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Investment gains/losses (Tables)
 12 Months Ended
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]  
Summary of investment gains and losses

Investment gains/losses for each of the three years ending December 31, 2019 are summarized below (in millions).

 

 

 

2019

 

 

2018

 

 

2017

 

Equity securities:

 

 

 

 

 

 

 

 

 

 

 

 

Unrealized investment gains/losses on securities held at the end of

   the period

 

$

69,581

 

 

$

(22,729

)

 

$

—

 

Investment gains/losses during the year on securities sold

 

 

1,585

 

 

 

291

 

 

 

—

 

Gross realized gains

 

 

—

 

 

 

—

 

 

 

2,237

 

Gross realized losses

 

 

—

 

 

 

—

 

 

 

(919

)

 

 

 

71,166

 

 

 

(22,438

)

 

 

1,318

 

Fixed maturity securities:

 

 

 

 

 

 

 

 

 

 

 

 

Gross realized gains

 

 

87

 

 

 

480

 

 

 

103

 

Gross realized losses

 

 

(25

)

 

 

(227

)

 

 

(22

)

Other

 

 

(105

)

 

 

30

 

 

 

11

 

 

 

$

71,123

 

 

$

(22,155

)

 

$

1,410