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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-Term Debt, Maturity, Remainder of Fiscal Year $ 1,317  
Long-term debt, maturities, repayments of principal in next 12 months 7,328  
Long-term debt, maturities, repayments of principal in year two 6,494  
Long-term debt, maturities, repayments of principal in year three 2,188  
Long-term debt, maturities, repayments of principal in year four 1,474  
Long-term debt, maturities, repayments of principal after year five 6,903  
Total long-term debt 25,704 $ 34,027
Pledged assets, restricted as collateral 37,921 46,204
Ally Bank    
Debt Instrument [Line Items]    
Pledged assets, restricted as collateral 37,273 44,257
Unsecured debt    
Debt Instrument [Line Items]    
Long-Term Debt, Maturity, Remainder of Fiscal Year (8)  
Long-term debt, maturities, repayments of principal in next 12 months 645  
Long-term debt, maturities, repayments of principal in year two 1,063  
Long-term debt, maturities, repayments of principal in year three 1,590  
Long-term debt, maturities, repayments of principal in year four 1,405  
Long-term debt, maturities, repayments of principal after year five 6,861  
Total long-term debt 11,556 11,204
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 14,148 22,823
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-Term Debt, Maturity, Remainder of Fiscal Year 5  
Long-term debt, maturities, repayments of principal in next 12 months 699  
Long-term debt, maturities, repayments of principal in year two 1,122  
Long-term debt, maturities, repayments of principal in year three 1,654  
Long-term debt, maturities, repayments of principal in year four 1,474  
Long-term debt, maturities, repayments of principal after year five 7,686  
Total long-term debt 12,640  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-Term Debt, Maturity, Remainder of Fiscal Year 1,325  
Long-term debt, maturities, repayments of principal in next 12 months 6,683  
Long-term debt, maturities, repayments of principal in year two 5,431  
Long-term debt, maturities, repayments of principal in year three 598  
Long-term debt, maturities, repayments of principal in year four 69  
Long-term debt, maturities, repayments of principal after year five 42  
Total long-term debt 14,148  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (13)  
Debt instrument, unamortized discount (1,084)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (54)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (59)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (64)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (69)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (825)  
Pledged assets for Federal Reserve Bank | Ally Bank    
Debt Instrument [Line Items]    
Pledged assets, restricted as collateral $ 2,400 $ 2,400