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Transfers Of Financial Assets (Schedule Of Gross And Net Receivables Transferred As Well As Short-Term Borrowings Related To The Securitization Transactions) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Gross Receivables	$ 623.0	$ 618.3
Less: Receivables not transferred	184.0	308.3
Net receivables transferred	439.0	310.0
Accounts receivable securitization facility borrowings	$ 439.0	$ 310.0

X

- Definition

Trade receivables available for transfer

+ References

No definition available.

+ Details

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Namespace Prefix:	ni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Trade receivables not transferred

+ References

No definition available.

+ Details

Name:	ni_TradeReceivablesNotTransferred
Namespace Prefix:	ni_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Trade receivables transferred, net

+ References

No definition available.

+ Details

Name:	ni_TradeReceivablesTransferredNet
Namespace Prefix:	ni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant