Goodwill and Other Intangible Assets
A summary of the changes in the carrying amount of goodwill is as follows:

 CNA FinancialBoardwalk PipelinesTotal
(In millions)   
    
Balance, December 31, 2022
$109 $237 $346 
Other adjustments
Balance, December 31, 2023 and 2024
110 237 347 

A summary of the net carrying amount of other intangible assets is as follows:

December 31, 2024December 31, 2023
 Gross
Carrying
Amount
Accumulated AmortizationGross
Carrying Amount
Accumulated Amortization
(In millions)    
     
Finite-lived intangible assets:    
Customer relationships$93 $24 $93 $21 
Other10 8 11 
Total finite-lived intangible assets103 32 104 30 
 
Indefinite-lived intangible assets76 77 
Total other intangible assets$179 $32 $181 $30 

Amortization expense for each of the years ended December 31, 2024, 2023 and 2022 of $4 million, $3 million, and $3 million is reported in Operating expenses and other on the Consolidated Statements of Operations. At December 31, 2024, estimated amortization expense in each of the next five years is approximately $4 million.
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About Goodwill & Intangibles Disclosures

Goodwill and intangible asset disclosures reveal the premium paid in acquisitions and how management assesses whether that premium retains its value. Since goodwill is no longer amortized under US GAAP, the annual impairment test is the only mechanism that adjusts carrying values downward — making the assumptions behind that test critically important for investors.

Key signals: a history of goodwill impairments suggests management consistently overpays for acquisitions. Watch the gap between reporting unit fair value and carrying amount — when fair value exceeds carrying amount by less than 10-20%, a small decline in business performance could trigger a write-down. For finite-lived intangibles, examine useful life assumptions across customer relationships, technology, and trade names; aggressive estimates inflate near-term earnings. Compare total intangibles-to-total-assets ratios against peers to assess acquisition dependency. Rising goodwill as a percentage of equity can signal balance sheet fragility.