Guarantor Financial Information (Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Product sales									$ 10,885.8	$ 6,099.9	$ 5,830.4
Royalties and other revenues									510.8	316.8	191.7
Total revenues	$ 3,806.1	$ 3,452.1	$ 2,429.1	$ 1,709.3	$ 1,715.7	$ 1,655.0	$ 1,557.6	$ 1,488.4	11,396.6	6,416.7	6,022.1
Cost of sales	1,053.6	1,736.2	778.1	248.6	250.5	262.7	228.0	227.8	3,816.5	969.0	979.3
Research and development									1,439.8	1,564.0	1,067.5
Selling, general and administrative									3,015.2	1,842.5	1,782.0
Amortization of acquired intangible assets									1,173.4	498.7	243.8
Integration and acquisition costs									883.9	39.8	158.8
Reorganization costs									121.4	97.9	180.9
Gain on sale of product rights									(16.5)	(14.7)	(88.2)
Total operating expenses, net									10,433.7	4,997.2	4,324.1
Operating income from continuing operations									962.9	1,419.5	1,698.0
Interest (expense) / income, net									(451.2)	(37.4)	(6.1)
Other (expense)/income, net									(25.6)	3.7	8.9
Receipt of break fee									0.0	0.0	1,635.4
Total other (expense)/income, net									(476.8)	(33.7)	1,638.2
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									486.1	1,385.8	3,336.2
Income taxes									126.1	(46.1)	(56.1)
Equity in (losses)/ earnings of equity method investees, net of taxes									(8.7)	(2.2)	2.7
Income from continuing operations, net of taxes	475.9	(368.5)	86.6	409.5	283.4	477.1	164.1	412.9	603.5	1,337.5	3,282.8
(Loss)/gain from discontinued operations, net of taxes	(18.6)	(18.3)	(248.7)	9.5	(2.8)	(24.3)	(4.5)	(2.5)	(276.1)	(34.1)	122.7
Net income / (loss)	$ 457.3	$ (386.8)	$ (162.1)	$ 419.0	$ 280.6	$ 452.8	$ 159.6	$ 410.4	327.4	1,303.4	3,405.5
Comprehensive income / (loss)									(986.4)	1,151.1	3,263.8
Eliminations
Condensed Income Statements, Captions [Line Items]
Product sales									0.0	0.0	0.0
Royalties and other revenues									0.0	0.0	0.0
Total revenues									0.0	0.0	0.0
Cost of sales									0.0	0.0	0.0
Research and development									0.0	0.0	0.0
Selling, general and administrative									0.0	1.4	1.4
Amortization of acquired intangible assets									0.0	0.0	0.0
Integration and acquisition costs									0.0	0.0	0.0
Reorganization costs									0.0	0.0	0.0
Gain on sale of product rights									0.0	0.0	0.0
Total operating expenses, net									0.0	1.4	1.4
Operating income from continuing operations									0.0	(1.4)	(1.4)
Interest (expense) / income, net									0.0	0.0	0.0
Other (expense)/income, net									0.0	0.0	0.0
Receipt of break fee											0.0
Total other (expense)/income, net									0.0	0.0	0.0
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									0.0	(1.4)	(1.4)
Income taxes									0.0	0.0	0.0
Equity in (losses)/ earnings of equity method investees, net of taxes									174.9	(1,388.1)	(1,919.8)
Income from continuing operations, net of taxes									174.9	(1,389.5)	(1,921.2)
(Loss)/gain from discontinued operations, net of taxes									0.0	0.0	0.0
Net income / (loss)									174.9	(1,389.5)	(1,921.2)
Comprehensive income / (loss)									2,694.4	(1,237.2)	(1,779.5)
Parent Company
Condensed Income Statements, Captions [Line Items]
Product sales									0.0	0.0	0.0
Royalties and other revenues									0.0	0.0	0.0
Total revenues									0.0	0.0	0.0
Cost of sales									0.0	0.0	0.0
Research and development									0.0	0.0	0.0
Selling, general and administrative									59.8	24.9	109.4
Amortization of acquired intangible assets									0.0	0.0	0.0
Integration and acquisition costs									0.0	0.0	0.0
Reorganization costs									0.0	0.0	0.0
Gain on sale of product rights									0.0	0.0	0.0
Total operating expenses, net									59.8	24.9	109.4
Operating income from continuing operations									(59.8)	(24.9)	(109.4)
Interest (expense) / income, net									(100.6)	(63.6)	(42.8)
Other (expense)/income, net									0.9	0.9	0.3
Receipt of break fee											1,635.4
Total other (expense)/income, net									(99.7)	(62.7)	1,592.9
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									(159.5)	(87.6)	1,483.5
Income taxes									4.3	2.9	2.2
Equity in (losses)/ earnings of equity method investees, net of taxes									482.6	1,388.1	1,919.8
Income from continuing operations, net of taxes									327.4	1,303.4	3,405.5
(Loss)/gain from discontinued operations, net of taxes									0.0	0.0	0.0
Net income / (loss)									327.4	1,303.4	3,405.5
Comprehensive income / (loss)									(986.4)	1,151.1	3,263.8
SAIIDAC (SAIIDAC Notes Subsidiary Issuer)
Condensed Income Statements, Captions [Line Items]
Product sales									0.0	0.0	0.0
Royalties and other revenues									0.0	0.0	0.0
Total revenues									0.0	0.0	0.0
Cost of sales									0.0	0.0	0.0
Research and development									0.0	0.0	0.0
Selling, general and administrative									0.0	0.0	0.0
Amortization of acquired intangible assets									0.0	0.0	0.0
Integration and acquisition costs									0.0	0.0	0.0
Reorganization costs									0.0	0.0	0.0
Gain on sale of product rights									0.0	0.0	0.0
Total operating expenses, net									0.0	0.0	0.0
