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Share Based Compensation Arrangement By Share Based Payment Award Additional Holding Period Upon Vesting

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Forfeiture Rate

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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- Definition

Net number of non-option equity instruments granted to participants.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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- Definition

Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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Share-based Compensation Plans (Narrative) (Details) $ in Millions		12 Months Ended
	Jun. 03, 2016 shares	Dec. 31, 2017 USD ($) £ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) £ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) £ / shares	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $			$ 174.9		$ 318.5		$ 100.3
Unrecognized compensation cost relating to non-vested awards \| $		$ 218.3	$ 218.3	$ 244.2	244.2	$ 115.3	115.3
Unrecognized compensation cost relating to non-vested awards, expected period for recognition			3 years
Intrinsic values of share-based awards exercised \| $		$ 147.1	$ 147.1	$ 214.6	214.6	$ 198.8	198.8
Proceeds from issuance of stock for share-based compensation arrangements \| $			134.1		169.2		16.6
Tax benefit associated with exercise of stock options \| $			$ 0.0		$ 8.8		31.6
Forfeiture rate			0.00%
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			7 years
RSUs, PSUs and PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional holding period after vesting			2 years
Vesting period			3 years
Outstanding (in shares)		3,959,720	3,959,720
Granted (in shares)			2,520,239
Outstanding (in shares)		3,959,720	3,959,720	3,976,657	3,976,657
Stock-settled SARs and stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			9,865,956
Outstanding (in shares)		25,618,821	25,618,821	21,869,833	21,869,833
Exercisable (in shares)		13,329,159	13,329,159
Weighted average grant date fair value (in GBP per share) \| £ / shares		$ 9.72		$ 8.25		$ 10.36
Baxalta \| Baxalta Replacement Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $			$ 61.6		$ 223.1		0.0
Integration related costs \| $			$ 14.8		$ 171.0		$ 0.0
Baxalta \| Baxalta Replacement Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Expiration period			10 years
Outstanding (in shares)		9,425,001	9,425,001
Baxalta \| Baxalta Replacement RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Expiration period			3 years
Outstanding (in shares)		701,340	701,340
Portfolio Share Plan Part \| SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Expiration period			7 years
Outstanding (in shares)		15,693,527	15,693,527
Sharesave Scheme \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			6 months
Outstanding (in shares)		184,647	184,647
Employee Stock Purchase Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of common stock, percent			85.00%
Savings period			12 months
Outstanding (in shares)		315,646	315,646
United Kingdom \| Sharesave Scheme \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of common stock, percent			80.00%
Ireland \| Sharesave Scheme \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of common stock, percent			75.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate			0.00%		5.00%		5.00%
Minimum \| Sharesave Scheme \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Minimum \| Employee Stock Purchase Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate			0.00%		7.00%		7.00%
Maximum \| Sharesave Scheme \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Maximum \| Employee Stock Purchase Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Executive Directors \| Portfolio Share Plan Part \| SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Baxter Employees \| RSUs, PSUs and PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	500,000
Outstanding (in shares)		0	0
Baxter Employees \| Stock-settled SARs and stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	8,800,000
Outstanding (in shares)		6,200,000	6,200,000
Exercisable (in shares)		6,200,000	6,200,000
EBT \| Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock held (in shares)		500,000	500,000
EBT \| ADS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock held (in shares)		200,000	200,000
Year 1 \| Baxalta \| Baxalta Replacement Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			33.33%
Year 1 \| Baxalta \| Baxalta Replacement RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			33.33%
Year 2 \| Baxalta \| Baxalta Replacement Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			33.33%
Year 2 \| Baxalta \| Baxalta Replacement RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			33.33%
Year 3 \| Baxalta \| Baxalta Replacement Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			33.33%
Year 3 \| Baxalta \| Baxalta Replacement RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentages			33.33%