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Retirement Benefits - Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($)
12 Months Ended
Sep. 24, 2018
Dec. 31, 2018
Feb. 18, 2019
Sep. 18, 2018
Sep. 05, 2018
Aug. 28, 2018
Dec. 31, 2017
Debt Instrument [Line Items]              
Increase in net assets $ 99,600,000 $ 99,600,000          
Elanco | Lilly              
Debt Instrument [Line Items]              
Common shares outstanding       100     293,290,000
Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount 2,000,000,000         $ 2,000,000,000  
Credit Facility | Revolving credit facility              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity 750,000,000       $ 750,000,000    
Credit Facility | Senior Unsecured Term Credit Facility              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity $ 500,000,000       $ 500,000,000    
Subsequent Event | Elanco | Lilly              
Debt Instrument [Line Items]              
Common shares outstanding     293,290,000        
Ownership percentage of outstanding Common stock     80.20%