Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Goodwill
Balance at the beginning of the period			$ 6,130
Additions			25
Currency translation and other adjustments			44
Balance at the end of the period	6,199		6,199
Accumulated goodwill impairment losses	0		0
Definite-lived intangible assets
Gross carrying amount	5,734		5,734		5,668
Accumulated amortization	(4,187)		(4,187)		(3,765)
Net carrying amount	1,547		1,547		1,903
Indefinite-lived research and development	446		446		420
Net carrying amount - Indefinite-lived research and development	446		446		420
Total intangible assets gross carrying amount	6,180		6,180		6,088
Accumulated amortization - Total intangible assets	(4,187)		(4,187)		(3,765)
Total intangible assets	1,993		1,993		2,323
Amortization of intangible assets	137	134	408	489
Impairment charges			0	0
Weighted average
Definite-lived intangible assets
Useful life			5 years
Developed product rights
Definite-lived intangible assets
Gross carrying amount	4,737		4,737		4,699
Accumulated amortization	(3,416)		(3,416)		(3,031)
Net carrying amount	1,321		1,321		1,668
License agreements
Definite-lived intangible assets
Gross carrying amount	997		997		969
Accumulated amortization	(771)		(771)		(734)
Net carrying amount	$ 226		$ 226		$ 235