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Commitments and Contingencies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 45,500  
Letters of credit outstanding 272  
Accrued loan loss 63 $ 67
Assets available for recourse 1,800  
Guarantees total 211  
Recognized revenue included in contract liability (214)  
Deferred and contingent consideration 93 266
Indirect tax liability 91 3
Commitments to investment in future real estate investment $ 205  
Commitments to investment in future real estate investment 0.50  
Commitment to investment in consolidated projects $ 330  
Commitments to investment in unconsolidated real estate subsidiary 67  
Accounts Payable, Accrued Expenses and Long-term Deferred and Contingent Consideration    
Loss Contingencies [Line Items]    
Recognized revenue included in contract liability 199 264
Performance Guarantee    
Loss Contingencies [Line Items]    
Loss contingency, estimate of possible loss 808 242
Warehouse Receivable    
Loss Contingencies [Line Items]    
Warehouse receivables 232  
Funded loans subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 42,100  
Letters of credit outstanding 160 140
SBL Program    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 5 $ 5
Percentage of maximum original principal amount loan loss 10.00%  
Funded loans not subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 165