Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets
Accumulated goodwill impairment losses		$ 0
Definite-lived intangible assets
Gross carrying amount		17,103	$ 5,643
Accumulated amortization		(4,967)	(4,575)
Net carrying amount		12,136	1,068
Indefinite-lived research and development		7,573	445
Net carrying amount - Indefinite-lived research and development		7,573	445
Total intangible assets gross carrying amount		24,676	6,088
Accumulated amortization - Total intangible assets		(4,967)	(4,575)
Total intangible assets, net		19,709	1,513
Amortization of intangible assets		419	403	$ 509
Anticipated annual amortization expense
2016		655
2017		740
2018		894
2019		1,000
2020		1,100
Impairment charges	$ 37	$ 0	37	$ 0
Weighted Average
Definite-lived intangible assets
Amortization period		10 years
Developed Technology Rights
Definite-lived intangible assets
Gross carrying amount		$ 9,103	4,546
Accumulated amortization		(3,944)	(3,706)
Net carrying amount		$ 5,159	840
Developed Technology Rights | Minimum
Definite-lived intangible assets
Amortization period		3 years
Developed Technology Rights | Maximum
Definite-lived intangible assets
Amortization period		16 years
Developed Technology Rights | Weighted Average
Definite-lived intangible assets
Amortization period		12 years
Licensing Agreements
Definite-lived intangible assets
Acquisition of amortizable intangible assets			80
Gross carrying amount		$ 8,000	1,097
Accumulated amortization		(1,023)	(869)
Net carrying amount		$ 6,977	$ 228
Licensing Agreements | Minimum
Definite-lived intangible assets
Amortization period		3 years
Licensing Agreements | Maximum
Definite-lived intangible assets
Amortization period		16 years
Licensing Agreements | Weighted Average
Definite-lived intangible assets
Amortization period		11 years