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Subsequent Event Narrative (Details) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Oct. 15, 2013
Medium-term Notes [Member]
Oct. 28, 2013
Unsecured Debt [Member]
Subsequent Event [Line Items]    
Repayments of Debt $ 200  
Debt Instrument, Interest Rate, Stated Percentage 5.20%  
Proceeds from Issuance of Senior Long-term Debt   175
Debt Instrument, Term   5 years
Debt Instrument, Unused Borrowing Capacity, Amount   $ 75
Debt Instrument, Basis Spread on Variable Rate   1.50%
Debt Instrument, Interest Rate During Period   1.69%