Goodwill and Intangible Assets (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

Goodwill and Intangible Assets

Schedule of intangible assets

	March 31, 2013				December 31, 2012
(in millions)	Gross carrying amount	Accumulated amortization		Net carrying amount	Gross carrying amount	Accumulated amortization		Net carrying amount
Definite-lived intangible assets
Developed product rights	$4,664	$(3,146	)	$1,518	$4,699	$(3,031	)	$1,668
License agreements	971	(756	)	215	969	(734	)	235
Total definite-lived intangible assets	5,635	(3,902	)	1,733	5,668	(3,765	)	1,903
Indefinite-lived research and development	420	—		420	420	—		420
Total intangible assets	$6,055	$(3,902	)	$2,153	$6,088	$(3,765	)	$2,323

	December 31, 2012							December 31, 2011
(in millions)	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Definite-lived intangible assets
Developed product rights	$	4,699	$	(3,031	)	$	1,668	$	4,675	$	(2,492	)	$	2,183
License agreements		969		(734	)		235		949		(647	)		302
Total definite-lived intangible assets		5,668		(3,765	)		1,903		5,624		(3,139	)		2,485
Indefinite-lived research and development		420		—			420		425		—			425
Total intangible assets	$	6,088	$	(3,765	)	$	2,323	$	6,049	$	(3,139	)	$	2,910