Divestitures (Details 1) (USD $)	1 Months Ended	3 Months Ended			6 Months Ended
	Jan. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011
Divestitures (Textuals) [Abstract]
Purchase price for divestiture of business/controlling interest	$ 1,500,000,000
Proceeds from divestitures of businesses	1,450,000,000					1,417,000,000
Proceeds from divestiture of business, excluding amounts placed in escrow	1,426,000,000
Amount placed into escrow	24,000,000
Contingent receivable for divestiture of business		50,000,000			50,000,000
Revenues generated by the Neurovascular business		30,000,000	43,000,000		59,000,000	77,000,000
Gain on divestiture of business				760,000,000
Gain on divestiture of business, net of tax				$ 530,000,000