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Available-for-sale Debt Securities and Equity Securities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-Sale [Abstract]
Allowance for credit losses	$ 0
Equity investments and equity method investments without readily determinable fair values	423	$ 338
Unrealized loss on investment of equity securities	657	610	$ 1,700
Equity Securities Donation | Gilead Foundation
Related Party Transaction [Line Items]
Donation expense	$ 85	$ 212

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- Definition

Equity Securities And Equity Method Investment Without Readily Determinable Fair Value, Amount

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
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-Section 50
-Paragraph 4
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