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Acquisitions of businesses (Tables)
 12 Months Ended
Dec. 31, 2019
Business Combinations1 [Abstract]  
Disclosure of fair value of assets and liabilities arising from acquisitions
($ millions)
2019

 
2018

 
2017

Property, plant & equipment
1

 
1

 
—

Currently marketed products
—

 
346

 
—

Acquired research & development
505

 
—

 
178

Deferred tax assets
28

 
12

 
8

Inventories
—

 
3

 
—

Trade receivables and other current assets
—

 
2

 
—

Cash and cash equivalents
6

 
5

 
1

Deferred tax liabilities
(121
)
 
(78
)
 
(64
)
Trade payables and other liabilities
(1
)
 
(4
)
 
—

Net identifiable assets acquired
418

 
287

 
123

Acquired liquidity
(6
)
 
(5
)
 
(1
)
Goodwill
6

 
4

 
2

Net assets recognized as a result of business combinations
418

 
286

 
124