Goodwill and Intangible Assets Acquisitions (Details) (USD $)	Dec. 31, 2012
Business Combinations [Abstract]
Value of assets by Milestone	$ 1,400,000,000
Business Acquisition, Cost of Acquired Entity, Purchase Price	37,000,000
Business Acquisition, Cost of Acquired Entity, Cash Paid	24,000,000
Business Acquisition, Contingent Consideration, at Fair Value	13,000,000
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill	21,000,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount	$ 26,000,000