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Benefit Plans Expected Amortization of Regulatory Assets in Next Fiscal Year (Details) $ in Millions	12 Months Ended
	Sep. 30, 2018 USD ($)
Defined Benefit Plan Disclosure
Prior service cost (credit)	$ (123)
Net actuarial loss	331
Pension Benefits
Defined Benefit Plan Disclosure
Prior service cost (credit)	(99)
Net actuarial loss	327
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Prior service cost (credit)	(24)
Net actuarial loss	$ 4

X

- Definition

The amounts in regulatory assets related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

No definition available.

+ Details

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X

- Definition

The amounts in regulatory assets related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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