Divestitures (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2011	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Divestitures and Assets Held for Sale [Abstract]
Purchase price for divestiture of business/controlling interest		$ 1,500
Proceeds from business divestitures, net of costs	12			28	12	30	10	1,450
Proceeds from divestiture of business, excluding amounts placed in escrow		1,426
Amount Placed In Escrow Included In Proceeds From Divestiture Of Business		24
Revenues generated by the Neurovascular business			$ 1	$ 19	$ 3	$ 55