Acquisitions (Details) (USD $)	3 Months Ended	9 Months Ended				9 Months Ended			9 Months Ended			9 Months Ended		0 Months Ended	9 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 R&D- and commercialization-based milestones [Member]	Sep. 30, 2014 R&D- and commercialization-based milestones [Member] Minimum [Member]	Sep. 30, 2014 R&D- and commercialization-based milestones [Member] Maximum [Member]	Sep. 30, 2014 revenue-based payments [Member] Discounted cash flow [Member]	Sep. 30, 2014 revenue-based payments [Member] Discounted cash flow [Member] Minimum [Member]	Sep. 30, 2014 revenue-based payments [Member] Discounted cash flow [Member] Maximum [Member]	Sep. 30, 2014 revenue-based payments [Member] Monte Carlo [Member]	Sep. 30, 2014 revenue-based payments [Member] Monte Carlo [Member] Minimum [Member]	Sep. 30, 2014 revenue-based payments [Member] Monte Carlo [Member] Maximum [Member]	Sep. 02, 2014 Bayer [Member]	Sep. 30, 2014 Bayer and IoGyn [Member]	Sep. 30, 2014 IoGyn [Member]	May 07, 2014 IoGyn [Member]	Sep. 30, 2014 IoGyn [Member]	May 07, 2014 IoGyn [Member]	Sep. 30, 2014 Technology-Based Intangible Assets [Member]	Sep. 30, 2014 Customer Relationships [Member]	Sep. 30, 2014 Customer Relationships [Member] Minimum [Member]	Sep. 30, 2014 Customer Relationships [Member] Maximum [Member]	Sep. 30, 2014 Other Intangible Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets																$ 23,000,000
Finite-lived Intangible Assets Acquired																				233,000,000	29,000,000			1,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life																					10 years	10 years	14 years	2 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation																					18.00%	14.00%	18.00%	14.00%
Goodwill		5,901,000,000		5,693,000,000												210,000,000
Accrued Contingent Consideration		363,000,000		(501,000,000)
Business Combination, Liabilities Arising from Contingencies, Amount Recognized		(3,000,000)
Adjustments to accrued contingent consideration		(4,000,000)
Contingent consideration expense (benefit)		122,000,000
Contingent payment related to business combination		15,000,000	(115,000,000)
Maximum future contingent consideration for acquisitions		2,100,000,000
Business Combination, Contingent Consideration, Liability					(62,000,000)			(48,000,000)			(253,000,000)
Revenue Volatility - Contingent Consideration												11.00%	13.00%
contingent consideration liability, projected year of payment						2014	2015		2014	2018		2014	2018
contingent consideration liability, probability of payment						60.00%	95.00%		0.00%	100.00%
Risk-adjusted discount rate for contingent consideration						0.90%	1.40%		11.50%	15.00%
Minority interest owned of IoGyn																			28.00%
Accounts and Notes Receivable, Net																	8,000,000
Payments to Acquire Businesses, Net of Cash Acquired		487,000,000	0											414,000,000	479,000,000		65,000,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		31,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain																		19,000,000
Remaining equity of IoGyn purchased																72.00%		72.00%
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination		510,000,000														510,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		263,000,000														263,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other																17,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets																5,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net																(1,000,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Current																(7,000,000)
Payment of contingent consideration	$ (100,000,000)	$ 15,000,000	$ 107,000,000