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Accumulated other comprehensive income (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and 2019 follows (in millions).

 

 

 

Unrealized

appreciation of

investments, net

 

 

Foreign

currency

translation

 

 

Defined benefit

pension plans

 

 

Other

 

 

Accumulated

other

comprehensive

income

 

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

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

First nine months of 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of year

 

$

370

 

 

$

(4,603

)

 

$

(816

)

 

$

34

 

 

$

(5,015

)

Other comprehensive income, net

 

 

137

 

 

 

(534

)

 

 

33

 

 

 

(29

)

 

 

(393

)

Balance at end of period

 

$

507

 

 

$

(5,137

)

 

$

(783

)

 

$

5

 

 

$

(5,408

)