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Financing Receivables - Collectively Evaluated Financing Receivables (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Maximum    
Financing receivables    
Reasonable and supportable economic forecast duration 2 years  
Accounting Standards Update 2016-13 | Adjustment    
Financing receivables    
Financing receivables - credit allowance, including related off-balance sheet commitments)   $ 64