Goodwill and Acquired Intangible Assets - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Jul. 21, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 56		$ 56
Amortized intangible assets				5	$ 10
Expected amortization of 2025		4		4
Expected amortization of 2026		3		3
Expected amortization of 2027		1		$ 1
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]					Acquired intangible assets impairment and amortization expense
Nitro | Tradename and trademarks
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 56		$ 56
Scholly, Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill						$ 5
Scholly, Inc. | Partner relationship
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets		$ 1