Acquisitions (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Dec. 23, 2011
Acquisitions [Abstract]
Total purchase consideration	$ 348
Purchase consideration paid	22
Assumed liabilities in acquired entity	4
Business acquisition, contingent consideration	322
IPR & D identified in acquisition	338
Fixed assets acquired in acquisition	8
Goodwill	$ 2
Rate used to discount net cash inflows to present values	12.50%