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Operating Lease Equipment - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property Subject To Or Available For Operating Lease [Line Items]          
Operating lease equipment $ 894   $ 894   $ 518
Other asset impairment charges     (1) $ 2  
Operating lease income relating to lease payments     (67) 0  
Operating lease equipment          
Property Subject To Or Available For Operating Lease [Line Items]          
Operating lease income relating to lease payments $ 45 $ 22 $ 66 45  
Operating lease equipment | Commercial Banking          
Property Subject To Or Available For Operating Lease [Line Items]          
Other asset impairment charges       $ 2