Investment Securities (Hedge Funds and Private Equity Funds) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014 fund
Hedge funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of investments	16
Private equity funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of investments	36
Hedge and private equity funds included in other long-term investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Largest single fund investment	$ 19.3