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Loans To And Investments In Associated Companies (Berkadia) (Narrative) (Details) (Berkadia [Member], USD $) In Billions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Berkadia [Member]
Surety policy issued	$ 2.5
Reimbursement of losses incurred, maximum percentage	50.00%
Commercial paper	$ 2.47

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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