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Summary of Significant Accounting Policies - Pensions (Details)	12 Months Ended
	Dec. 31, 2020
PENSION AND POST EMPLOYMENT BENEFITS
Amortization period of differences between the expected long-term return on plan assets and the actual return	5 years

X

- Definition

This element represents the period over which differences between the expected long-term return on plan assets and the actual return will be amortized.

+ References

No definition available.

+ Details

Name:	abt_AmortizationPeriodOfDifferencesBetweenTheExpectedLongTermReturnOnPlanAssetsAndTheActualReturn
Namespace Prefix:	abt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_GeneralDiscussionOfPensionAndOtherPostretirementBenefitsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration