Credit Facilities (Outstanding Letters Of Credit And/Or Borrowings Of Citibank Holdings Credit Facility) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Line of Credit Facility [Line Items]
Commitment	$ 1,300,000,000	$ 1,300,000,000
In Use	127,000.000
Date of Expiry	9/30/2012
Holdings Revolving Credit One [Member]
Line of Credit Facility [Line Items]
Commitment	150,000,000	150,000,000
In Use		50,000,000
Date of Loan		12/16/2010
Date of Expiry		1/18/2011
Holdings Total Revolving Credit [Member]
Line of Credit Facility [Line Items]
In Use		50,000,000
Holdings Total Letters Of Credit [Member]
Line of Credit Facility [Line Items]
In Use	5,020,000	9,527,000
Date of Expiry	12/31/2012	12/31/2011
Holdings Total Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment	150,000,000	150,000,000
In Use	$ 5,020,000	$ 59,527,000