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Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, mortgage finance receivables [1] $ 31,743 $ 33,587
Pledged assets, finance receivables 125,007 119,001
Pledged assets, restricted as collateral 37,556 27,420
Secured debt 15,584 7,619
Short-term borrowings 7,775 0
Consumer | Collateralized Mortgage Backed Securities    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, mortgage finance receivables 19,210 17,941
Consumer | Automotive loan    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 9,960 9,122
Consumer | Investment securities    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 3,386 0
Consumer | Credit card receivables    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 0 347
Commercial    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 5,000 10
Ally Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, restricted as collateral 37,556 27,420
Secured debt 15,584 7,619
Ally Bank | Pledged assets for Federal Home Loan Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, restricted as collateral 26,600 18,000
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 | Collateralized Mortgage Backed Securities    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, mortgage finance receivables 19,210 17,941
Ally Bank | Consumer | Automotive loan    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 9,960 9,122
Ally Bank | Consumer | Investment securities    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 3,386 0
Ally Bank | Consumer | Credit card receivables    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 0 347
Ally Bank | Commercial    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables $ 5,000 $ 10
[1] Refer to Note 7 for discussion of investment securities pledged as collateral.