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Fair Value Measurements Fair Value Measurements Using Significant Unobservable Inputs (Details) tons-per-year in Billions	3 Months Ended		6 Months Ended
	Mar. 31, 2016 USD ($) tons-per-year	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) tons-per-year	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) tons-per-year	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)
ASSETS
Commodity contract derivatives	$ 4,000,000		$ 4,000,000			$ 1,000,000
Liabilities
Commodity contract derivatives	$ 198,000,000		$ 198,000,000			$ 98,000,000
Maximum
ASSETS
Fair value measurements tons per year | tons-per-year	0.7		0.7			1.0
Price per ton	$ 76.25		$ 76.25			$ 103.41
Liabilities
Fair value measurements tons per year | tons-per-year	0.7		0.7			1.0
Price per ton	$ 76.25		$ 76.25			$ 103.41
Minimum
ASSETS
Fair value measurements tons per year | tons-per-year	0.4		0.4			0.8
Price per ton	$ 9.45		$ 9.45			$ 10.64
Liabilities
Fair value measurements tons per year | tons-per-year	0.4		0.4			0.8
Price per ton	$ 9.45		$ 9.45			$ 10.64
Fair Value, Inputs, Level 3
ASSETS
Commodity contract derivatives	0		0			0
Liabilities
Commodity contract derivatives	187,000,000		187,000,000			98,000,000
Commodity Contract Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance	(187,000,000)	$ (154,000,000)	(187,000,000)	$ (154,000,000)	$ (123,000,000)	$ (98,000,000)	$ (107,000,000)	$ (85,000,000)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Net unrealized gains (losses) deferred as regulatory assets and liabilities	$ (64,000,000)	$ (47,000,000)	$ (89,000,000)	$ (69,000,000)

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- Definition

The fair value as of the balance sheet date of firm obligations in physical commodity contracts (for example, agricultural products, metals and energy).

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The fair value measurement of tons per year used to determine fair value

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The price per ton used for the determination of fair value.

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Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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The fair value as of the balance sheet date of firm holdings in physical commodity contracts (for example, agricultural products, metals and energy). Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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