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Financial Instruments - Schedule of Balances of Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Cash equivalents:
Amortized Cost	$ 874	$ 1,082
Short-term investments:
Amortized Cost	513
Estimated Fair Market Value	515
Mortgage origination-related:
Mortgage loans held for sale	291	159
Restricted cash	5	3
Total assets measured at fair value on a recurring basis, Amortized cost	1,392	1,863
Total assets measured at fair value on a recurring basis, Estimated fair market value	1,695	2,025
Liabilities
Contingent consideration - accrued expenses and other current liabilities	32	33
Contingent consideration - other long-term liabilities	31	58
Liabilities measured at fair value	64	91
U.S. government treasury securities
Short-term investments:
Amortized Cost	353	594
Estimated Fair Market Value	354	591
Corporate bonds
Short-term investments:
Amortized Cost	152	175
Estimated Fair Market Value	153	176
U.S. government agency securities
Short-term investments:
Amortized Cost	7	7
Estimated Fair Market Value	7	7
Certificate of deposit
Short-term investments:
Amortized Cost	1	0
Estimated Fair Market Value	1	0
Commercial paper
Short-term investments:
Amortized Cost	0	2
Estimated Fair Market Value	0	2
IRLCs - other current assets
Mortgage origination-related:
IRLCs - other current assets	9	4
Forward contracts - accrued expenses and other current liabilities
Mortgage origination-related:
IRLCs - other current assets	1	1
Liabilities
Forward contracts - accrued expenses and other current liabilities	1	0
Cash
Cash equivalents:
Amortized Cost	20	13
Estimated Fair Market Value	20	13
Money market funds
Cash equivalents:
Amortized Cost	741	993
Estimated Fair Market Value	741	993
U.S. government treasury securities
Cash equivalents:
Amortized Cost	113	75
Estimated Fair Market Value	113	75
Commercial paper
Cash equivalents:
Amortized Cost	0	1
Estimated Fair Market Value	$ 0	$ 1

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