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Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Proceeds from sales | $ 27.6 | $ 35.2
Realized gross gains on sales | 0.2 | 0.1
Realized gross losses on sales | $ 0.7 | $ 0.8

X
- Definition Available for Sale Securities and Equity Securities, FV-NI, Realized Gain + References No definition available. + Details
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Namespace Prefix: | lly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Available for sale Securities and Equity Securities, FV-NI, Realized Loss + References No definition available. + Details
Name: | lly_AvailableforsaleSecuritiesandEquitySecuritiesFVNIRealizedLoss
Namespace Prefix: | lly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from Sale of Equity and Available for Sale Securities + References No definition available. + Details
Name: | lly_ProceedsfromSaleofEquityandAvailableforSaleSecurities
Namespace Prefix: | lly_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration