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Leases - Amounts and Location of Operating Lease ROU Assets And Lease Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets and Liabilities, Lessee    
Operating Lease - ROU Asset $ 1,101 $ 934
Operating Lease, Assets (Balance Sheet Location) abt:DeferredIncomeTaxesandOtherAssets abt:DeferredIncomeTaxesandOtherAssets
Operating Lease Liability - Current $ 241 $ 205
Operating Lease, Current Liabilities (Balance Sheet Location) us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:OtherAccruedLiabilitiesCurrent
Operating Lease Liability - Non-Current $ 902 $ 755
Operating Lease, Non-current Liabilities (Balance Sheet Location) abt:Post-EmploymentObligationsOtherLong-TermLiabilities abt:Post-EmploymentObligationsOtherLong-TermLiabilities
Present value of lease liabilities $ 1,143 $ 960