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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Pland and Equipment with Useful Life Classification

The following table summarizes the components of the electric generation and distribution assets and other property, plant and equipment (in millions) with their estimated useful lives (in years). The amounts are stated net of all prior asset impairment losses recognized.

			December 31,
	Estimated Useful Life		2015				2014
Electric generation and distribution facilities	5 - 68		$	25,427			$	27,488
Other buildings	3 - 53		1,868				1,694
Furniture, fixtures and equipment	2 - 31		305				307
Other	1 - 50		891				970
Total electric generation and distribution assets and other			28,491				30,459
Accumulated depreciation			(9,449		)		(9,962		)
Net electric generation and distribution assets and other (1)			$	19,042			$	20,497

⁽¹⁾  Net electric generation and distribution assets and other include unamortized internal-use software costs of $83 million and $115 million as of December 31, 2015 and 2014, respectively

Interest Capitalized During Development And Construction

The following table summarizes depreciation expense (including the amortization of assets recorded under capital leases), amortization of internal-use software and interest capitalized during development and construction on qualifying assets for the periods indicated (in millions):

Year Ended December 31,		2015				2014				2013
Depreciation expense (including amortization of assets recorded under capital leases)		$	1,104			$	1,204			$	1,193
Amortization of internal-use software		29				33				36
Interest capitalized during development and construction		90				120				84

Net Asset Value Of Regulated And Non-Regulated Assets And Accumulated Depreciation

The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation in millions as of the periods indicated:

December 31,		2015				2014
Regulated generation, distribution assets and other, gross		$	11,818			$	13,103
Regulated accumulated depreciation		(4,351		)		(4,841		)
Regulated generation, distribution assets and other, net		7,467				8,262
Non-regulated generation, distribution assets and other, gross		16,673				17,356
Non-regulated accumulated depreciation		(5,098		)		(5,121		)
Non-regulated generation, distribution assets and other, net		11,575				12,235
Net electric generation, distribution assets and other		$	19,042			$	20,497

Schedule of Change in Asset Retirement Obligation

The next table presents amounts recognized related to asset retirement obligations in millions for the periods indicated:

		2015				2014
Balance at January 1		$	209			$	142
Additional liabilities incurred		43				51
Liabilities settled		(6		)		(11		)
Accretion expense		13				12
Change in estimated cash flows		(7		)		15
Other		(5		)		—
Balance at December 31		$	247			$	209

Schedule of Jointly Owned Utility Plants

DP&L's undivided ownership interest in such facilities at December 31, 2015 is as follows:

	DP&L Share			DP&L Investment
	Ownership			Gross Plant In Service				Accumulated Depreciation				Construction Work In Process
Production units:				($ in millions)
Conesville Unit 4	17	%		$	26			$	4			$	1
Killen Station	67	%		342				29				2
Miami Fort Units 7 and 8	36	%		219				32				6
Stuart Station	35	%		236				19				18
Zimmer Station	28	%		188				44				12
Transmission	various			43				8				—
Total				$	1,054			$	136			$	39

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Interest capitalized during development and construction of qualifying assets

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Summary of regulated and non-regulated generation and distribution facilities property, plant and equipment and associated accumulated depreciation

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph b
-Article 5

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Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 10.C)
-URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C

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