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Related Party Transactions - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]            
Revenues   $ 3,918,000,000 $ 3,498,000,000 $ 7,729,000,000 $ 6,840,000,000  
Related party tax payment       $ 0 30,000,000  
Line of Credit | General Motors | Five Year Revolving Credit Facility            
Related Party Transaction [Line Items]            
Debt instrument term       5 years    
Current borrowing capacity   10,000,000,000   $ 10,000,000,000    
Line of Credit | General Motors | 364 Day Revolving Credit Facilities            
Related Party Transaction [Line Items]            
Debt instrument term 364 days          
Revolving Credit Facility            
Related Party Transaction [Line Items]            
Maximum borrowing capacity   17,000,000,000.0   17,000,000,000.0    
Revolving Credit Facility | Line of Credit | Cruise            
Related Party Transaction [Line Items]            
Maximum borrowing capacity   3,400,000,000   3,400,000,000   $ 3,400,000,000
Revolving Credit Facility | Line of Credit | General Motors            
Related Party Transaction [Line Items]            
Maximum borrowing capacity   14,100,000,000   $ 14,100,000,000    
Revolving Credit Facility | Line of Credit | General Motors | Three Year Revolving Credit Facility            
Related Party Transaction [Line Items]            
Debt instrument term       3 years    
Current borrowing capacity   4,100,000,000   $ 4,100,000,000    
Revolving Credit Facility | Line of Credit | General Motors | 364 Day Revolving Credit Facilities            
Related Party Transaction [Line Items]            
Maximum borrowing capacity   2,000,000,000.0   $ 2,000,000,000.0    
Debt instrument term       364 days    
Revolving Credit Facility | Commercial Finance Receivables | Line of Credit | Cruise            
Related Party Transaction [Line Items]            
Commercial finance receivables due from cruise   395,000,000   $ 395,000,000   $ 353,000,000
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   1,000,000,000.0    
GM            
Related Party Transaction [Line Items]            
Revenues   $ 934,000,000 $ 915,000,000 $ 1,700,000,000 $ 1,700,000,000