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Accumulated other comprehensive income (Tables)
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of accumulated other comprehensive income

A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire Hathaway shareholders for the nine months ending September 30, 2021 and 2020 follows (in millions).

 

 

 

Unrealized

appreciation of

investments, net

 

 

Foreign

currency

translation

 

 

Defined benefit

pension plans

 

 

Other

 

 

Accumulated

other

comprehensive

income

 

First nine months of 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

 

$

536

 

 

$

(3,082

)

 

$

(1,645

)

 

$

(52

)

 

$

(4,243

)

Other comprehensive income, net

 

 

(126

)

 

 

(619

)

 

 

112

 

 

 

42

 

 

 

(591

)

Balance at end of period

 

$

410

 

 

$

(3,701

)

 

$

(1,533

)

 

$

(10

)

 

$

(4,834

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

First nine months of 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

 

$

481

 

 

$

(4,346

)

 

$

(1,369

)

 

$

(9

)

 

$

(5,243

)

Other comprehensive income, net

 

 

29

 

 

 

(28

)

 

 

67

 

 

 

(15

)

 

 

53

 

Balance at end of period

 

$

510

 

 

$

(4,374

)

 

$

(1,302

)

 

$

(24

)

 

$

(5,190

)