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Regulatory Assets and Liabilities (Tables)

3 Months Ended

Dec. 31, 2018

Revenue from External Customer [Line Items]

Revenue from External Customers by Products and Services [Table Text Block]

Operating Revenues by Customer Type Three Months Ended December 31 (in millions)
	2018				2017
Revenue from sales of electricity
Local power companies	$	2,468			$	2,316
Industries directly served	184				165
Federal agencies and other	29				29
Revenue capitalized during pre-commercial plant operations(1)	—				(1		)
Revenue from sales of electricity	2,681				2,509
Other revenues	44				40
Total operating revenues	$	2,725			$	2,549

Regulatory Assets and Liabilities

Components of regulatory assets and regulatory liabilities are summarized in the table below.

Regulatory Assets and Liabilities
	At December 31, 2018				At September 30, 2018
Current regulatory assets
Gallatin coal combustion residual facilities	$	29			$	38
Unrealized losses on interest rate derivatives	75				73
Environmental agreements	1				3
Unrealized losses on commodity contracts	5				4
Environmental cleanup costs – Kingston ash spill	195				266
Fuel cost adjustment receivable	75				30
Total current regulatory assets	380				414
Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	3,059				3,119
Non-nuclear decommissioning costs	1,086				1,019
Nuclear decommissioning costs	1,006				784
Gallatin coal combustion residual facilities	866				861
Unrealized losses on interest rate derivatives	800				692
Environmental agreements	12				11
Unrealized losses on commodity contracts	5				8
Other non-current regulatory assets	128				118
Total non-current regulatory assets	6,962				6,612
Total regulatory assets	$	7,342			$	7,026
Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	144			$	146
Unrealized gains on commodity derivatives	50				41
Total current regulatory liabilities	194				187
Non-current regulatory liabilities
Deferred other post-retirement benefits cost	68				73
Unrealized gains on commodity derivatives	27				31
Total non-current regulatory liabilities	95				104
Total regulatory liabilities	$	289			$	291

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- Definition

Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet or that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Regulatory liabilities can result from obligations to make refunds to customers or deferral of gains that will be credited to customers in future periods

+ References

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- 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

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- Definition

Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599

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