XML 146 R127.htm IDEA: XBRL DOCUMENT
v3.20.4

Segment and Geographic Information - Revenues as a Percent of Total Revenues by Geographic Region (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 100.00% | 100.00% | 100.00%
U.S. |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 56.20% | 53.60% | 47.80%
Japan |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 13.30% | 15.40% | 10.10%
Taiwan |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 7.70% | 6.00% | 8.10%
Australia |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 6.90% | 5.80% | 6.60%
China |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 3.80% | 3.80% | 5.90%
India |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 2.60% | 1.20% | 6.20%
Vietnam |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 2.40% | 2.00% | 0.50%
South Korea |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 0.80% | 2.90% | 3.10%
Other |  |  |
Revenues as a Percent of Total Revenues by Geographic Region [Line Items] |  |  |
Segment Reporting, Revenue Percentage | 6.30% | 9.30% | 11.70%

X
- Definition [Line Items] for Revenues as a Percent of Total Revenues by Geographic Region [Table] + References No definition available. + Details
Name: | btu_RevenuesasaPercentofTotalRevenuesbyGeographicRegionLineItems
Namespace Prefix: | btu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Segment Reporting, Revenue Percentage + References No definition available. + Details
Name: | btu_SegmentReportingRevenuePercentage
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_JP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_TW
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_AU
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_IN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_VN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_KP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=btu_OtherRegionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |