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Securities In An Unrealized Loss Position Securities in an Unrealized Loss Position (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Number of securities 28
Preferred Stock [Member]
 
Number of securities 5
Aggregate fair value 47
Gross unrealized loss 3
Number of investment-grade,. available for sale equity securities, continous unrealized loss 4
Non-investment grade aggregate fair value 21
Non-investment grade gross unrealized loss 2
Common Stock [Member]
 
Number of securities 3
Aggregate fair value 35
Gross unrealized loss 0