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Financing arrangements (Details Textual) (0.375% convertible notes due 2013 (0.375% 2013 Convertible Notes) [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	0 Months Ended	1 Months Ended
	Feb. 28, 2013	May 01, 2013 Subsequent Event [Member]	Feb. 28, 2013 Value in Excess of Principal [Member]
Debt Instruments [Line Items]
Repayment of convertible notes	$ 2,500		$ 99
Cash settlement of convertible bond hedge	99
Number of shares acquired by warrants issued in connection with debt		32
Exercise price of warrants (in usd per warrant)		104.80
Net cash settlement of warrants		$ 100

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

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- Definition

The cash inflow from other equity not otherwise defined in the taxonomy.

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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