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Related Party Transactions - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]        
Revenues   $ 15,875,000,000 $ 14,224,000,000 $ 12,766,000,000
Income tax payable     384,000,000  
Related party tax payments     72,000,000 690,000,000
Line of Credit        
Related Party Transaction [Line Items]        
Debt instrument term (in years)   5 years    
Line of Credit | General Motors | Five Year Revolving Credit Facility        
Related Party Transaction [Line Items]        
Debt instrument term (in years)   5 years    
Current borrowing capacity   $ 10,000,000,000.0    
Line of Credit | General Motors | 364-Day Revolving Credit Facility        
Related Party Transaction [Line Items]        
Debt instrument term (in years) 364 days      
Revolving credit facilities | Line of Credit | Cruise, LLC        
Related Party Transaction [Line Items]        
Commercial finance receivables due from Cruise   395,000,000 353,000,000  
Revolving credit facilities | Line of Credit | General Motors        
Related Party Transaction [Line Items]        
Maximum borrowing capacity   $ 14,100,000,000    
Revolving credit facilities | Line of Credit | General Motors | Three Year Revolving Credit Facility        
Related Party Transaction [Line Items]        
Debt instrument term (in years)   3 years    
Current borrowing capacity   $ 4,100,000,000    
Revolving credit facilities | Line of Credit | General Motors | 364-Day Revolving Credit Facility        
Related Party Transaction [Line Items]        
Maximum borrowing capacity   $ 2,000,000,000.0    
Debt instrument term (in years)   364 days    
Junior Subordinated Revolving Credit Facility | General Motors        
Related Party Transaction [Line Items]        
Line of credit facilities - GM related party facility   $ 1,000,000,000.0    
GM        
Related Party Transaction [Line Items]        
Revenues   3,800,000,000 3,500,000,000 $ 2,400,000,000
Related Party        
Related Party Transaction [Line Items]        
Income tax payable     $ 384,000,000  
Income taxes receivable   $ 70,000,000