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Debt and Other Obligations Debt and Other Obligations - General (Details) (USD $)
In Billions, unless otherwise specified
Sep. 30, 2015
Sep. 30, 2013
tests
Types_of_bonds
Sep. 30, 2010
Debt Instrument      
Debt ceiling   $ 30.0  
Number of types of bonds outstanding   2  
Power bonds years to maturity - low end of range   1 year  
Power bonds years to maturity - high end of range   50 years  
Discount notes years to maturity - high end of range   1 year  
Number of bond tests   2  
Time period for meeting the bondholder protection test 5 years 5 years 5 years