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Fair Value Measurements - Fair Value of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in unconsolidated subsidiaries $ 890 $ 997
Warehouse receivables $ 561 675
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets, net  
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities $ 43 68
Equity securities 18 41
Investments in unconsolidated subsidiaries 512 645
Warehouse receivables 561 675
Derivative assets 43  
Other assets 46 16
Total assets at fair value 1,223 1,445
Contingent consideration 36 36
Derivative liabilities   5
Total liabilities at fair value 36 41
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 3 12
Equity securities 18 41
Investments in unconsolidated subsidiaries 100 168
Warehouse receivables 0 0
Derivative assets 0  
Other assets 0 0
Total assets at fair value 121 221
Contingent consideration 0 0
Derivative liabilities   0
Total liabilities at fair value 0 0
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 40 56
Equity securities 0 0
Investments in unconsolidated subsidiaries 0 0
Warehouse receivables 561 675
Derivative assets 43  
Other assets 0 0
Total assets at fair value 644 731
Contingent consideration 0 0
Derivative liabilities   5
Total liabilities at fair value 0 5
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 0 0
Equity securities 0 0
Investments in unconsolidated subsidiaries 412 477
Warehouse receivables 0 0
Derivative assets 0  
Other assets 46 16
Total assets at fair value 458 493
Contingent consideration 36 36
Derivative liabilities   0
Total liabilities at fair value 36 36
Recurring | U.S. treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 3 12
Recurring | U.S. treasury securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 3 12
Recurring | U.S. treasury securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 0 0
Recurring | U.S. treasury securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 0 0
Recurring | Debt securities issued by U.S. federal agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities   11
Recurring | Debt securities issued by U.S. federal agencies | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities   0
Recurring | Debt securities issued by U.S. federal agencies | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities   11
Recurring | Debt securities issued by U.S. federal agencies | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities   0
Recurring | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 33 44
Recurring | Corporate debt securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 0 0
Recurring | Corporate debt securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 33 44
Recurring | Corporate debt securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 0 0
Recurring | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 7 1
Recurring | Asset-backed securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 0 0
Recurring | Asset-backed securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities 7 1
Recurring | Asset-backed securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available for sale debt securities $ 0 $ 0