v3.25.2
Business segment data - Narrative (Detail)
6 Months Ended
Jun. 30, 2025
Activity
Segment Reporting [Abstract]
Number of insurance segment activities
2
X
- Definition
Number of insurance segment activities
+ References
No definition available.
+ Details
Name:
brka_NumberOfInsuranceSegmentActivities
Namespace Prefix:
brka_
Data Type:
xbrli:integerItemType
Balance Type:
na
Period Type:
duration
X
- References
No definition available.
+ Details
Name:
us-gaap_SegmentReportingAbstract
Namespace Prefix:
us-gaap_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration