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Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022
Acquisition Costs |  |  |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |  |  |
Beginning of period balance | $ 185 | $ 183 | $ 202 | $ 182 | $ 202 |
Costs incurred | 36 | 31 |  | 104 | 96 |
Amortization | (32) | (37) |  | (97) | (117) |
Change in contract costs held for sale |  |  |  | 0 | (4) |
End of period balance | 189 | 177 | 183 | 189 | 177 | $ 202
Acquisition Costs | Held-for-sale | EMEA Business |  |  |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |  |  |
Classified as held for sale |  | 10 | 10 |  | 10 | 6
Fulfillment Costs |  |  |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |  |  |
Beginning of period balance | 204 | 186 | 192 | 184 | 192 |
Costs incurred | 41 | 41 |  | 126 | 120 |
Amortization | (36) | (35) |  | (101) | (106) |
Change in contract costs held for sale |  |  |  | 0 | (14) |
End of period balance | $ 209 | 192 | 186 | $ 209 | 192 | 192
Fulfillment Costs | Held-for-sale | EMEA Business |  |  |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |  |  |
Classified as held for sale |  | $ 14 | $ 14 |  | $ 14 | $ 0

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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