Balance Sheet Components - Cash Equivalents and Marketable Securities (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Cash equivalents
Cash equivalents, cost or amortized cost	$ 3,664,000,000	$ 2,656,000,000	$ 2,344,000,000
Short-term marketable securities
Short-term marketable securities, estimated fair value	1,300,000,000	1,422,000,000
Long-term marketable securities
Long-term marketable securities, estimated fair value	795,000,000	583,000,000
Total	4,552,000,000	3,388,000,000
Total, unrealized gains	9,000,000	4,000,000
Total, unrealized losses	0	(3,000,000)
Total, estimated fair value	4,561,000,000	3,389,000,000
Allowance for credit losses	0	0
Money market funds
Cash equivalents
Cash equivalents, cost or amortized cost	2,433,000,000	1,349,000,000
Cash equivalents, unrealized gain	0	0
Cash equivalents paper, unrealized loss	0	0
Cash equivalents, estimated fair value	2,433,000,000	1,349,000,000
U.S. Treasury securities
Cash equivalents
Cash equivalents, cost or amortized cost	7,000,000	35,000,000
Cash equivalents, unrealized gain	0	0
Cash equivalents paper, unrealized loss	0	0
Cash equivalents, estimated fair value	7,000,000	35,000,000
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	605,000,000	717,000,000
Short-term marketable securities, unrealized gains	1,000,000	1,000,000
Short-term marketable securities, unrealized losses	0	(1,000,000)
Short-term marketable securities, estimated fair value	606,000,000	717,000,000
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	257,000,000	144,000,000
Long-term marketable securities, unrealized gains	2,000,000	1,000,000
Long-term marketable securities, unrealized losses	0	0
Long-term marketable securities, estimated fair value	259,000,000	145,000,000
Certificates of deposit
Cash equivalents
Cash equivalents, cost or amortized cost	2,000,000
Cash equivalents, unrealized gain	0
Cash equivalents paper, unrealized loss	0
Cash equivalents, estimated fair value	2,000,000
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	40,000,000	38,000,000
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	0	0
Short-term marketable securities, estimated fair value	40,000,000	38,000,000
Commercial paper
Cash equivalents
Cash equivalents, cost or amortized cost	24,000,000
Cash equivalents, unrealized gain	0
Cash equivalents paper, unrealized loss	0
Cash equivalents, estimated fair value	24,000,000
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	101,000,000	216,000,000
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	0	0
Short-term marketable securities, estimated fair value	101,000,000	216,000,000
Corporate bonds
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	461,000,000	290,000,000
Short-term marketable securities, unrealized gains	1,000,000	0
Short-term marketable securities, unrealized losses	0	(1,000,000)
Short-term marketable securities, estimated fair value	462,000,000	289,000,000
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	463,000,000	382,000,000
Long-term marketable securities, unrealized gains	4,000,000	2,000,000
Long-term marketable securities, unrealized losses	0	(1,000,000)
Long-term marketable securities, estimated fair value	467,000,000	383,000,000
U.S. government agency securities
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	46,000,000	162,000,000
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	0	0
Short-term marketable securities, estimated fair value	46,000,000	162,000,000
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	68,000,000	55,000,000
Long-term marketable securities, unrealized gains	1,000,000	0
Long-term marketable securities, unrealized losses	0	0
Long-term marketable securities, estimated fair value	69,000,000	$ 55,000,000
Mutual funds
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	45,000,000
Short-term marketable securities, unrealized gains	0
Short-term marketable securities, unrealized losses	0
Short-term marketable securities, estimated fair value	$ 45,000,000

Cash and Cash Equivalents and Available-For-Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax

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Amount 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).

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