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CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL (UNAUDITED) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Power Program Appropriation Investment	$ 258,000,000		$ 258,000,000			$ 258,000,000
Power Program Retained Earnings	11,271,000,000		11,271,000,000			10,823,000,000
Nonpower Programs Appropriation Investment, Net	552,000,000		552,000,000			556,000,000
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges	(102,000,000)		(102,000,000)			(12,000,000)
Total Proprietary Capital	11,979,000,000	$ 10,919,000,000	11,979,000,000	$ 10,919,000,000	$ 11,832,000,000	11,625,000,000	$ 10,670,000,000	$ 10,283,000,000
Net income (loss)	255,000,000	241,000,000	447,000,000	664,000,000
Total other comprehensive income (loss)	(107,000,000)	9,000,000	(90,000,000)	(25,000,000)
Return on power program appropriation investment	(1,000,000)	(1,000,000)	(3,000,000)	(3,000,000)
Power Program Appropriation Investment
Power Program Appropriation Investment	258,000,000	258,000,000	258,000,000	258,000,000	258,000,000	258,000,000	258,000,000	258,000,000
Net income (loss)	0	0	0	0
Total other comprehensive income (loss)	0	0	0	0
Return on power program appropriation investment	0	0	0	0
Power Program Retained Earnings
Power Program Retained Earnings	11,271,000,000	10,069,000,000	11,271,000,000	10,069,000,000	11,015,000,000	10,823,000,000	9,827,000,000	9,404,000,000
Net income (loss)	256,716,543	243,000,000	451,290,418	668,000,000
Total other comprehensive income (loss)	0	0	0	0
Return on power program appropriation investment	573,266	(1,000,000)	3,146,539	(3,000,000)
Nonpower Programs Appropriation Investment, Net
Nonpower Programs Appropriation Investment, Net	552,000,000	560,000,000	552,000,000	560,000,000	554,000,000	556,000,000	562,000,000	564,000,000
Net income (loss)	(1,914,699)	(2,000,000)	(3,850,703)	(4,000,000)
Total other comprehensive income (loss)	0	0	0	0
Return on power program appropriation investment	0	0	0	0
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) from Net Gains (Losses) on Cash Flow Hedges	(102,000,000)	32,000,000	(102,000,000)	32,000,000	$ 5,000,000	$ (12,000,000)	$ 23,000,000	$ 57,000,000
Net income (loss)	0	0	0	0
Total other comprehensive income (loss)	(107,000,000)	9,000,000	(90,000,000)	(25,000,000)
Return on power program appropriation investment	$ 0	$ 0	$ 0	$ 0

X

- Definition

Appropriated funds advanced and property transferred to/from the reporting entity by the U.S. government for programs (exclusive of the power program) and program income received offset by expenses incurred in the administration of these programs.

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Balance of appropriated funds advanced and property transferred to/from the reporting entity by the U.S. government as an investment in its power program.

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The cumulative amount of the reporting entity's undistributed earnings or deficit from power program activities less amounts returned to the U.S. government as a return on its appropriation investment in the power program.

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