Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Goodwill and Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017	Sep. 30, 2018
Indefinite-lived intangible assets
Indefinite-lived research and development assets		$ 4,920,000,000	$ 0
Indefinite-lived intangible assets impairment charges, pre-tax				$ 0
In-Process Research and Development \| Stemcentrx Inc.
Indefinite-lived intangible assets
Indefinite-lived research and development assets		1,000,000,000.0			$ 6,100,000,000
Indefinite-lived intangible assets impairment charges, pre-tax		$ 5,100,000,000	$ 1,000,000,000.0
SKYRIZI
Indefinite-lived intangible assets
Reclassification from indefinite-lived intangible assets	$ (3,900,000,000)