Cash, Cash Equivalents and Marketable Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Our Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 841	$ 992
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	841	992
Money market funds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	171	120
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	171	120
U.S. treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	246	251
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	246	251
Corporate securities and commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	406	592
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	406	592
U.S. government agency securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost		5
Unrealized Gain		0
Unrealized Loss		0
Fair Value		5
Certificate of deposit
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	18	24
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	$ 18	$ 24