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Debt and Other Obligations Debt and Other Obligations - General (Details)
$ in Billions
 12 Months Ended
Sep. 30, 2016
USD ($)
tests
Types_of_bonds
Debt Instrument  
Debt ceiling | $ $ 30.0
Number of types of bonds outstanding | Types_of_bonds 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 | tests 2
Time period for meeting the bondholder protection test 5 years