| **Commitments and Contingencies - (Details) - USD ($) $ in Millions**  | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------|----------------|----------------|
||
| **Loss Contingencies [Line Items]**                                    |           |           |   |   |   |
| Claims amount for terminated contract                                  |           | $ 67.9         |   |   |   |
| Additional claim amount for terminated contract                        |           | 57.0           |   |   |   |
| Breach of contract counter suit amount                                 |           | 182.0          |   |   |   |
| Litigation Settlement, Expense                                         |           | $ 5.0          |   |   |   |
| Gain (Loss) Related to Litigation Settlement                           | $ 0.0          |           | $ 0.0 | $ 13.0 | $ (62.0) |
| Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 1,200.0        |           |   | $ 1,200.0 |   |
| Natural Gas Storage System in Northern Germany [Member]                |           |           |   |   |   |
| **Loss Contingencies [Line Items]**                                    |           |           |   |   |   |
| Loss Contingency, Damages Sought, Value                                | $ 170.0        |           |   |   |   |
| Loss Contingency, Damages Sought, interest rate                        | 5.00%          |           |   | 5.00% |   |
| Construction and Engineering Contract in Europe [Member]               |           |           |   |   |   |
| **Loss Contingencies [Line Items]**                                    |           |           |   |   |   |
| Loss Contingency, Damages Sought, Value                                | $ 369.0        |           |   |   |   |

| X                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Additional claim amount for terminated contract
+ References
No definition available.
+ Details**Name:**bhi_Additionalclaimamountforterminatedcontract**Namespace Prefix:**bhi_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Alleged damages by customer - interest rate
+ References
No definition available.
+ Details**Name:**bhi_Allegeddamagesbycustomerinterestrate**Namespace Prefix:**bhi_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Breach of contract counter suit amount
+ References
No definition available.
+ Details**Name:**bhi_Breachofcontractcountersuitamount**Namespace Prefix:**bhi_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Additional claims amount for terminated contract
+ References
No definition available.
+ Details**Name:**bhi_Claimsamountforterminatedcontract**Namespace Prefix:**bhi_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.
+ References
No definition available.
+ Details**Name:**us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349
+ Details**Name:**us-gaap_GainLossRelatedToLitigationSettlement**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.
+ References
No definition available.
+ Details**Name:**us-gaap_LitigationSettlementExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| 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_LossContingenciesLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The value (monetary amount) of the award the plaintiff seeks in the legal matter.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349
+ Details**Name:**us-gaap_LossContingencyDamagesSoughtValue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LitigationCaseAxis=bhi_NaturalGasStorageSysteminNorthernGermanyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LitigationCaseAxis=bhi_ConstructionandEngineeringContractinEuropeMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |