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Fair Value Measurements (Schedule Of Fair Value Of Short-Term And Long-Term Debt, Excluding Capital Leases) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2012
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Dec. 31, 2011
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|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Short- and long-term debt | $ 51,597 | $ 55,152 |
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Carrying Amount, Fair Value Disclosure [Member] | Excluding Capital Leases [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Short- and long-term debt | 51,275 | 54,800 |
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Fair Value, Fair Value Disclosure [Member] | Excluding Capital Leases [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Short- and long-term debt | $ 60,164 | $ 64,485 |