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Income Taxes (Schedule Of Expiration Periods Of The Deferred Tax Assets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Tax Credit Carryforward [Line Items] |  |  |
Tax loss carryforwards | $ 2,035 |  |
Tax credit carryforwards | 477 |  |
Other | 3,536 |  |
Valuation allowance | (1,398) |  |
Deferred tax assets, net | 4,650 |  | 5,065
Expires Within 10 Years [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax loss carryforwards | 340 |  |
Tax credit carryforwards | 360 |  |
Valuation allowance | (231) |  |
Deferred tax assets, net | 469 |  |
Expires Within 11 To 20 Years [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax loss carryforwards | 815 |  |
Tax credit carryforwards | 58 |  |
Valuation allowance | (643) |  |
Deferred tax assets, net | 230 |  |
No Expiration [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax loss carryforwards | 880 | [1] |
Tax credit carryforwards | 59 | [1] |
Other | 507 | [1] |
Valuation allowance | (213) | [1] |
Deferred tax assets, net | 1,233 | [1] |
Other Deferred Tax Assets [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Other | 3,029 | [1] |
Valuation allowance | (311) | [1] |
Deferred tax assets, net | $ 2,718 | [1] |
[1] | * Deferred tax assets with no expiration may still have annual limitations on utilization. Other represents deferred tax assets whose expiration is dependent upon the reversal of the underlying temporary difference. A substantial amount of Other relates to employee benefits that will become deductible for tax purposes over an extended period of time as contributions are made to employee benefit plans and payments are made to retirees.

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- Definition The aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; net of deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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