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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, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 04, 2021
Class of Stock [Line Items] |  |  |  |  |
Payments for Repurchase of Common Stock | $ 500 | $ 0 |  | $ 500 |
Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Payments for Repurchase of Common Stock | $ 400 |  |  |  |
Treasury shares acquired (using cost method), shares | 8.0 |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  | $ 51.53 |  |  |
Treasury Stock Acquired Shares |  | 7.8 |  |  |
Subsequent Event | Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  |  | $ 51.10 |  |
Final Shares Received from ASR Program |  |  |  |  | 2.0

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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=123570139&loc=d3e3291-108585 + Details
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