Borrowings (Senior Notes Related to Baxalta Acquisition) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount	$ 5,000.0
Debt Instrument Carrying Amount	24,370.9	$ 1,581.4
Baxalta \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount	5,114.0
Baxalta \| Senior Notes [Member] \| Variable-rate notes due 2018 [Member]
Debt Instrument [Line Items]
Principal amount	$ 375.0
Effective Interest Rate	1.43%
Debt Instrument Carrying Amount	$ 370.3
Variable coupon rate, description	LIBOR plus 0.78%
Baxalta \| Senior Notes [Member] \| Variable-rate notes due 2018 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Coupon Rate	0.78%
Baxalta \| Senior Notes [Member] \| Fixed-rate notes due 2018 [Member]
Debt Instrument [Line Items]
Principal amount	$ 375.0
Coupon Rate	2.00%
Effective Interest Rate	2.20%
Debt Instrument Carrying Amount	$ 374.7
Baxalta \| Senior Notes [Member] \| Fixed-rate notes due 2020 [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,000.0
Coupon Rate	2.88%
Effective Interest Rate	3.00%
Debt Instrument Carrying Amount	$ 1,020.0
Baxalta \| Senior Notes [Member] \| Fixed-rate notes due 2022 [Member]
Debt Instrument [Line Items]
Principal amount	$ 500.0
Coupon Rate	3.60%
Effective Interest Rate	3.70%
Debt Instrument Carrying Amount	$ 509.1
Baxalta \| Senior Notes [Member] \| Fixed-rate notes due 2025 [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,750.0
Coupon Rate	4.00%
Effective Interest Rate	4.20%
Debt Instrument Carrying Amount	$ 1,807.6
Baxalta \| Senior Notes [Member] \| Fixed-rate notes due 2045 [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,000.0
Coupon Rate	5.25%
Effective Interest Rate	5.60%
Debt Instrument Carrying Amount	$ 1,032.3

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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