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Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
swap
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Restricted cash $ 107,000,000 $ 106,000,000  
Lease term on real estate under development (in years) 10 years    
Debt agreement term 11 years    
Line of credit debt issuance costs $ 6,000,000 9,000,000  
Business promotion and advertising costs 82,000,000 74,000,000 $ 85,000,000
Estimated fair value of mortgage servicing rights 1,100,000,000 1,200,000,000 1,100,000,000
Mortgage servicing rights, impairment charges $ 0 0 0
Ancillary Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue    
Late Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue    
Revenue $ 35,103,000,000 31,404,000,000 30,174,000,000
Prepayment fees/late fees earned from loans servicing 9,000,000 5,000,000 23,000,000
Ancillary income earned from loans servicing 151,000,000 108,000,000 23,000,000
Reserve for claims insurance programs 197,000,000 180,000,000  
Reserve for claims insurance programs, current $ 4,000,000 4,000,000  
Number of outstanding swaps | swap 7    
Gain (loss) on foreign currency transaction $ 43,000,000    
Servicing fees      
Summary Of Significant Accounting Policies [Line Items]      
Revenue $ 329,000,000 $ 315,000,000 $ 309,000,000
Wholly Owned Property      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest in property 100.00%    
Commercial Real Estate      
Summary Of Significant Accounting Policies [Line Items]      
Ownership interest in property 0.00%    
Enterprise software development platforms      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful life 3 years    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful life 10 years    
Maximum | Buildings and Improvements      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful life 39 years    
Maximum | Land Improvements      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful life 15 years    
Maximum | Enterprise software development platforms      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful life 7 years    
Minimum | Enterprise software development platforms      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful life 3 years