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Debt (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Short-term Debt [Line Items] |  |
Outstanding Balance | $ 3,424 | $ 3,414
Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
Year-End Stated Rate on Debt | 1.43% | 1.03%
Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding Balance | 608 | 645
Commercial Paper [Member] | Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
Year-End Stated Rate on Debt | 0.03% | 0.16%
Other Short Term Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding Balance | 2,816 | 2,769
Other Short Term Borrowings [Member] | Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
Year-End Stated Rate on Debt | 1.73% | 1.23%
Bank Overdrafts [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding Balance | $ 821 | $ 966

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