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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
The following tables provide details of revenue by major products/service offerings and revenue by geography.
Revenue by Major Products/Service Offerings
Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in millions)2024
2023 (1)
2024
2023 (1)
Hybrid Platform & Solutions$4,600 $4,187 $13,272 $12,388 
Transaction Processing1,925 1,759 5,889 5,444 
Total Software$6,524 $5,947 $19,162 $17,832 
Business Transformation2,327 2,291 7,004 6,869 
Application Operations1,921 1,944 5,761 5,924 
Technology Consulting905 943 2,752 2,808 
Total Consulting$5,152 $5,178 $15,517 $15,601 
Hybrid Infrastructure1,765 1,943 5,928 5,912 
Infrastructure Support1,277 1,329 3,835 4,076 
Total Infrastructure$3,042 $3,272 $9,764 $9,988 
Financing (2)
181 186 543 566 
Other68 170 214 491 
Total revenue$14,968 $14,752 $45,199 $44,479 
(1)Recast to reflect January 2024 segment changes. Refer to note 4, "Segments," for additional information.
(2)Contains lease and loan financing arrangements which are not subject to the guidance on revenue from contracts with customers.
Schedule of disaggregation of revenue by geography
 Three Months Ended September 30, Nine Months Ended September 30,
(Dollars in millions)2024202320242023
Americas$7,453 $7,686 $22,727 $22,810 
Europe/Middle East/Africa4,584 4,223 13,619 13,156 
Asia Pacific2,932 2,843 8,853 8,513 
Total$14,968 $14,752 $45,199 $44,479 
Schedule of reconciliation of contract balances
The following table provides information about notes and accounts receivable–trade, contract assets and deferred income balances.
(Dollars in millions)At September 30, 2024At December 31, 2023
Notes and accounts receivable — trade (net of allowances of $132 in 2024 and $192 in 2023)
$5,390 $7,214 
Contract assets (1)
$572 $505 
Deferred income (current)$12,882 $13,451 
Deferred income (noncurrent)$3,666 $3,533 
(1)Included within prepaid expenses and other current assets in the Consolidated Balance Sheet.
Schedule of notes and accounts receivable - trade allowance for credit losses
The following table provides roll forwards of the notes and accounts receivable–trade allowance for expected credit losses for the nine months ended September 30, 2024 and the year ended December 31, 2023.
(Dollars in millions)    
January 1, 2024Additions / (Releases)
Write-offs (1)
Foreign currency and otherSeptember 30, 2024
$192$4$(71)$7$132
January 1, 2023Additions / (Releases)
Write-offs (1)
Foreign currency and otherDecember 31, 2023
$233$32$(79)$6$192
(1)The majority of the write-offs during the period related to receivables which had been previously reserved.