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Loans Held for Sale (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale $ 289 $ 512
Commercial Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale 212 394
Commercial Loans [Member] | Real Estate, Including Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale 83 27
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale 35 0
Commercial Loans [Member] | Global Banking [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale 94 367
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale 77 118
Consumer Loans [Member] | Residential Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale 77 65
Consumer Loans [Member] | Other consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans held for sale $ 0 $ 53