| Dec 31, 2021 | Mar 31, 2023 | Mar 31, 2024 | Mar 31, 2025 |
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| Cash and cash equivalents | 2,223 | 1,847 | 1,553 | 1,786 |
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| Restricted cash | 17 | 12 | 1 | 3 |
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| Accounts Receivable, Net, Current | 2,279 | 1,523 | 1,599 | 1,345 |
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| Deferred costs (current portion) | 920 | 1,070 | 1,081 | 1,009 |
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| Prepaid expenses and other current assets | 337 | 510 | 514 | 446 |
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| Total current assets | 5,777 | 4,963 | 4,747 | 4,589 |
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| Property and equipment, net | 2,923 | 2,779 | 2,674 | 2,570 |
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| Operating right-of-use assets, net | 1,361 | 964 | 864 | 731 |
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| Deferred costs (noncurrent portion) | 1,265 | 1,166 | 920 | 1,040 |
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| Deferred taxes | 675 | 248 | 220 | 204 |
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| Goodwill | 732 | 812 | 805 | 790 |
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| Intangible assets, net | 36 | 171 | 188 | 218 |
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| Pension assets | 58 | 94 | 105 | 148 |
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| Other Assets | 385 | 267 | 67 | 162 |
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| Total assets | 13,213 | 11,464 | 10,590 | 10,452 |
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| Accounts payable | 1,140 | 1,774 | 1,408 | 1,351 |
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| Sales and Excise Tax Payable, Current | 357 | 347 | 327 | 256 |
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| Short-term Debt | 105 | 110 | 126 | 129 |
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| Accrued compensation and benefits | 381 | 533 | 609 | 652 |
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| Deferred Revenue, Current | 872 | 820 | 825 | 746 |
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| Operating Lease, Liability, Current | 360 | 316 | 285 | 274 |
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| Accrued contract costs | 585 | 346 | 487 | 437 |
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| Other accrued expenses and liabilities | 744 | 624 | 521 | 454 |
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| Total current liabilities | 4,544 | 4,868 | 4,589 | 4,300 |
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| Long-term debt | - | 3,111 | 3,112 | 3,042 |
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| Retirement and nonpension postretirement benefit obligations | 856 | 504 | 500 | 483 |
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| Deferred Revenue, Noncurrent | 475 | 362 | 314 | 341 |
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| Operating Lease, Liability, Noncurrent | 1,007 | 707 | 622 | 511 |
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| Other noncurrent liabilities | 501 | 450 | 332 | 443 |
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| Total liabilities | 10,511 | 10,002 | 9,468 | 9,121 |
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| Common Stocks, Including Additional Paid in Capital | 4,284 | 4,428 | 4,524 | 4,631 |
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| Accumulated deficit | -375 | -1,978 | -2,319 | -2,067 |
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| Treasury stock, at cost (shares: March 31, 2025 - 7.5, March 31, 2024 - 3.3) | - | 23 | 45 | 184 |
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| Accumulated other comprehensive income (loss) | -1,143 | -1,062 | -1,145 | -1,160 |
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| Total stockholders' equity before non-controlling interests | 2,702 | 1,462 | 1,122 | 1,331 |
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| Non-controlling interests | 3 | 97 | 107 | 113 |
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| Total equity | 2,702 | 1,462 | 1,122 | 1,331 |
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| Total liabilities and equity | 13,213 | 11,464 | 10,590 | 10,452 |
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