Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LitigationReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LitigationReserveNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Litigation Settlement, Payment Period

+ References

No definition available.

+ Details

Name:	wba_LitigationSettlementPaymentPeriod
Namespace Prefix:	wba_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=wba_WashtenawCountyEmployeesRetirementSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_SettledLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=wba_SettlementFrameworksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=wba_SettlementFrameworksWithSettlingStatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=wba_SettlementFrameworksWithSettlingTribesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=wba_ConsolidatedCasesInStateOfFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=wba_OhioCombinedCasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitment and contingencies (Details) - USD ($) $ in Millions				1 Months Ended
	Nov. 02, 2022	Jun. 29, 2022	May 05, 2022	Aug. 31, 2022	Feb. 28, 2023	Nov. 30, 2022
Loss Contingencies [Line Items]
Accrued litigation obligations				$ 551.0	$ 6,365.0
Washtenaw County Employees Retirement System \| Settled Litigation
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party		$ 105.0
Settlement Frameworks \| Pending Litigation
Loss Contingencies [Line Items]
Litigation settlement, period	6 years
Accrued litigation obligations	$ 754.0
Estimated litigation liability						$ 6,500.0
Settlement Frameworks \| Settled Litigation
Loss Contingencies [Line Items]
Accrued litigation obligations					6,400.0
Estimated litigation liability, current					1,000.0
Estimated litigation liability					$ 7,400.0
Settling States \| Pending Litigation
Loss Contingencies [Line Items]
Litigation settlement, period	15 years
Estimated litigation liability	$ 4,800.0
Settling Tribes \| Pending Litigation
Loss Contingencies [Line Items]
Litigation settlement, period	15 years
Estimated litigation liability	$ 155.0
Consolidated Cases in State of Florida \| Settled Litigation
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			$ 683.0
Litigation settlement, period			18 years
Accrued litigation obligations			$ 620.0
Estimated litigation liability, current			$ 63.0
Estimated litigation liability				683.0
Ohio Combined Cases \| Pending Litigation
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party				$ 650.6
Litigation settlement, period				15 years