Balance Sheet Components - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash equivalents
Cash equivalents, cost or amortized cost	$ 1,977	$ 2,504	$ 4,345
Short-term marketable securities
Short-term marketable securities, estimated fair value	1,544	1,253
Long-term marketable securities
Long-term marketable securities, estimated fair value	397	650
Total	2,850	2,501
Total, unrealized gains	0	0
Total, unrealized losses	(20)	(4)
Total, estimated fair value	2,830	2,497
Money market funds
Cash equivalents
Cash equivalents, cost or amortized cost	886	544
Cash equivalents, unrealized gain	0	0
Cash equivalents paper, unrealized loss	0	0
Cash equivalents, estimated fair value	886	544
U.S. Treasury securities
Cash equivalents
Cash equivalents, cost or amortized cost		50
Cash equivalents, unrealized gain		0
Cash equivalents paper, unrealized loss		0
Cash equivalents, estimated fair value		50
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	970	671
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	(13)	(1)
Short-term marketable securities, estimated fair value	957	670
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	210	489
Long-term marketable securities, unrealized gains	0	0
Long-term marketable securities, unrealized losses	(2)	(2)
Long-term marketable securities, estimated fair value	208	487
Commercial paper
Cash equivalents
Cash equivalents, cost or amortized cost	3
Cash equivalents, unrealized gain	0
Cash equivalents paper, unrealized loss	0
Cash equivalents, estimated fair value	3
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	306	373
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	0	0
Short-term marketable securities, estimated fair value	306	373
Corporate bonds
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	207	141
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	(2)	0
Short-term marketable securities, estimated fair value	205	141
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	146	115
Long-term marketable securities, unrealized gains	0	0
Long-term marketable securities, unrealized losses	(1)	(1)
Long-term marketable securities, estimated fair value	145	114
U.S. government agency securities
Short-term marketable securities
Short-term marketable securities, cost or amortized cost	78	69
Short-term marketable securities, unrealized gains	0	0
Short-term marketable securities, unrealized losses	(2)	0
Short-term marketable securities, estimated fair value	76	69
Long-term marketable securities
Long-term marketable securities, cost or amortized cost	44	49
Long-term marketable securities, unrealized gains	0	0
Long-term marketable securities, unrealized losses	0	0
Long-term marketable securities, estimated fair value	$ 44	$ 49