Business Segments - Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) segment
Segment Reporting Information [Line Items]
Number of major reportable business segments | segment	4
Asset Management
Segment Reporting Information [Line Items]
Asset Management client assets	$ 2,400,000,000,000
Minimum | Commercial Banking
Segment Reporting Information [Line Items]
Annual client revenue	20,000,000
Maximum | Commercial Banking
Segment Reporting Information [Line Items]
Annual client revenue	$ 2,000,000,000