level 3)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets [2] 0 0  
Other Post-retirement Benefits      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 499 527 $ 553
Pension plan assets, excluding NAV 497 524  
Other Post-retirement Benefits | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 2 2  
Pension plan assets, measured using NAV 1 1  
Other Post-retirement Benefits | Hedge Funds      
Compensation And Retirement Disclosure Line Items      
Pension plan assets, measured using NAV 1 2  
Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 71 79  
Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 2 2  
Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 426 445  
Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2) | Real Estate Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Other Post-retirement Benefits | Cash      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 10 79  
Other Post-retirement Benefits | Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Other Post-retirement Benefits | Cash | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 10 79  
Equity Securities | Other Post-retirement Benefits      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 69 77  
Equity Securities | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 69 77  
Equity Securities | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Fixed Income Securities | Other Post-retirement Benefits      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 88 21  
Fixed Income Securities | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Fixed Income Securities | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2)      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 88 21  
Comingled Funds | Other Post-retirement Benefits | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 236 246  
Comingled Funds | Other Post-retirement Benefits | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 92 99  
Comingled Funds | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Comingled Funds | Other Post-retirement Benefits | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 0 0  
Comingled Funds | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2) | Equity Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets 236 246  
Comingled Funds | Other Post-retirement Benefits | Significant Other Observable Inputs (Level 2) | Fixed Income Funds      
Compensation And Retirement Disclosure Line Items      
Total pension plan assets $ 92 $ 99  
[1] No single equity holding amounted to more than 1 percent of the total fair value.
[2] Our corporate bond investments had an average rating of BBB+.