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Business Segments Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 5    
Lease, term of contract 10 years    
Lease, extension term 5 years    
Operating Segments [Member] | RBWM [Member]      
Segment Reporting Information [Line Items]      
Increase (decrease) in segment profit before tax during the year ended December 31:   $ 7 $ (4)
Increase (decrease) in segment total assets at December 31:   (585) (696)
Increase (decrease) in segment total deposits at December 31:   0 0
Operating Segments [Member] | CMB [Member]      
Segment Reporting Information [Line Items]      
Increase (decrease) in segment profit before tax during the year ended December 31:   13 8
Increase (decrease) in segment total assets at December 31:   0 0
Increase (decrease) in segment total deposits at December 31:   0 0
Operating Segments [Member] | GBM [Member]      
Segment Reporting Information [Line Items]      
Increase (decrease) in segment profit before tax during the year ended December 31:   (192) (144)
Increase (decrease) in segment total assets at December 31:   (107,780) (78,783)
Increase (decrease) in segment total deposits at December 31:   (6,989) (5,011)
Operating Segments [Member] | PB [Member]      
Segment Reporting Information [Line Items]      
Increase (decrease) in segment profit before tax during the year ended December 31:   5 4
Increase (decrease) in segment total assets at December 31:   0 0
Increase (decrease) in segment total deposits at December 31:   0 0
Operating Segments [Member] | CC (as compared with previously reported Other) [Member]      
Segment Reporting Information [Line Items]      
Increase (decrease) in segment profit before tax during the year ended December 31:   167 136
Increase (decrease) in segment total assets at December 31:   108,365 79,479
Increase (decrease) in segment total deposits at December 31:   6,989 5,011
Group Reporting Basis, Other Operating Income [Member]      
Segment Reporting Information [Line Items]      
Gain (loss) from change in fair value of debt attributable to credit spread   $ (3) $ 194