Acquisitions (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Business Acquisition [Line Items]
Benefit related to change in fair value of contingent liability			$ 41
Contingent payment related to business combination	15	1	15	4
R&D- and commercialization-based milestones [Member]
Business Acquisition [Line Items]
Business Acquisition, Contingent Consideration, at Fair Value	209		209
revenue-based payments [Member] | Monte Carlo [Member]
Business Acquisition [Line Items]
Business Acquisition, Contingent Consideration, at Fair Value	253		253
revenue-based payments [Member] | Discounted cash flow [Member]
Business Acquisition [Line Items]
Business Acquisition, Contingent Consideration, at Fair Value	$ 148		$ 148
Maximum [Member] | R&D- and commercialization-based milestones [Member]
Business Acquisition [Line Items]
Risk-adjusted discount rate for contingent consideration	1.80%		1.80%
contingent consideration liability, probability of payment	98.00%		98.00%
contingent consideration liability, projected year of payment	2017		2017
Maximum [Member] | revenue-based payments [Member] | Monte Carlo [Member]
Business Acquisition [Line Items]
contingent consideration liability, projected year of payment	2018		2018
Maximum [Member] | revenue-based payments [Member] | Discounted cash flow [Member]
Business Acquisition [Line Items]
Risk-adjusted discount rate for contingent consideration	18.00%		18.00%
contingent consideration liability, probability of payment	100.00%		100.00%
contingent consideration liability, projected year of payment	2018		2018
Low end of range [Member] | revenue-based payments [Member] | Monte Carlo [Member]
Business Acquisition [Line Items]
Revenue Volatility - Contingent Consideration			13.00%
High end of range [Member] | revenue-based payments [Member] | Monte Carlo [Member]
Business Acquisition [Line Items]
Revenue Volatility - Contingent Consideration			28.00%
Minimum [Member] | R&D- and commercialization-based milestones [Member]
Business Acquisition [Line Items]
Risk-adjusted discount rate for contingent consideration	0.90%		0.90%
contingent consideration liability, probability of payment	70.00%		70.00%
contingent consideration liability, projected year of payment	2013		2013
Minimum [Member] | revenue-based payments [Member] | Monte Carlo [Member]
Business Acquisition [Line Items]
contingent consideration liability, projected year of payment	2013		2013
Minimum [Member] | revenue-based payments [Member] | Discounted cash flow [Member]
Business Acquisition [Line Items]
Risk-adjusted discount rate for contingent consideration	12.00%		12.00%
contingent consideration liability, probability of payment	15.00%		15.00%
contingent consideration liability, projected year of payment	2013		2013