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Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Billions | 1 Months Ended |
--- | --- | ---
Aug. 31, 2020 | May 31, 2020 | Mar. 31, 2020 | Nov. 30, 2019 | Sep. 30, 2020
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |
Maximum value of shares to be issued under ATM program |  |  |  | $ 1.5 |
Equity forwards |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |
Shares offered | 936 | 903 | 940 | 28,750 |
Forward contract indexed to issuer's equity, forward rate per share | $ 79.52 | $ 82.44 | $ 89.76 | $ 85.99 |
If net share settlement was elected | Equity forwards |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value |  |  |  |  | 1,900

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