Business Combinations (Baxalta Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jun. 03, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Goodwill		$ 19,149.1	$ 17,888.2	$ 6,881.9	$ 4,147.8
Baxalta
Current assets:
Cash and cash equivalents		583.2
Accounts receivable		974.7
Inventories		3,991.2
Other current assets		576.0
Total current assets		6,125.1
Property, plant and equipment		5,414.7
Investments		128.2
Goodwill	$ 12,636.2	12,636.2
Other non-current assets		217.4
Total assets		45,603.8
Current liabilities:
Accounts payable and accrued expenses		1,306.4
Other current liabilities		361.9
Long-term borrowings		5,424.9
Deferred tax liability		5,013.3
Other non-current liabilities		1,103.6
Total liabilities		13,210.1
Preliminary fair value of identifiable assets acquired and liabilities assumed		32,393.7
Preliminary fair value of purchase consideration	32,393.7	32,393.7
Currently marketed products | Baxalta
Current assets:
Intangible assets	20,890.0	20,890.0
In-Process Research and Development (IPR&D) | Baxalta
Current assets:
Intangible assets	$ 150.0	150.0
Contract based arrangements | Baxalta
Current assets:
Intangible assets		42.2
Preliminary values | Baxalta
Current assets:
Cash and cash equivalents			583.2
Accounts receivable			1,069.7
Inventories			3,893.4
Other current assets			576.0
Total current assets			6,122.3
Property, plant and equipment			5,452.7
Investments			128.2
Goodwill			11,422.4
Other non-current assets			155.0
Total assets			46,047.8
Current liabilities:
Accounts payable and accrued expenses			1,321.9
Other current liabilities			354.4
Long-term borrowings			5,424.9
Deferred tax liability			5,445.3
Other non-current liabilities			1,103.6
Total liabilities			13,650.1
Preliminary fair value of identifiable assets acquired and liabilities assumed			32,397.7
Preliminary fair value of purchase consideration			32,397.7
Preliminary values | Currently marketed products | Baxalta
Current assets:
Intangible assets			21,995.0
Preliminary values | In-Process Research and Development (IPR&D) | Baxalta
Current assets:
Intangible assets			730.0
Preliminary values | Contract based arrangements | Baxalta
Current assets:
Intangible assets			$ 42.2
Measurement period adjustments | Baxalta
Current assets:
Cash and cash equivalents		0.0
Accounts receivable		(95.0)
Inventories		97.8
Other current assets		0.0
Total current assets		2.8
Property, plant and equipment		(38.0)
Investments		0.0
Goodwill		1,213.8
Other non-current assets		62.4
Total assets		(444.0)
Current liabilities:
Accounts payable and accrued expenses		(15.5)
Other current liabilities		7.5
Long-term borrowings		0.0
Deferred tax liability		(432.0)
Other non-current liabilities		0.0
Total liabilities		(440.0)
Preliminary fair value of identifiable assets acquired and liabilities assumed		(4.0)
Preliminary fair value of purchase consideration		(4.0)
Measurement period adjustments | Currently marketed products | Baxalta
Current assets:
Intangible assets		(1,105.0)
Measurement period adjustments | In-Process Research and Development (IPR&D) | Baxalta
Current assets:
Intangible assets		(580.0)
Measurement period adjustments | Contract based arrangements | Baxalta
Current assets:
Intangible assets		$ 0.0