XML 82 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
Debt and Other Obligations Debt Outstanding (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Mar. 31, 2018
Short-term debt    
Short-term debt, net $ 1,998 $ 1,998
Current maturities of power bonds 1,728 2,031
Current maturities of long-term debt of variable interest entities 36 37
Current maturities of notes payable 53 46
Total current debt outstanding, net 3,815 4,112
Long-term debt    
Long-term power bonds [1] 20,357 20,391
Long-term debt of variable interest entities 1,175 1,156
Long-term notes payable 69 47
Unamortized discounts, premiums, issues costs, and other (163) (160)
Total long-term debt, net 21,438 21,434
Total outstanding debt 25,253 25,546
Net exchange gain from currency transactions $ 125 $ 87
[1] Includes net exchange gain from currency transactions of $87 million and $125 million at March 31, 2018, and September 30, 2017, respectively.