Indebtedness Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Long-term debt	$ 16,756	$ 17,034
Less current portion of long-term debt	1,410	2,206
Debt excluding current portion, carrying value	15,346	14,828
US Dollar Notes [Member] \| U.S. Dollar Notes [Member]
Long-term debt	12,488	11,269
Due through	2042
Interest rate, minimum	1.625%
Interest rate, maximum	6.875%
Interest rate, average	4.81%
Foreign Currency Obligations [Member] \| Euro Notes Payable [Member]
Long-term debt	1,978	3,533
Due through	2016
Interest rate, minimum	5.75%
Interest rate, maximum	5.875%
Interest rate, average	5.813%
Foreign Currency Obligations [Member] \| Swiss Franc Notes Payable [Member]
Long-term debt	1,790	1,719
Due through	2021
Interest rate, minimum	1.00%
Interest rate, maximum	4.00%
Interest rate, average	2.799%
Foreign Currency Obligations [Member] \| Other Payable [Member]
Long-term debt	$ 500	$ 513
Due through	2024
Interest rate, average	2.93%

The average effective interest rate during the reporting period.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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