Acquisitions (Details) £ / shares in Units, $ in Millions, £ in Billions, kr in Billions						3 Months Ended
	Sep. 15, 2021 USD ($)	Sep. 15, 2021 DKK (kr)	Sep. 15, 2021 GBP (£)	Aug. 09, 2021 USD ($)	May 06, 2021 USD ($)	Dec. 31, 2021 USD ($)	Sep. 15, 2021 £ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 6,680		$ 5,964	$ 5,858
OtiTopic Inc Asset Acquisition
Business Acquisition [Line Items]
Asset acquisition, percentage of shares acquired				100.00%
Asset acquisition, consideration transferred				$ 38
Asset acquisition, contingent payment				13
Asset acquisition, future additional contingent payments				25
Pre-tax charge associated with asset acquisition				$ 51
Preliminary purchase price allocation associated with business combinations
Business Acquisition [Line Items]
Interest acquired (as a percent)					100.00%
Cash payment for business, net of cash acquired					$ 28
Contingent consideration					$ 10
Contingent payment target period					2 years
Fertin Pharma
Business Acquisition [Line Items]
Interest acquired (as a percent)	100.00%
Net purchase price	$ 821	kr 5.2
Cash payment for business combination	821
Cash	24
Current assets	69
Noncurrent assets	228
Goodwill	378
Other intangible assets	245
Current liabilities	44
Increase (decrease) in goodwill						41
Increase (decrease) in other intangible assets						(82)
Decrease in deferred tax liabilities						21
Increase in property plant and equipment						19
Noncurrent liabilities	79
Fertin Pharma | Cash Consideration
Business Acquisition [Line Items]
Net purchase price	580
Fertin Pharma | Consideration For Payment To Settle Indebtedness
Business Acquisition [Line Items]
Net purchase price	$ 241
Fertin Pharma | Minimum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful life	8 years	8 years	8 years
Fertin Pharma | Maximum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful life	19 years	19 years	19 years
Vectura
Business Acquisition [Line Items]
Interest acquired (as a percent)	74.77%
Net purchase price	$ 1,384		£ 1.0
Cash	136
Current assets	89
Noncurrent assets	67
Goodwill	590
Other intangible assets	719
Current liabilities	100
Increase (decrease) in goodwill						(115)
Increase (decrease) in other intangible assets						73
Decrease in deferred tax liabilities						$ 22
Business acquisition, share price (in dollars per share) | £ / shares							£ 165
Ownership percentage						100.00%
Noncurrent liabilities	$ 117
Vectura | Minimum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful life	3 years	3 years	3 years
Vectura | Maximum
Business Acquisition [Line Items]
Acquired intangible assets, estimated useful life	15 years	15 years	15 years