Borrowings and Capital Leases (Senior Notes Related to Baxalta Acquisition) (Details) - Baxalta notes - Senior Notes	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Aggregate amount	$ 1,924,800,000.0
Carrying amount	1,939,900,000
Fixed-rate notes due 2020
Debt Instrument [Line Items]
Aggregate amount	$ 404,500,000.0
Coupon rate	2.875%
Carrying amount	$ 403,000,000
Fixed-rate notes due 2022
Debt Instrument [Line Items]
Aggregate amount	$ 219,400,000.0
Coupon rate	3.60%
Carrying amount	$ 221,900,000
Fixed-rate notes due 2025
Debt Instrument [Line Items]
Aggregate amount	$ 800,500,000.0
Coupon rate	4.00%
Carrying amount	$ 799,700,000
Fixed-rate notes due 2045
Debt Instrument [Line Items]
Aggregate amount	$ 500,400,000.0
Coupon rate	5.25%
Carrying amount	$ 515,300,000

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.

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