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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 11,081 | $ 10,822 | $ 10,647 | $ 10,348 | $ 10,203 | $ 10,176 | $ 10,647 | $ 10,176
Foreign currency translation adjustment | (6) |  |  | 97 |  |  | 87 | 38
Tax on foreign currency translation adjustment | 0 |  |  | 0 |  |  | (8) | 0
Foreign currency translation adjustment | 1 |  |  | (2) |  |  | (2) | 0
Ending balance | 11,219 | 11,081 | 10,822 | 10,600 | 10,348 | 10,203 | 11,219 | 10,600
Total |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (222) | (337) | (435) | (345) | (345) | (269) | (435) | (269)
Foreign currency translation adjustment | (6) | 37 | 56 | 97 | 6 | (65) |  |
Amount of currency translation adjustment relating to divestiture of foreign subsidiaries reclassified into net income |  |  | 8 |  |  |  |  |
Tax on foreign currency translation adjustment | (3) | 65 | 20 | 14 | (5) | (10) |  |
Income tax impact on amortization of post-retirement benefit plan items |  |  |  |  |  | (1) |  |
Foreign currency translation adjustment for post-retirement benefit plans | 1 | (2) |  |  |  |  |  |
Foreign currency translation adjustment |  |  | (1) | (2) |  | 2 |  |
Unrealized gain on derivative hedge agreements | 1 | 15 | 15 |  |  | (3) |  |
Income tax benefit on unrealized gain on derivative hedge agreements | 1 | (2) | (2) |  |  |  |  |
Ending balance | (233) | (222) | (337) | (232) | (345) | (345) | (233) | (232)
Foreign Currency Translation |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (182) | (284) | (368) | (270) | (271) | (196) | (368) | (196)
Foreign currency translation adjustment | (6) | 37 | 56 | 97 | 6 | (65) |  |
Amount of currency translation adjustment relating to divestiture of foreign subsidiaries reclassified into net income |  |  | 8 |  |  |  |  |
Tax on foreign currency translation adjustment | (3) | 65 | 20 | 14 | (5) | (10) |  |
Ending balance | (191) | (182) | (284) | (159) | (270) | (271) | (191) | (159)
Post-retirement Benefit Plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (55) | (54) | (53) | (71) | (71) | (72) | (53) | (72)
Income tax impact on amortization of post-retirement benefit plan items |  |  |  |  |  | (1) |  |
Foreign currency translation adjustment for post-retirement benefit plans | 1 | (2) |  |  |  |  |  |
Foreign currency translation adjustment |  |  | (1) | (2) |  | 2 |  |
Income tax impact on unrealized gain on derivative hedge agreements |  |  |  | (1) |  |  |  |
Ending balance | (54) | (55) | (54) | (73) | (71) | (71) | (54) | (73)
Derivative Instruments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 15 | 1 | (14) | (4) | (3) | (1) | (14) | (1)
Unrealized gain on derivative hedge agreements | 1 | 15 | 15 |  |  | (3) |  |
Income tax benefit on unrealized gain on derivative hedge agreements | 1 | (2) | (2) |  |  |  |  |
Income tax impact on unrealized gain on derivative hedge agreements |  |  |  | (1) |  |  |  |
Ending balance | 12 | 15 | 1 | 0 | (4) | (3) | $ 12 | $ 0
Revenue | Total |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | (3) | 2 | 3 | 1 | (1) |  |  |
Revenue | Derivative Instruments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | (3) | 2 | 3 | 1 | $ (1) |  |  |
Cost of Revenue | Total |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Unrealized gain on derivative hedge agreements |  |  |  | 3 |  |  |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | (2) | (1) | (1) | 1 |  | 1 |  |
Cost of Revenue | Derivative Instruments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Unrealized gain on derivative hedge agreements |  |  |  | 3 |  |  |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | $ (2) | (1) | $ (1) | $ 1 |  | $ 1 |  |
Other non-operating income | Total |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Amortization of actuarial gain on post-retirement benefit plans into other non-operating income, net |  | 1 |  |  |  |  |  |
Other non-operating income | Post-retirement Benefit Plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Amortization of actuarial gain on post-retirement benefit plans into other non-operating income, net |  | $ 1 |  |  |  |  |  |

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