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Debt (Narrative) (Details) (Credit Facility [Member], USD $)
9 Months Ended
Sep. 30, 2014
item
Debt Instrument [Line Items]  
Unsecured revolving credit facility, borrowing capacity $ 2,000,000,000
Unsecured revolving credit facility, maturity date Dec. 01, 2018
Number of extension options 2
Extension term 1 year
Unsecured revolving credit facility, increase in current borrowing capacity potential $ 500,000,000
Debt percentage of adjusted book capital structure covenant 60.00%
Over LIBOR [Member]
 
Debt Instrument [Line Items]  
Basis points 1.375%