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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets 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, 2021
$112 $237 $349 
Other adjustments(3)(3)
Balance, December 31, 2022
109 237 346 
Other adjustments1 1 
Balance, December 31, 2023
$110 $237 $347 
A summary of the net carrying amount of other intangible assets is as follows:

December 31, 2023December 31, 2022
 Gross
Carrying
Amount
Accumulated AmortizationGross
Carrying Amount
Accumulated Amortization
(In millions)    
     
Finite-lived intangible assets:    
Customer relationships$93 $21 $59 $19 
Other11 9 17 14 
Total finite-lived intangible assets104 30 76 33 
 
Indefinite-lived intangible assets77 68 
Total other intangible assets$181 $30 $144 $33 

Amortization expense for each of the years ended December 31, 2023, 2022 and 2021 of $3 million is reported in Operating expenses and other on the Consolidated Statements of Operations. At December 31, 2023, estimated amortization expense in each of the next five years is approximately $4 million.