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Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 $ / shares | Sep. 30, 2019 USD ($) vote $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 $ / shares | Sep. 30, 2019 USD ($) vote $ / shares | Sep. 30, 2018 $ / shares | May 31, 2019 USD ($)
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote |  | 1 |  |  | 1 |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.41 | $ 0.41 | $ 0.39 | $ 0.39 | $ 0.80 | $ 0.73 |
Accelerated Share Repurchase |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Authorized repurchase amount (up to) | $ |  |  |  |  |  |  | $ 600,000,000
Common stock repurchased (shares) | shares |  |  | 4.7 |  |  |  |
Average price per share of shares repurchased (in usd per share) | $ / shares |  |  | $ 127.68 |  |  |  |
Authorized amount available for future repurchases | $ |  | $ 2,000,000,000.0 |  |  | $ 2,000,000,000.0 |  |
Open Market Transactions |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Common stock repurchased (shares) | shares |  | 5.2 | 0.7 |  |  |  |
Value of shares repurchased under the ASR program | $ |  | $ 750,000,000 | $ 84,000,000 |  |  |  |
Average price per share of shares repurchased (in usd per share) | $ / shares |  | $ 144.28 | $ 128.64 |  |  |  |

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