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Information Relating to Individual Plans in Funded Status Table that have PBO in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Information relating to the individual plans in the funded status table above that have a PBO in excess of plan assets |  |
PBO | $ 5,875 | $ 5,523
Fair value of plan assets | $ 4,899 | $ 4,265

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- Definition Defined benefit plan pension plans with projected benefit obligations in excess of plan assets. + References No definition available. + Details
Name: | bax_DefinedBenefitPlanPensionPlansWithProjectedBenefitObligationsInExcessOfPlanAssetsAbstract
Namespace Prefix: | bax_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References No definition available. + Details
Name: | bax_DefinedBenefitPlanPensionPlansWithProjectedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
Namespace Prefix: | bax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with projected benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References No definition available. + Details
Name: | bax_DefinedBenefitPlanPensionPlansWithProjectedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
Namespace Prefix: | bax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant