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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Mar. 31, 2020
Income Tax Footnote Disclosure [Line Items] |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  | $ 41 |  |  |
Gross unrecognized tax benefits | $ 563 |  | $ 90 | $ 563 |  |  | $ 983
Effective Income Tax Rate Reconciliation, Percent | 14.00% | 8.00% |  | 11.00% | (140.00%) |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 630 |  |  |  |  |
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory |  |  | $ 1,170 |  |  |  |
Deferred Tax Asset, Period Of Reversal |  |  | 20 years |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  |  | $ 5 |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  |  | (441) |  |  |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions |  |  |  | 35 |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | (2) |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  | (24) |  |  |
Unrecognized Tax Benefits Changes Resulting From Foreign Currency Translation |  |  |  | $ 7 |  |  |
Pro Forma [Member] |  |  |  |  |  |  |
Income Tax Footnote Disclosure [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 16.00% |  |  | 14.00% |  |
Reclassification, Other [Member] |  |  |  |  |  |  |
Income Tax Footnote Disclosure [Line Items] |  |  |  |  |  |  |
Taxes Payable, Current |  |  |  |  |  | $ 80 |

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from intra-entity transfer of asset within consolidated group. Excludes intra-entity transfer of inventory. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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