v3.26.1
Segment Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
segment
subsegment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 3    
Number of reportable segments | segment 3    
Number of operating subsegments | subsegment 2    
Segment Reporting Information [Line Items]      
Total financing revenue and other interest income $ 3,374 $ 3,393  
Total interest expense 1,517 1,675  
Net depreciation expense on operating lease assets 268 240  
Net financing revenue and other interest income 1,589 1,478  
Other revenue 513 63  
Total net revenue 2,102 1,541  
Provision for credit losses 467 191  
Compensation and benefits expense 491 505  
Insurance losses and loss adjustment expenses 121 161  
Goodwill impairment 0 305 $ 305
Other operating expenses      
Technology and communications 101 103  
Other 522 560  
Total other operating expenses 623 663  
Total noninterest expense 1,235 1,634  
Income (loss) from continuing operations before income tax expense (benefit) 400 (284)  
Total assets 197,269 193,331 196,002
Net financing revenue and other interest income after the provision for credit losses 1,100 1,300  
Operating Segments | Automotive Finance operations      
Segment Reporting Information [Line Items]      
Total financing revenue and other interest income 2,687 2,571  
Total interest expense 1,128 1,065  
Net depreciation expense on operating lease assets 268 240  
Net financing revenue and other interest income 1,291 1,266  
Other revenue 105 97  
Total net revenue 1,396 1,363  
Provision for credit losses 468 434  
Compensation and benefits expense 191 183  
Insurance losses and loss adjustment expenses 0 0  
Goodwill impairment 0 0 0
Other operating expenses      
Technology and communications 28 29  
Other 373 342  
Total other operating expenses 401 371  
Total noninterest expense 592 554  
Income (loss) from continuing operations before income tax expense (benefit) 336 375  
Total assets 117,612 111,672  
Operating Segments | Insurance operations      
Segment Reporting Information [Line Items]      
Total financing revenue and other interest income 49 44  
Total interest expense 13 14  
Net depreciation expense on operating lease assets 0 0  
Net financing revenue and other interest income 36 30  
Other revenue 342 364  
Total net revenue 378 394  
Provision for credit losses 0 0  
Compensation and benefits expense 32 30  
Insurance losses and loss adjustment expenses 121 161  
Goodwill impairment 0 0 0
Other operating expenses      
Technology and communications 4 5  
Other 193 196  
Total other operating expenses 197 201  
Total noninterest expense 350 392  
Income (loss) from continuing operations before income tax expense (benefit) 28 2  
Total assets 9,888 9,489  
Operating Segments | Corporate Finance operations      
Segment Reporting Information [Line Items]      
Total financing revenue and other interest income 243 221  
Total interest expense 130 117  
Net depreciation expense on operating lease assets 0 0  
Net financing revenue and other interest income 113 104  
Other revenue 35 29  
Total net revenue 148 133  
Provision for credit losses 8 14  
Compensation and benefits expense 26 25  
Insurance losses and loss adjustment expenses 0 0  
Goodwill impairment   0  
Other operating expenses      
Technology and communications 1 1  
Other 19 17  
Total other operating expenses 20 18  
Total noninterest expense 46 43  
Income (loss) from continuing operations before income tax expense (benefit) 94 76  
Total assets 13,803 11,002  
Corporate and Other      
Segment Reporting Information [Line Items]      
Total financing revenue and other interest income 395 557  
Total interest expense 246 479  
Net depreciation expense on operating lease assets 0 0  
Net financing revenue and other interest income 149 78  
Other revenue 31 (427)  
Total net revenue 180 (349)  
Provision for credit losses (9) (257)  
Compensation and benefits expense 242 267  
Insurance losses and loss adjustment expenses 0 0  
Goodwill impairment 0 305 $ 305
Other operating expenses      
Technology and communications 68 68  
Other (63) 5  
Total other operating expenses 5 73  
Total noninterest expense 247 645  
Income (loss) from continuing operations before income tax expense (benefit) (58) (737)  
Total assets $ 55,966 $ 61,168