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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in unconsolidated subsidiaries $ 438 $ 890
Warehouse receivables 1,647 561
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 46 43
Equity securities 18 18
Investments in unconsolidated subsidiaries 24 512
Warehouse receivables 1,647 561
Derivative assets 50 43
Other assets   46
Total assets at fair value 1,785 1,223
Contingent consideration 31 36
Derivative liabilities 454  
Total liabilities at fair value 485 36
Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 4 3
Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 35 33
Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7 7
Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 4 3
Equity securities 18 18
Investments in unconsolidated subsidiaries 0 100
Warehouse receivables 0 0
Derivative assets 0 0
Other assets   0
Total assets at fair value 22 121
Contingent consideration 0 0
Derivative liabilities 0  
Total liabilities at fair value 0 0
Level 1 | Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 4 3
Level 1 | Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0 0
Level 1 | Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0 0
Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 42 40
Equity securities 0 0
Investments in unconsolidated subsidiaries 0 0
Warehouse receivables 1,647 561
Derivative assets 50 43
Other assets   0
Total assets at fair value 1,739 644
Contingent consideration 0 0
Derivative liabilities 454  
Total liabilities at fair value 454 0
Level 2 | Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0 0
Level 2 | Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 35 33
Level 2 | Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 7 7
Level 3 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries 24 412
Warehouse receivables 0 0
Derivative assets 0 0
Other assets   46
Total assets at fair value 24 458
Contingent consideration 31 36
Derivative liabilities 0  
Total liabilities at fair value 31 36
Level 3 | Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0 0
Level 3 | Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities 0 0
Level 3 | Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale debt securities $ 0 $ 0