v3.26.1
Securitizations and Variable Interest Entities - Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together (Details) - Off-balance sheet variable interest entities - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Total amount $ 3,379   $ 3,192
Amount 60 days or more past due 159   161
Net credit losses 45 $ 35  
Off-balance-sheet securitization entities | Consumer automotive | Consumer      
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Total amount 858   1,002
Amount 60 days or more past due 16   18
Net credit losses 4 5  
Whole-loan sales | Consumer automotive | Consumer      
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Total amount 2,521   2,190
Amount 60 days or more past due 143   $ 143
Net credit losses 41 23  
Whole-loan sales | Other | Consumer      
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Net credit losses $ 0 $ 7