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1114 - Disclosure - Pension plans - Net periodic pension expense (Detail)
(http://www.berkshirehathaway.com/taxonomy/role/DisclosurePensionPlansNetPeriodicPensionExpense)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001067983 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Components of net periodic pension expense
 
 
 
Service cost
282,000,000  
266,000,000  
230,000,000  
Interest cost
691,000,000  
591,000,000  
629,000,000  
Expected return on plan assets
(908,000,000) 
(782,000,000) 
(772,000,000) 
Amortization of actuarial losses and other
148,000,000  
179,000,000  
102,000,000  
Net pension expense
213,000,000  
 
254,000,000  
 
189,000,000