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Document and Entity Information
Jun. 17, 2023
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001111711
Document Type 8-K
Document Period End Date Jun. 17, 2023
Entity Registrant Name NiSource Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-16189
Entity Tax Identification Number 35-2108964
Entity Address, Address Line One 801 East 86th Avenue
Entity Address, City or Town Merrillville
Entity Address, State or Province IN
Entity Address, Postal Zip Code 46410
City Area Code (877)
Local Phone Number 647-5990
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol NI
Security Exchange Name NYSE
Series B Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/1,000th ownership interest in a share of 6.50% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual
Trading Symbol NI PR B
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Series A Corporate Units
Trading Symbol NIMC
Security Exchange Name NYSE