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v3.22.2

Property, Plant, Equipment and Mine Development - Narrative (Details) | Jun. 30, 2022 USD ($)
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Impaired Long-Lived Assets Held and Used [Line Items] |
At-risk assets | $ 500,000,000
Other US Mining Operations |
Impaired Long-Lived Assets Held and Used [Line Items] |
At-risk assets | $ 0

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- Definition At-risk assets + References No definition available. + Details
Name: | btu_Atriskassets
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_ImpairedLongLivedAssetsHeldAndUsedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | btu_MineLocationAxis=btu_OtherUSMiningOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |