Goodwill and Intangible Assets - Goodwill (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Goodwill [Line Items]
Total Goodwill	$ 69,784	$ 69,844
Operating Segments \| Consumer & Business Banking
Goodwill [Line Items]
Total Goodwill	31,681	31,681
Operating Segments \| Global Wealth & Investment Management
Goodwill [Line Items]
Total Goodwill	9,698	9,698
Operating Segments \| Global Banking
Goodwill [Line Items]
Total Goodwill	22,377	22,377
Operating Segments \| Global Markets
Goodwill [Line Items]
Total Goodwill	5,197	5,197
All Other
Goodwill [Line Items]
Total Goodwill	$ 831	$ 891