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Intangible Assets - Changes in Carrying Value of Goodwill (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Goodwill, Beginning Balance $ 9,361 $ 9,389 $ 9,205
Goodwill acquired     217
Foreign exchange translation and other (17) (28) (33)
Goodwill, Ending Balance 9,344 9,361 9,389
Wholesale Banking and Commercial Real Estate [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance 1,647 1,648 1,605
Goodwill acquired     43
Foreign exchange translation and other   (1)  
Goodwill, Ending Balance 1,647 1,647 1,648
Consumer and Small Business Banking [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance 3,681 3,680 3,514
Goodwill acquired     166
Foreign exchange translation and other   1  
Goodwill, Ending Balance 3,681 3,681 3,680
Wealth Management and Securities Services [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance 1,567 1,570 1,565
Goodwill acquired     8
Foreign exchange translation and other (1) (3) (3)
Goodwill, Ending Balance 1,566 1,567 1,570
Payment Services [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance 2,466 2,491 2,521
Foreign exchange translation and other (16) (25) (30)
Goodwill, Ending Balance $ 2,450 $ 2,466 $ 2,491