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Debt - Narrative (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 0	$ 0	$ 0	$ 1
2025 Notes | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, repurchased face amount			$ 88		88
Cash paid for repurchase					89
Loss on extinguishment of debt					$ 1
Repayment of principal amount				419
Payments for debt				425
Payments for debt, accrued interest				6
2026 Notes | Convertible Debt | Common Class C
Debt Instrument [Line Items]
Capped call transactions, portion unwound, shares received (in shares)	3.1
Capped call transactions, portion unwound, cash received	$ 38
Atlas Securitized Products, L.P., JPMorgan Chase Bank, N.A, Citibank, N.A. | Mortgages Segment
Debt Instrument [Line Items]
Short-term debt		$ 284		$ 284		$ 151

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