Document and Entity Information
Feb. 20, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 20, 2020
Entity Registrant Name Humana Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-05975
Entity Tax Identification Number 61-0647538
Entity Address, Address Line One 500 W. Main Street
Entity Address, City or Town Louisville
Entity Address, State or Province KY
Entity Address, Postal Zip Code 40202
City Area Code 502
Local Phone Number 580-1000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000049071
Title of 12(b) Security Common Stock
Trading Symbol HUM
Security Exchange Name NYSE