Debt Instrument, Outstanding Principal Amount Including Swap Amount

No definition available.

Name:	bhe_DebtInstrumentOutstandingPrincipalAmountIncludingSwapAmount
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

No definition available.

+ Details

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of an entity's outstanding debt that is designated as a hedged item in cash flow, fair value, or net investment hedge.

+ References

No definition available.

+ Details

Name:	us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Long-term Debt - EEGH (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Par value		$ 49,746
Total long-term debt	$ 49,866	49,762
Current portion of long-term debt	$ 1,839	1,265
Subsidiary debt
Debt Instrument [Line Items]
Par value		36,545
Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Par value		3,934
Variable-rate Senior Notes, due 2021 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Par value		$ 0
Interest rate on derivatives	100.00%
Fixed interest rate	3.46%
Basis spread on variable rate	0.60%
2.875% Senior Notes, due 2023 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		2.875%	2.875%
Par value		$ 250
3.55% Senior Notes, due 2023 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		3.55%	3.55%
Par value		$ 400
2.50% Senior Notes, due 2024 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		2.50%	2.50%
Par value		$ 600
3.60% Senior Notes, due 2024 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		3.60%	3.60%
Par value		$ 339
3.32% Senior Notes, due 2026 (€250) \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		3.32%	3.32%
Par value		$ 284	€ 250
Interest rate on derivatives		100.00%	100.00%
Fixed interest rate	3.32%	3.32%	3.32%
Outstanding principal amount including swap	$ 280	$ 280
3.00% Senior Notes, due 2029 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		3.00%	3.00%
Par value		$ 174
3.80% Senior Notes, due 2031 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		3.80%	3.80%
Par value		$ 150
4.80% Senior Notes, due 2043 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		4.80%	4.80%
Par value		$ 54
4.60% Senior Notes, due 2044 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		4.60%	4.60%
Par value		$ 56
3.90% Senior Notes, due 2049 \| Subsidiary debt \| EEGH
Debt Instrument [Line Items]
Stated rate		3.90%	3.90%
Par value		$ 27
3.60% Senior Notes, due 2024 \| Subsidiary debt \| EGTS
Debt Instrument [Line Items]
Stated rate		3.60%	3.60%
Par value				$ 111
3.00% Senior Notes, due 2029 \| Subsidiary debt \| EGTS
Debt Instrument [Line Items]
Stated rate		3.00%	3.00%
Par value				426
4.80% Senior Notes, due 2043 \| Subsidiary debt \| EGTS
Debt Instrument [Line Items]
Stated rate		4.80%	4.80%
Par value				346
4.60% Senior Notes, due 2044 \| Subsidiary debt \| EGTS
Debt Instrument [Line Items]
Stated rate		4.60%	4.60%
Par value				444
3.90% Senior Notes, due 2049 \| Subsidiary debt \| EGTS
Debt Instrument [Line Items]
Stated rate		3.90%	3.90%
Par value				$ 273
EEGH
Debt Instrument [Line Items]
Par value		$ 3,934
Total long-term debt	4,425	3,906
Current portion of long-term debt	500	0
Long-term debt	3,925	3,906
EEGH \| EEGH
Debt Instrument [Line Items]
Par value		3,934
Total long-term debt	4,425	3,906
EEGH \| Variable-rate Senior Notes, due 2021 \| EEGH
Debt Instrument [Line Items]
Par value		0
Total long-term debt	500	$ 0
EEGH \| 2.875% Senior Notes, due 2023 \| EEGH
Debt Instrument [Line Items]
Stated rate		2.875%	2.875%
Par value		$ 250
Total long-term debt	249	$ 250
EEGH \| 3.55% Senior Notes, due 2023 \| EEGH
Debt Instrument [Line Items]
Stated rate		3.55%	3.55%
Par value		$ 400
Total long-term debt	399	$ 399
EEGH \| 2.50% Senior Notes, due 2024 \| EEGH
Debt Instrument [Line Items]
Stated rate		2.50%	2.50%
Par value		$ 600
Total long-term debt	596	$ 597
EEGH \| 3.60% Senior Notes, due 2024 \| EEGH
Debt Instrument [Line Items]
Stated rate		3.60%	3.60%
Par value		$ 339
Total long-term debt	448	$ 338
EEGH \| 3.32% Senior Notes, due 2026 (€250) \| EEGH
Debt Instrument [Line Items]
Stated rate		3.32%	3.32%
Par value		$ 284	€ 250
Total long-term debt	304	$ 283
EEGH \| 3.00% Senior Notes, due 2029 \| EEGH
Debt Instrument [Line Items]
Stated rate		3.00%	3.00%
Par value		$ 174
Total long-term debt	594	$ 173
EEGH \| 3.80% Senior Notes, due 2031 \| EEGH
Debt Instrument [Line Items]
Stated rate		3.80%	3.80%
Par value		$ 150
Total long-term debt	150	$ 150
EEGH \| 4.80% Senior Notes, due 2043 \| EEGH
Debt Instrument [Line Items]
Stated rate		4.80%	4.80%
Par value		$ 54
Total long-term debt	395	$ 53
EEGH \| 4.60% Senior Notes, due 2044 \| EEGH
Debt Instrument [Line Items]
Stated rate		4.60%	4.60%
Par value		$ 56
Total long-term debt	493	$ 56
EEGH \| 3.90% Senior Notes, due 2049 \| EEGH
Debt Instrument [Line Items]
Stated rate		3.90%	3.90%
Par value		$ 27
Total long-term debt	$ 297	$ 26