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Debt And Other Credit Facilities (Consolidated amount of non-recourse project-finance debt of a VIE) (Details) - Jun. 30, 2015
£ in Millions, $ in Millions
GBP (£)
USD ($)
Class A 3.5% Index Linked Bonds [Member]    
Debt Instrument [Line Items]    
Guaranteed secured bonds, percentage 3.50% 3.50%
Class B 5.9% Fixed Rate Bonds [Member]    
Debt Instrument [Line Items]    
Guaranteed secured bonds, percentage 5.90% 5.90%
Minimum [Member]    
Debt Instrument [Line Items]    
Subordinated notes payable, interest rate 11.25%  
Maximum [Member]    
Debt Instrument [Line Items]    
Subordinated notes payable, interest rate 16.00%  
United Kingdom, Pounds | Class A 3.5% Index Linked Bonds [Member]    
Debt Instrument [Line Items]    
Secured bonds | £ £ 56.0  
United Kingdom, Pounds | Class B 5.9% Fixed Rate Bonds [Member]    
Debt Instrument [Line Items]    
Secured bonds | £ £ 16.7  
United States of America, Dollars | Class A 3.5% Index Linked Bonds [Member]    
Debt Instrument [Line Items]    
Secured bonds   $ 79
United States of America, Dollars | Class B 5.9% Fixed Rate Bonds [Member]    
Debt Instrument [Line Items]    
Secured bonds   $ 24