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Business Segments Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 5    
Other Revenues under the Group Reporting Basis [Member]      
Segment Reporting Information [Line Items]      
Loss from the fair value movement on structured notes and deposits attributable to our own credit spread   $ 49  
IFRS 9 [Member] | Group Reporting Basis [Member] | Retained Earnings [Member]      
Segment Reporting Information [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ (60)
IFRS 9 [Member] | Group Reporting Basis [Member] | Customer Loan Allowance for ECL [Member]      
Segment Reporting Information [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ 60