Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 42, 45

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Name:	us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Merger (Details 3) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Total intangible assets recorded
Intangible assets	$ 910	$ 256
Purchase contract assets
Total intangible assets recorded
Intangible assets	234
Purchase contract assets \| OVEC
Total intangible assets recorded
Intangible assets	53
NUG \| Purchase contract assets
Total intangible assets recorded
Intangible assets	181
Energy contracts \| Intangible Assets
Total intangible assets recorded
Intangible assets	85
Intangible Assets
Total intangible assets recorded
Intangible assets	676
Intangible Assets \| FES customer intangible assets
Total intangible assets recorded
Intangible assets	126
Coal contracts \| Intangible Assets
Total intangible assets recorded
Intangible assets	$ 465