XML 157 R139.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Supplemental Guarantor/Non-Guarantor Financial Information (Details Textuals) | 12 Months Ended
--- | ---
Dec. 31, 2016
Supplemental Guarantor Non Guarantor Financial Information [Abstract] |
Percent of ownership of certain U.S. subsidiaries that fully and unconditionally guarantee the Senior Notes | 100.00%

X
- Definition Percent of ownership of certain U.S. subsidiaries that fully and unconditionally guarantee the Senior Notes + References No definition available. + Details
Name: | btu_PercentofownershipofcertainU.S.subsidiariesthatfullyandunconditionallyguaranteetheSeniorNotes
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Supplemental Guarantor/Non-Guarantor Financial Information. + References No definition available. + Details
Name: | btu_SupplementalGuarantorNonGuarantorFinancialInformationAbstract
Namespace Prefix: | btu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration