Borrowings and Capital Leases (Senior Notes Related to Baxalta Acquisition) (Details) - Baxalta notes - Senior Notes	Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
Aggregate amount	$ 4,250,000,000
Carrying amount	4,287,300,000
Fixed-rate notes due 2020
Debt Instrument [Line Items]
Aggregate amount	$ 1,000,000,000
Coupon rate	2.875%
Carrying amount	$ 996,400,000
Fixed-rate notes due 2022
Debt Instrument [Line Items]
Aggregate amount	$ 500,000,000
Coupon rate	3.60%
Carrying amount	$ 506,100,000
Fixed-rate notes due 2025
Debt Instrument [Line Items]
Aggregate amount	$ 1,750,000,000
Coupon rate	4.00%
Carrying amount	$ 1,754,700,000
Fixed-rate notes due 2045
Debt Instrument [Line Items]
Aggregate amount	$ 1,000,000,000
Coupon rate	5.25%
Carrying amount	$ 1,030,100,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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 FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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=64930739&loc=d3e28878-108400

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-Name Accounting Standards Codification
-Topic 835
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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