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Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Changes in the carrying amount of goodwill by segment [Roll Forward] |  |  |  |
Goodwill, gross |  |  | $ 11,573 |
Accumulated impairment losses |  |  | (9,556) |
Balance as of March 31, 2020, net |  |  | 2,017 |
Acquisition related adjustments |  |  | 18 |
Divestitures |  |  | (1,355) |
Assets held for sale |  |  | (4) |
Foreign currency translation |  |  | 60 |
Goodwill, gross | $ 10,292 |  | 10,292 |
Accumulated impairment losses | (9,556) |  | (9,556) |
Balance as of December 31, 2020, net | 736 |  | 736 |
Goodwill impairment losses | 0 | $ 53 | 0 | $ 2,940
GBS |  |  |  |
Changes in the carrying amount of goodwill by segment [Roll Forward] |  |  |  |
Goodwill, gross |  |  | 6,507 |
Accumulated impairment losses |  |  | (4,490) |
Balance as of March 31, 2020, net |  |  | 2,017 |
Acquisition related adjustments |  |  | 18 |
Divestitures |  |  | (1,355) |
Assets held for sale |  |  | (4) |
Foreign currency translation |  |  | 60 |
Goodwill, gross | 5,226 |  | 5,226 |
Accumulated impairment losses | (4,490) |  | (4,490) |
Balance as of December 31, 2020, net | 736 |  | 736 |
GIS |  |  |  |
Changes in the carrying amount of goodwill by segment [Roll Forward] |  |  |  |
Goodwill, gross |  |  | 5,066 |
Accumulated impairment losses |  |  | (5,066) |
Balance as of March 31, 2020, net |  |  | 0 |
Acquisition related adjustments |  |  | 0 |
Divestitures |  |  | 0 |
Assets held for sale |  |  | 0 |
Foreign currency translation |  |  | 0 |
Goodwill, gross | 5,066 |  | 5,066 |
Accumulated impairment losses | (5,066) |  | (5,066) |
Balance as of December 31, 2020, net | $ 0 |  | $ 0 |

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