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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Deferred Tax Assets, Net | $ 2,241 | $ 2,002 |
Deferred Tax Assets, Valuation Allowance | 296 | 230 |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | 141 | $ 1,760
Income Tax Expense (Benefit) | $ 292 | $ 180 | (1,531)
Swiss Federal Tax Administration (FTA) [Member] |  |  |
Deferred Tax Assets, Net |  |  | 1,840
Deferred Tax Assets, Valuation Allowance |  |  | 131
Reduction in Taxes [Member] |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 393
Income Tax Expense (Benefit) |  |  | $ 80

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