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Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, mortgage finance receivables $ 13,968 $ 14,979
Pledged assets, restricted as collateral 25,775 35,798
Secured debt 7,006 9,992
Consumer | Consumer automotive    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 9,660 9,953
Commercial | Consumer automotive    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 2,147 10,866
Ally Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, mortgage finance receivables 13,968 14,979
Pledged assets, restricted as collateral 25,359 35,355
Secured debt 6,700 9,634
Ally Bank | Pledged assets for Federal Home Loan Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, restricted as collateral 14,000 20,000
Ally Bank | Pledged assets for Federal Reserve Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, restricted as collateral 2,400 2,400
Ally Bank | Consumer | Consumer automotive    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 9,244 9,510
Ally Bank | Commercial | Consumer automotive    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables $ 2,147 $ 10,866