Investments In Associated Companies (Narrative) (Details) (USD $)	Jun. 30, 2012
Jefferies Group, Inc. [Member]
Investments In Associated Companies [Line Items]
Shares of common stock owned	58,006,024
Percentage of shares owned	28.50%
Berkadia [Member]
Investments In Associated Companies [Line Items]
Reimbursement of losses incurred, maximum percentage	50.00%
Surety policy issued	2,500,000,000
Commercial paper	2,470,000,000
Mueller [Member]
Investments In Associated Companies [Line Items]
Shares of common stock owned	10,422,859
Percentage of shares owned	27.30%