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Business Combinations and Asset Acquisitions (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Apr. 16, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 1,639	$ 0
Acquired in-process research and development		$ 0	$ 0	$ 1,505	$ 0
Five Prime Therapeutics, Inc.
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,600
Acquired in-process research and development	1,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	47
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	$ 177

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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The amount of the write-off for research and development assets that were acquired in a transaction other than a business combination.

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