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Borrowings (Details) (USD $)
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3 Months Ended | 12 Months Ended | ||||
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Aug. 31, 2014
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Feb. 28, 2014
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| Commercial Paper | $ 2,680,600,000us-gaap_CommercialPaper | $ 0us-gaap_CommercialPaper | ||||
| Short-term borrowings and current maturities of long-term debt | 2,688,700,000us-gaap_DebtCurrent | 1,012,600,000us-gaap_DebtCurrent | ||||
| Short-term Debt, Weighted Average Interest Rate | 0.18%us-gaap_ShortTermDebtWeightedAverageInterestRate | |||||
| Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 1.95%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum | |||||
| Repayments of Long-term Debt | 1,000,000,000us-gaap_RepaymentsOfLongTermDebt | 1,034,800,000us-gaap_RepaymentsOfLongTermDebt | 10,500,000us-gaap_RepaymentsOfLongTermDebt | 1,511,100,000us-gaap_RepaymentsOfLongTermDebt | ||
| Notes Payable | 4,887,300,000us-gaap_NotesPayable | 4,887,300,000us-gaap_NotesPayable | ||||
| Other Notes Payable | 33,100,000us-gaap_OtherNotesPayable | 27,100,000us-gaap_OtherNotesPayable | ||||
| Long-term Debt, Fair Value Adjustment | 455,400,000lly_LongTermDebtFairValueAdjustment | 298,500,000lly_LongTermDebtFairValueAdjustment | ||||
| Debt, Long-term and Short-term, Combined Amount | 8,056,400,000us-gaap_DebtLongtermAndShorttermCombinedAmount | 5,212,900,000us-gaap_DebtLongtermAndShorttermCombinedAmount | ||||
| Long-term debt | 5,367,700,000us-gaap_LongTermDebtNoncurrent | 4,200,300,000us-gaap_LongTermDebtNoncurrent | ||||
| Description of Derivative Activity Volume Percent | 55.00%lly_DescriptionOfDerivativeActivityVolumePercent | |||||
| Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 8,100,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths | |||||
| Long-term Debt, Maturities, Repayments of Principal in Year Two | 208,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo | |||||
| Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,010,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree | |||||
| Long-term Debt, Maturities, Repayments of Principal in Year Four | 203,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour | |||||
| Long-term Debt, Maturities, Repayments of Principal in Year Five | 601,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive | |||||
| Line of Credit Facility, Remaining Borrowing Capacity | 3,310,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity | |||||
| Line of Credit Facility, Amount Outstanding | 0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding | |||||
| Interest Paid, Net | 140,400,000us-gaap_InterestPaidNet | 139,700,000us-gaap_InterestPaidNet | 171,900,000us-gaap_InterestPaidNet | |||
| Debt Instrument, Interest Rate, Effective Percentage | 3.69%us-gaap_DebtInstrumentInterestRateEffectivePercentage | 3.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage | ||||
| Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.13%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum | |||||
| Maturity Date, 2019 [Member] | ||||||
| Debt Instrument, Interest Rate, Stated Percentage | 1.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = lly_MaturityDate2019Member |
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| Long-term Debt | 600,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentRedemptionPeriodAxis = lly_MaturityDate2019Member |
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| Line of Credit Facility, Maximum Borrowing Capacity | 1,200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentRedemptionPeriodAxis = lly_MaturityDate2019Member |
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| Maturity Date, 2015 [Member] | ||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentRedemptionPeriodAxis = lly_MaturityDate2015Member |
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| Maturity Date, 2044 [Member] | ||||||
| Debt Instrument, Interest Rate, Stated Percentage | 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentRedemptionPeriodAxis = lly_MaturityDate2044Member |
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| Long-term Debt | $ 400,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentRedemptionPeriodAxis = lly_MaturityDate2044Member |
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- Definition
Label: Description of Derivative Activity Volume Element ID: us-gaap_DescriptionOfDerivativeActivityVolume Balance Type: na Data Type: PERCENT Period Type: duration --------------------------------------------------------------------- Definition: Information that would enable users to understand the volume of the entity's derivative activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 -Subparagraph 2 No definition available.
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- Definition
Fair value adjustment to carrying value of long term debt to arrive at total fair value. No definition available.
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- Definition
Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Maximum contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Minimum contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Represents the aggregate of total long-term debt, including current maturities and short-term debt. No definition available.
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- Definition
The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of the amount outstanding under the credit facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Including the current and noncurrent portions, the carrying value of notes payable which were initially due after one year or beyond the normal operating cycle, if longer, and which are not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average interest rate of short-term debt outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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