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Shareholders' Equity Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 04, 2019
Class of Stock [Line Items] |  |  |  |
Payments for Repurchase of Common Stock | $ 0 | $ 350 | $ 350 |
Final Shares Received from ASR Program |  |  |  | 0.9
Treasury Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Payments for Repurchase of Common Stock |  | $ 280 |  |
Treasury shares acquired (using cost method), shares |  | 6.0 |  |
Payments for Repurchase of Common Stock |  | $ 280 |  |
Treasury shares acquired, average price per share (in usd per share) |  | $ 43.76 |  |
Treasury Stock Acquired Shares |  | 6.4 |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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