Income Taxes - Operating Loss And Credit Carryforwards (Details) $ in Millions	Dec. 31, 2025 USD ($)
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 2,300.0
Tax credit carryforwards	54.5
Federal \| Expire in 2026 - 2030
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	400.0
Tax credit carryforwards	6.3
Federal \| Expire in 2031 - 2035
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,000.0
Tax credit carryforwards	11.7
Federal \| Expire beginning in 2035
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	200.0
Tax credit carryforwards	36.5
Federal \| Carryforward indefinitely
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	600.0
Tax credit carryforwards	0.0
California
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,500.0
Tax credit carryforwards	21.8
California \| Expire in 2026 - 2030
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	300.0
Tax credit carryforwards	0.0
California \| Expire in 2031 - 2035
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	600.0
Tax credit carryforwards	0.0
California \| Expire beginning in 2035
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	500.0
Tax credit carryforwards	0.0
California \| Carryforward indefinitely
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
Tax credit carryforwards	$ 21.8

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

+ Details

Name:	us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

+ Details

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TaxPeriodAxis=be_ExpirationNextFiveYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TaxPeriodAxis=be_ExpirationAfterFiveYearsToTenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TaxPeriodAxis=be_ExpirationAfterTenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TaxPeriodAxis=be_NoExpirationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: