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Finance Receivables - Modified as TDR - Non Performing Finance Receivables (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
account
Jun. 30, 2020
USD ($)
account
Jun. 30, 2021
USD ($)
account
Jun. 30, 2020
USD ($)
account
Receivables [Abstract]        
TDR net finance receivables | $ $ 27 $ 26 $ 56 $ 57
Number of TDR accounts | account 3,743 3,787 7,926 8,339