Operating income from continuing operations									0.0	0.0	0.0
Interest (expense) / income, net									36.5	(1.7)	0.0
Other (expense)/income, net									0.0	0.0	0.0
Receipt of break fee											0.0
Total other (expense)/income, net									36.5	(1.7)	0.0
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									36.5	(1.7)	0.0
Income taxes									(9.1)	0.0	0.0
Equity in (losses)/ earnings of equity method investees, net of taxes									0.0	0.0	0.0
Income from continuing operations, net of taxes									27.4	(1.7)	0.0
(Loss)/gain from discontinued operations, net of taxes									0.0	0.0	0.0
Net income / (loss)									27.4	(1.7)	0.0
Comprehensive income / (loss)									27.4	(1.7)	0.0
Baxalta Inc. (Baxalta Notes Subsidiary Issuer and SAIIDAC Notes Subsidiary Guarantor)
Condensed Income Statements, Captions [Line Items]
Product sales									0.0	0.0	0.0
Royalties and other revenues									0.0	0.0	0.0
Total revenues									0.0	0.0	0.0
Cost of sales									0.0	0.0	0.0
Research and development									0.4	0.0	0.0
Selling, general and administrative									29.4	0.0	0.0
Amortization of acquired intangible assets									0.0	0.0	0.0
Integration and acquisition costs									302.0	0.0	0.0
Reorganization costs									0.0	0.0	0.0
Gain on sale of product rights									0.0	0.0	0.0
Total operating expenses, net									331.8	0.0	0.0
Operating income from continuing operations									(331.8)	0.0	0.0
Interest (expense) / income, net									(45.1)	0.0	0.0
Other (expense)/income, net									2.7	0.0	0.0
Receipt of break fee											0.0
Total other (expense)/income, net									(42.4)	0.0	0.0
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									(374.2)	0.0	0.0
Income taxes									88.9	0.0	0.0
Equity in (losses)/ earnings of equity method investees, net of taxes									(657.5)	0.0	0.0
Income from continuing operations, net of taxes									(942.8)	0.0	0.0
(Loss)/gain from discontinued operations, net of taxes									0.0	0.0	0.0
Net income / (loss)									(942.8)	0.0	0.0
Comprehensive income / (loss)									(2,148.9)	0.0	0.0
Non-Guarantor Non-Issuer Subsidiaries
Condensed Income Statements, Captions [Line Items]
Product sales									10,885.8	6,099.9	5,830.4
Royalties and other revenues									510.8	316.8	191.7
Total revenues									11,396.6	6,416.7	6,022.1
Cost of sales									3,816.5	969.0	979.3
Research and development									1,439.4	1,564.0	1,067.5
Selling, general and administrative									2,926.0	1,816.2	1,671.2
Amortization of acquired intangible assets									1,173.4	498.7	243.8
Integration and acquisition costs									581.9	39.8	158.8
Reorganization costs									121.4	97.9	180.9
Gain on sale of product rights									(16.5)	(14.7)	(88.2)
Total operating expenses, net									10,042.1	4,970.9	4,213.3
Operating income from continuing operations									1,354.5	1,445.8	1,808.8
Interest (expense) / income, net									(342.0)	27.9	36.7
Other (expense)/income, net									(29.2)	2.8	8.6
Receipt of break fee											0.0
Total other (expense)/income, net									(371.2)	30.7	45.3
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									983.3	1,476.5	1,854.1
Income taxes									42.0	(49.0)	(58.3)
Equity in (losses)/ earnings of equity method investees, net of taxes									(8.7)	(2.2)	2.7
Income from continuing operations, net of taxes									1,016.6	1,425.3	1,798.5
(Loss)/gain from discontinued operations, net of taxes									(276.1)	(34.1)	122.7
Net income / (loss)									740.5	1,391.2	1,921.2
Comprehensive income / (loss)									(572.9)	1,238.9	1,779.5
Non-Guarantor Subsidiaries of Baxalta Notes
Condensed Income Statements, Captions [Line Items]
Product sales									10,885.8	6,099.9	5,830.4
Royalties and other revenues									510.8	316.8	191.7
Total revenues									11,396.6	6,416.7	6,022.1
Cost of sales									3,816.5	969.0	979.3
Research and development									1,439.4	1,564.0	1,067.5
Selling, general and administrative									2,926.0	1,816.2	1,671.2
Amortization of acquired intangible assets									1,173.4	498.7	243.8
Integration and acquisition costs									581.9	39.8	158.8
Reorganization costs									121.4	97.9	180.9
Gain on sale of product rights									(16.5)	(14.7)	(88.2)
Total operating expenses, net									10,042.1	4,970.9	4,213.3
Operating income from continuing operations									1,354.5	1,445.8	1,808.8
Interest (expense) / income, net									(305.5)	26.2	36.7
Other (expense)/income, net									(29.2)	2.8	8.6
Receipt of break fee											0.0
Total other (expense)/income, net									(334.7)	29.0	45.3
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees (in millions)									1,019.8	1,474.8	1,854.1
Income taxes									32.9	(49.0)	(58.3)
Equity in (losses)/ earnings of equity method investees, net of taxes									(8.7)	(2.2)	2.7
Income from continuing operations, net of taxes									1,044.0	1,423.6	1,798.5
(Loss)/gain from discontinued operations, net of taxes									(276.1)	(34.1)	122.7
Net income / (loss)									767.9	1,389.5	1,921.2
Comprehensive income / (loss)									$ (545.5)	$ 1,237.2	$ 1,779.5