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Loan Portfolio - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]        
Minimum future lease payment to be received, 2019 $ 1,000      
Minimum future lease payment to be received, 2020 878      
Minimum future lease payment to be received, 2021 609      
Minimum future lease payment to be received, 2022 399      
Minimum future lease payment to be received, 2023 238      
Minimum future lease payment to be received, subsequent years 416      
Allowance related to lease financing receivables 897 $ 893 $ 882 $ 824
Continuing Operations [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance related to lease financing receivables 883 877 858 796
Continuing Operations [Member] | Commercial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance related to lease financing receivables 743 735 716 656
Continuing Operations [Member] | Commercial Loans [Member] | Commercial Lease Financing [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance related to lease financing receivables $ 36 $ 43 $ 42 $ 47