Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Total goodwill	$ 69,761,000,000	$ 69,777,000,000
Operating Segments | Consumer Banking
Goodwill [Line Items]
Total goodwill	30,123,000,000	30,123,000,000
Operating Segments | Global Wealth & Investment Management
Goodwill [Line Items]
Total goodwill	9,698,000,000	9,698,000,000
Operating Segments | Global Banking
Goodwill [Line Items]
Total goodwill	23,923,000,000	23,923,000,000
Operating Segments | Global Markets
Goodwill [Line Items]
Total goodwill	5,197,000,000	5,197,000,000
Operating Segments | Legacy Assets & Servicing
Goodwill [Line Items]
Total goodwill	0	0
All Other
Goodwill [Line Items]
Total goodwill	$ 820,000,000	$ 836,000,000