v3.25.3
Goodwill and Intangible Assets (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Goodwill and Intangible Assets    
Summary of goodwill and non-amortizing intangible assets

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Goodwill

    

Cable Certificates

    

Other

    

Total

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Balance at January 1, 2025

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$

746

​

550

​

41

​

1,337

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Impairments

​

​

(108)

​

(401)

​

(16)

​

(525)

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Balance at September 30, 2025

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$

638

​

149

​

25

​

812

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Schedule of intangible assets subject to amortization

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September 30, 2025

    

December 31, 2024

 

​

​

Gross

​

​

​

Net

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Gross

​

​

​

Net

​

​

​

carrying

​

Accumulated

​

carrying

​

carrying

​

Accumulated

​

carrying

 

​

    

amount

    

amortization

    

amount

    

amount

    

amortization

    

amount

 

​

​

amounts in millions

 

Customer relationships

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$

515

​

(204)

 

311

​

​

515

 

(173)

 

342

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Other amortizable intangible assets

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177

​

(108)

 

69

​

 

165

 

(96)

 

69

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Total

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$

692

​

(312)

 

380

​

​

680

 

(269)

 

411

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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December 31, 2024

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December 31, 2023

 

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​

Gross

​

​

​

Net

​

Gross

​

​

​

Net

​

​

​

carrying

​

Accumulated

​

carrying

​

carrying

​

Accumulated

​

carrying

 

​

    

amount

    

amortization

    

amount

    

amount

    

amortization

    

amount

 

​

​

amounts in millions

 

Customer relationships

​

$

515

 

(173)

 

342

​

​

515

 

(132)

 

383

​

Other amortizable intangible assets

​

 

165

 

(96)

 

69

​

 

156

 

(78)

 

78

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Total

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$

680

 

(269)

 

411

​

​

671

 

(210)

 

461

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Schedule of estimated amortization expense for amortizable intangible assets Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in millions):

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Remainder of 2025

    

$

14

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2026

​

$

55

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2027

​

$

52

​

2028

​

$

50

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2029

​

$

44

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Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in millions):

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​

​

​

​

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2025

    

$

56

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2026

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$

53

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2027

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$

50

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2028

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$

49

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2029

​

$

42

​