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Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Billions | 1 Months Ended
--- | ---
Dec. 31, 2020 | Aug. 31, 2020 | May 31, 2020 | Mar. 31, 2020 | Nov. 30, 2019
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
Shares issued (in shares) | 32,000 |  |  |  |
Proceeds from sale of equity | $ 2.6 |  |  |  |

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