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Collaborations - BeiGene (Details) - USD ($)		12 Months Ended
	Jan. 02, 2020	Dec. 31, 2020
BeiGene
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Ownership percentage	20.50%	20.50%
Equity Method Investment, Aggregate Cost	$ 2,800,000,000
BeiGene
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross	$ 1,250,000,000
BeiGene | Other current assets [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Recovery Of Direct Costs, Receivable		$ 113,000,000
BeiGene | Research and Development Expense [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost recoveries		$ 225,000,000

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