Divestitures (Details 1) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended			9 Months Ended
	Jan. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Divestitures (Textuals) [Abstract]
Purchase price for divestiture of business/controlling interest	$ 1,500
Proceeds from divestitures of businesses	1,450				10	1,426
Proceeds from divestiture of business, excluding amounts placed in escrow	1,426
Amount placed into escrow	24
Contingent receivable for divestiture of business		40			40
Revenues generated by the Neurovascular business		32	34		91	111
Gain on divestiture of business				760
Gain on divestiture of business, net of tax				$ 530