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Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Pledged Assets related to secured borrowings [Line Items]    
Pledged financial instruments, investment securities $ 72 $ 2,698
Pledged assets, mortgage assets held-for-investment and lending receivables 17,256 17,135
Pledged assets, restricted as collateral 40,590 46,204
Secured Debt 19,146 25,773
Short-term borrowings 3,689 5,531
Secured debt    
Pledged Assets related to secured borrowings [Line Items]    
Short-term borrowings 1,179 2,950
Consumer portfolio segment | Automotive loan    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 12,341 13,481
Commercial portfolio segment | Automotive loan    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 10,921 12,890
Ally Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged financial instruments, investment securities 72 2,698
Pledged assets, mortgage assets held-for-investment and lending receivables 17,256 17,135
Pledged assets, restricted as collateral 39,739 44,257
Secured Debt 18,410 24,069
Ally Bank | Pledged assets for Federal Home Loan Bank    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, restricted as collateral 22,100 24,800
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 portfolio segment | Automotive loan    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables 11,490 11,534
Ally Bank | Commercial portfolio segment | Automotive loan    
Pledged Assets related to secured borrowings [Line Items]    
Pledged assets, finance receivables $ 10,921 $ 12,890