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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  | $ (1,531) | $ 60 | $ 406 |
Gross unrecognized tax benefits |  |  | 983 | 417 | $ 457 | $ 389
Amount of unrecognized tax benefits that would affect the effective tax rate |  |  | 722 |  |  |
Combined amount of accrued interest and penalties related to uncertain tax positions |  |  | 34 | 17 |  |
Deferred Tax Assets, Valuation Allowance |  |  | 288 | 162 |  |
Deferred Tax Assets, Gross |  |  | 2,328 | 296 |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ 630 | $ 1,170 | 1,760 |  |  |
Deferred Tax Assets, Net |  |  | 1,902 | 33 |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  | 25 |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  | 148 |  |  |
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory |  |  | $ 1,818 | $ 0 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 21.00% | 31.50% |
Amount of foreign earnings that is not permanently reinvested (available for repatriation without a material cost) |  |  | $ 2,700 |  |  |
State [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating Loss Carryforwards |  |  | 1,500 |  |  |
Net operating loss attributable to various acquired companies |  |  | 5 |  |  |
Tax credit carry forwards |  |  | 131 |  |  |
Reduction in Taxes [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  | 80 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 393 |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  | 541 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Tax credit carry forwards |  |  | 5 |  |  |
Cash, Cash Equivalents, and Short-term Investments |  |  | 4,400 |  |  |
Swiss Federal Tax Administration (FTA) [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | 131 |  |  |
Deferred Tax Assets, Net |  |  | $ 1,840 |  |  |

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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