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Trusted Preferred Securities and Junior Subordinated Debentures (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Jun. 29, 2007
Trust One [Member]
Jun. 27, 2002
Trust One [Member]
Jun. 30, 2007
Trust Two [Member]
Dec. 31, 2013
Trust Two [Member]
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from Issuance of Trust Preferred Securities   $ 15 $ 25  
Maturity Period of Trust Preferred Securities   30 years 30 years  
Redemption amount of trust preferred securities issued $ 15      
Debt Instrument, Description of Variable Rate Basis       1.56%
Debt Instrument, Interest Rate at Period End       1.81%