XML 41 R28.htm IDEA: XBRL DOCUMENT
v3.21.2

Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented (Policies) | 6 Months Ended
--- | ---
Jun. 30, 2021
Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented [Abstract] |
Corporate Hedging | From time to time, the Company may utilize various types of derivative instruments to manage its exposure to risks in the normal course of business, including (1) foreign currency exchange rate risk and the variability of cash flows associated with forecasted Australian dollar expenditures made in its Australian mining platform, (2) price risk of fluctuating coal prices related to forecasted sales or purchases of coal, or changes in the fair value of a fixed price physical sales contract, (3) price risk and the variability of cash flows related to forecasted diesel fuel purchased for use in its operations and (4) interest rate risk on long-term debt. These risk management activities are actively monitored for compliance with the Company’s risk management policies.
Corporate Hedging - Coal Trading | The Company’s risk management function, which is independent of the Company’s coal trading function, is responsible for valuation policies and procedures, with oversight from executive management. The fair value of the Company’s coal derivative assets and liabilities reflects adjustments for credit risk. The Company’s exposure is substantially with electric utilities, energy marketers, steel producers and nonfinancial trading houses.
Fair Value, Assets, Transfers Between Levels | The Company’s policy is to value all transfers between levels using the beginning of period valuation.

X
- Definition Corporate Hedging - Coal Trading [Policy Text Block] + References No definition available. + Details
Name: | btu_CorporateHedgingCoalTradingPolicyTextBlock
Namespace Prefix: | btu_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Corporate Hedging [Policy Text Block] + References No definition available. + Details
Name: | btu_CorporateHedgingPolicyTextBlock
Namespace Prefix: | btu_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value, Assets, Transfers Between Levels [Policy Text Block] + References No definition available. + Details
Name: | btu_FairValueAssetsTransfersBetweenLevelsPolicyTextBlock
Namespace Prefix: | btu_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented [Abstract] + References No definition available. + Details
Name: | btu_NewlyAdoptedAccountingStandardsandAccountingStandardsNotYetImplementedAbstract
Namespace Prefix: | btu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration