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Income Taxes (Schedule Of Components Of Net Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Income Taxes [Abstract] |  |
Deferred tax assets, Depreciation | $ 74 | $ 204
Deferred tax assets, Employee benefits | 2,668 | 2,383
Deferred tax assets, Loss provisions | 325 | 391
Deferred tax assets, Deferred income/expense | 45 | 104
Deferred tax assets, Tax loss carryforwards | 2,035 | 1,953
Deferred tax assets, Tax credit carryforwards | 477 | 503
Deferred tax assets, Derivatives and hedging activities | 109 | 162
Deferred tax assets, Other | 315 | 633
Deferred tax assets, Gross | 6,048 | 6,333
Deferred tax assets, Valuation allowance | (1,398) | (1,268)
Deferred tax assets, net | 4,650 | 5,065
Deferred tax liabilities, Depreciation | 933 | 1,330
Deferred tax liabilities, Employee benefits | 51 | 45
Deferred tax liabilities, Loss provisions | 9 | 40
Deferred tax liabilities, Deferred income/expense | 181 | 159
Deferred tax liabilities, Tax loss carryforwards |  |
Deferred tax liabilities, Tax credit carryforwards |  |
Deferred tax liabilities, Derivatives and hedging activities | 43 | 12
Deferred tax liabilities, Other | 288 | 547
Deferred tax liabilities, Gross | 1,505 | 2,133
Deferred tax liabilities, Net | $ 1,505 | $ 2,133

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