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Accumulated other comprehensive income
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Accumulated other comprehensive income

Note 20. Accumulated other comprehensive income

A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire shareholders follows (in millions).

 

Unrealized investment gains (losses)

 

Foreign currency translation

 

Long-duration insurance contracts

 

Defined benefit pension plans

 

Other

 

Total

 

2025

 

 

 

 

 

 

 

 

 

 

 

 

Balance at the beginning of the year

$

117

 

$

(7,039

)

$

2,015

 

$

1,148

 

$

175

 

$

(3,584

)

Other comprehensive income

 

99

 

 

1,207

 

 

(120

)

 

(102

)

 

(23

)

 

1,061

 

Balance at September 30, 2025

$

216

 

$

(5,832

)

$

1,895

 

$

1,046

 

$

152

 

$

(2,523

)

 

 

 

 

 

 

 

 

 

 

 

 

2024

 

 

 

 

 

 

 

 

 

 

 

Balance at the beginning of the year

$

190

 

$

(5,393

)

$

1,353

 

$

(97

)

$

184

 

$

(3,763

)

Other comprehensive income

 

81

 

 

78

 

 

(10

)

 

(44

)

 

(34

)

 

71

 

Balance at September 30, 2024

$

271

 

$

(5,315

)

$

1,343

 

$

(141

)

$

150

 

$

(3,692

)