Pension and Postretirement Plans (Schedule Of Pension Plan Assets Measured At Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 1,718 | $ 1,650 | |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 543 | 657 | |
Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 844 | 763 | |
Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 331 | 230 | |
United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 66 | 70 | $ 71 |
United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 34 | |
United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 66 | 36 | |
United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 1,652 | 1,580 | 1,491 |
International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 543 | 623 | |
International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 778 | 727 | |
International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 331 | 230 | 219 |
Equity Funds [Member] | United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 28 | 15 | |
Equity Funds [Member] | United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 10 | |
Equity Funds [Member] | United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 28 | 5 | |
Equity Funds [Member] | United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Equity Funds [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 406 | 378 | |
Equity Funds [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 143 | 116 | |
Equity Funds [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 218 | 261 | |
Equity Funds [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 45 | 1 | 0 |
Equity Securities [Member] | United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 17 | |
Equity Securities [Member] | United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 16 | |
Equity Securities [Member] | United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 1 | |
Equity Securities [Member] | United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Equity Securities [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 56 | 51 | |
Equity Securities [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 53 | 50 | |
Equity Securities [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 3 | 1 | |
Equity Securities [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Fixed Income Funds [Member] | United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 23 | 8 | |
Fixed Income Funds [Member] | United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | | 8 | |
Fixed Income Funds [Member] | United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 23 | 0 | |
Fixed Income Funds [Member] | United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Fixed Income Funds [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 706 | 768 | |
Fixed Income Funds [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 287 | 400 | |
Fixed Income Funds [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 354 | 335 | |
Fixed Income Funds [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 65 | 33 | 44 |
Hedge Funds [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 167 | 130 | |
Hedge Funds [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Hedge Funds [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 57 | 25 | |
Hedge Funds [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 110 | 105 | 88 |
Government Bonds [Member] | United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 4 | |
Government Bonds [Member] | United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Government Bonds [Member] | United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 4 | |
Government Bonds [Member] | United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate Bonds [Member] | United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 8 | |
Corporate Bonds [Member] | United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Corporate Bonds [Member] | United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 8 | |
Corporate Bonds [Member] | United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other Bonds [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 83 | 69 | |
Other Bonds [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other Bonds [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 41 | 36 | |
Other Bonds [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 42 | 33 | 27 |
Other Funds [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 173 | 120 | |
Other Funds [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other Funds [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 105 | 69 | |
Other Funds [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 68 | 51 | 53 |
Cash And Cash Equivalents [Member] | United States Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 15 | 18 | |
Cash And Cash Equivalents [Member] | United States Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash And Cash Equivalents [Member] | United States Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 15 | 18 | |
Cash And Cash Equivalents [Member] | United States Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash And Cash Equivalents [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 60 | 50 | |
Cash And Cash Equivalents [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 60 | 50 | |
Cash And Cash Equivalents [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Cash And Cash Equivalents [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other Contract [Member] | International Pension Benefits [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 1 | 14 | |
Other Contract [Member] | International Pension Benefits [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 7 | |
Other Contract [Member] | International Pension Benefits [Member] | Significant Other Observable Inputs (Level 2) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
Other Contract [Member] | International Pension Benefits [Member] | Significant Unobservable Inputs (Level 3) [Member] | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 1 | $ 7 | $ 7 |