Borrowings and Capital Leases (Senior Notes Related to Baxalta Acquisition) (Details) - Baxalta notes	3 Months Ended
Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Aggregate amount	$ 5,000,000,000
Senior Notes
Debt Instrument [Line Items]
Carrying amount	5,041,900,000
Senior Notes \| Variable-rate notes due 2018
Debt Instrument [Line Items]
Aggregate amount	375,000,000
Carrying amount	$ 374,500,000
Senior Notes \| Variable-rate notes due 2018 \| LIBOR
Debt Instrument [Line Items]
Effective Interest Rate, Variable Rate	0.78%
Senior Notes \| Fixed-rate notes due 2018
Debt Instrument [Line Items]
Aggregate amount	$ 375,000,000
Coupon rate	2.00%
Carrying amount	$ 375,000,000
Senior Notes \| Fixed-rate notes due 2020
Debt Instrument [Line Items]
Aggregate amount	$ 1,000,000,000
Coupon rate	2.875%
Carrying amount	$ 997,000,000
Senior Notes \| Fixed-rate notes due 2022
Debt Instrument [Line Items]
Aggregate amount	$ 500,000,000
Coupon rate	3.60%
Carrying amount	$ 506,400,000
Senior Notes \| Fixed-rate notes due 2025
Debt Instrument [Line Items]
Aggregate amount	$ 1,750,000,000
Coupon rate	4.00%
Carrying amount	$ 1,758,700,000
Senior Notes \| Fixed-rate notes due 2045
Debt Instrument [Line Items]
Aggregate amount	$ 1,000,000,000
Coupon rate	5.25%
Carrying amount	$ 1,030,300,000

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

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.

+ References

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

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-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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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