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Wireless Licenses, Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Wireless Licenses
The carrying amounts of our Wireless licenses are as follows:
At March 31,At December 31,
(dollars in millions)20242023
Wireless licenses$156,111 $155,667 
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of Goodwill are as follows:
(dollars in millions)ConsumerBusinessTotal
Balance at January 1, 2024(1)
$21,177 $1,666 $22,843 
Reclassifications, adjustments and other
— (1)(1)
Balance at March 31, 2024
$21,177 $1,665 $22,842 
(1) Goodwill is net of accumulated impairment charges of $5.8 billion related to our Business reporting unit.
Composition of Other Intangible Assets, Net
The following table displays the composition of Other intangible assets, net as well as the respective amortization periods:
 At March 31, 2024At December 31, 2023
(dollars in millions)Gross
Amount		Accumulated
Amortization		Net
Amount		Gross
Amount		Accumulated
Amortization		Net
Amount
Customer lists (5 to 13 years)
$4,335 $(2,387)$1,948 $4,335 $(2,193)$2,142 
Non-network internal-use software (7 years)
25,950 (18,387)7,563 25,524 (17,949)7,575 
Other (4 to 25 years)
2,656 (1,332)1,324 2,656 (1,316)1,340 
Total$32,941 $(22,106)$10,835 $32,515 $(21,458)$11,057 
Amortization Expense for Other Intangible Assets
The amortization expense for Other intangible assets was as follows: 
Three Months Ended
(dollars in millions)March 31,
2024$698 
2023647 
Estimated Future Amortization Expense for Other Intangible Assets
The estimated future amortization expense for Other intangible assets for the remainder of the current year and next 5 years is as follows:
Years(dollars in millions)
Remainder of 2024$1,997 
20252,430 
20262,187 
20271,628 
20281,220 
2029595