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Investments
3 Months Ended
Mar. 31, 2023
Investments [Abstract]  
Investment Investments
The following table provides amortized cost, gross unrealized gains, gross unrealized losses and fair value for our fixed-maturity securities:
(Dollars in millions)Amortized
cost
Gross unrealizedFair value
At March 31, 2023gainslosses
Fixed-maturity securities:    
Corporate $7,568 $49 $526 $7,091 
States, municipalities and political subdivisions4,933 42 226 4,749 
Government-sponsored enterprises 390 1 4 387 
Commercial mortgage-backed241  16 225 
United States government199  4 195 
Foreign government31   31 
Total$13,362 $92 $776 $12,678 
At December 31, 2022    
Fixed-maturity securities:    
Corporate $7,412 $37 $580 $6,869 
States, municipalities and political subdivisions4,901 24 303 4,622 
Government-sponsored enterprises186 — 183 
Commercial mortgage-backed 250 — 16 234 
United States government196 — 191 
Foreign government34 — 33 
Total$12,979 $61 $908 $12,132 
 
The net unrealized investment losses in our fixed-maturity portfolio at March 31, 2023, are primarily due to an increase in U.S. Treasury yields and a widening of corporate credit spreads. Our commercial mortgage-backed securities had an average rating of Aa2/AA- at March 31, 2023, and December 31, 2022.
The table below provides fair values and gross unrealized losses by investment category and by the duration of the securities' continuous unrealized loss positions:
(Dollars in millions)Less than 12 months12 months or moreTotal
At March 31, 2023Fair
value
Unrealized
losses
Fair
value
Unrealized
losses
Fair
value
Unrealized
losses
Fixed-maturity securities:      
Corporate $3,910 $158 $2,273 $368 $6,183 $526 
States, municipalities and political subdivisions1,287 48 890 178 2,177 226 
Government-sponsored enterprises263 3 7 1 270 4 
Commercial mortgage-backed107 5 116 11 223 16 
United States government121 1 52 3 173 4 
Foreign government10  2  12  
Total$5,698 $215 $3,340 $561 $9,038 $776 
At December 31, 2022      
Fixed-maturity securities:      
Corporate $5,651 $412 $661 $168 $6,312 $580 
States, municipalities and political subdivisions2,600 274 77 29 2,677 303 
Government-sponsored enterprises123 — 126 
Commercial mortgage-backed215 13 14 229 16 
United States government146 41 187 
Foreign government25 — 29 
Total$8,760 $706 $800 $202 $9,560 $908 

Contractual maturity dates for fixed-maturities securities were:
(Dollars in millions)Amortized
cost
Fair
value
% of fair
value
At March 31, 2023
Maturity dates:   
Due in one year or less$728 $725 5.7 %
Due after one year through five years4,139 4,003 31.6 
Due after five years through ten years3,583 3,447 27.2 
Due after ten years4,912 4,503 35.5 
Total$13,362 $12,678 100.0 %

Actual maturities may differ from contractual maturities when there is a right to call or prepay obligations with or without call or prepayment penalties.
The following table provides investment income and investment gains and losses, net:
(Dollars in millions)Three months ended March 31,
20232022
Investment income:
Interest$140 $123 
Dividends66 65 
Other 7 
Total213 189 
Less investment expenses3 
Total$210 $185 
Investment gains and losses, net:  
Equity securities:  
Investment gains and losses on securities sold, net$(1)$
Unrealized gains and losses on securities still held, net106 (683)
Subtotal105 (675)
Fixed-maturity securities:  
Gross realized gains1 
Gross realized losses(1)(1)
Subtotal 
Other1 
Total$106 $(666)
 
The fair value of our equity portfolio was $9.967 billion and $9.841 billion at March 31, 2023, and December 31, 2022, respectively. Apple Inc. (Nasdaq:AAPL), an equity holding, was our largest single investment holding with a fair value of $758 million and $597 million, which was 7.9% and 6.3% of our publicly traded common equities portfolio and 3.3% and 2.7% of the total investment portfolio at March 31, 2023, and December 31, 2022, respectively.

The allowance for credit losses was $1 million at both March 31, 2023, and December 31, 2022. Changes in the allowance for credit losses were less than $1 million for both the three months ended March 31, 2023 and 2022. There were no fixed-maturity securities that were written down to fair value due to an intention to be sold during the three months ended March 31, 2023. There was one fixed-maturity security that was written down to fair value due to an intention to be sold during the three months ended March 31, 2022, resulting in an impairment charge of less than $1 million.
There were 2,900 fixed-maturity securities with a total unrealized loss of $776 million, which were in an unrealized loss position at March 31, 2023. Of that total, 26 fixed-maturity securities had fair values below 70% of amortized cost. There were 3,272 fixed-maturity securities with a total unrealized loss of $908 million, which were in an unrealized loss position at December 31, 2022. Of that total, 49 fixed-maturity securities had fair values below 70% of amortized cost.