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Leasing (Ally as the Lessee) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Lessee, Lease, Description [Line Items]          
Noncancelable lease term     367 days    
Lease extension, maximum     48 months    
Cash paid for amounts included in the measurement of lease liabilities $ 9 $ 16 $ 19 $ 29  
Right-of-use asset obtained in exchange for operating lease liability     $ 21 $ 333  
Operating lease, weighted-average remaining lease term 5 years   5 years   6 years
Operating lease, weighted average discount rate 2.24%   2.24%   1.96%
Undiscounted future lease payments $ 13   $ 13    
Term of contract 10 years   10 years    
New fixed assets $ 44   $ 44    
Minimum          
Lessee, Lease, Description [Line Items]          
Operating lease remaining lease term 1 month   1 month    
Option to terminate     5 years    
Maximum          
Lessee, Lease, Description [Line Items]          
Operating lease remaining lease term 7 years   7 years    
Option to terminate     6 years    
Land and Building | Minimum          
Lessee, Lease, Description [Line Items]          
Option to extend 1 year   1 year    
Land and Building | Maximum          
Lessee, Lease, Description [Line Items]          
Option to extend 15 years   15 years