v3.26.1
Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 307 $ 323    
All other revenue 206 (260)    
Total other revenue 513 63    
Remarketing losses, net 10 19    
Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Remarketing losses, net 10 19    
Noninsurance contracts        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 242 241    
Noninsurance contracts | Insurance operations        
Disaggregation of Revenue [Line Items]        
Unearned revenue, remaining performance obligation, amount 3,000 3,000 $ 3,000 $ 3,000
Unearned revenue, revenue recognized 239 238    
Capitalized contract cost, net 1,800 1,800 $ 1,800 $ 1,800
Capitalized contract cost, amortization 138 141    
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01        
Disaggregation of Revenue [Line Items]        
Unearned revenue, remaining performance obligation, amount $ 653      
Remaining performance obligation, expected timing of satisfaction, period 9 months      
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01        
Disaggregation of Revenue [Line Items]        
Unearned revenue, remaining performance obligation, amount $ 751      
Remaining performance obligation, expected timing of satisfaction, period 1 year      
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01        
Disaggregation of Revenue [Line Items]        
Unearned revenue, remaining performance obligation, amount $ 599      
Remaining performance obligation, expected timing of satisfaction, period 1 year      
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01        
Disaggregation of Revenue [Line Items]        
Unearned revenue, remaining performance obligation, amount $ 440      
Remaining performance obligation, expected timing of satisfaction, period 1 year      
Noninsurance contracts | Insurance operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01        
Disaggregation of Revenue [Line Items]        
Unearned revenue, remaining performance obligation, amount $ 544      
Remaining performance obligation, expected timing of satisfaction, period      
Remarketing fee income        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 32 31    
Brokerage commissions and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 19 20    
Banking fees and interchange income        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 5 19    
Customer rewards expense   6    
Brokered/agent commissions        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2 5    
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7 7    
Operating Segments | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 38 36    
All other revenue 67 61    
Total other revenue 105 97    
Operating Segments | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 244 247    
All other revenue 98 117    
Total other revenue 342 364    
Operating Segments | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
All other revenue 35 29    
Total other revenue 35 29    
Operating Segments | Noninsurance contracts | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Noninsurance contracts | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 242 241    
Operating Segments | Noninsurance contracts | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Remarketing fee income | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 32 31    
Operating Segments | Remarketing fee income | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Remarketing fee income | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Brokerage commissions and other revenue | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Brokerage commissions and other revenue | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Brokerage commissions and other revenue | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Banking fees and interchange income | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Banking fees and interchange income | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Banking fees and interchange income | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Brokered/agent commissions | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Brokered/agent commissions | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 2 5    
Operating Segments | Brokered/agent commissions | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Operating Segments | Other | Automotive Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6 5    
Operating Segments | Other | Insurance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 1    
Operating Segments | Other | Corporate Finance operations        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Corporate and Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 25 40    
All other revenue 6 (467)    
Total other revenue 31 (427)    
Corporate and Other | Noninsurance contracts        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Corporate and Other | Remarketing fee income        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Corporate and Other | Brokerage commissions and other revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 19 20    
Corporate and Other | Banking fees and interchange income        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 5 19    
Corporate and Other | Brokered/agent commissions        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0    
Corporate and Other | Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 1 $ 1