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Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class of Stock [Line Items] |  |  |  |
Conversion of common units to common shares (in shares) |  |  | 8,054 | 12,009
Dividends declared per share (in usd per share) | $ 0.275 | $ 0.275 | $ 0.550 | $ 0.550
Common Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
At the market, offering program established, aggregate value | $ 300 |  | $ 300 |
Conversion of common units to common shares (in shares) |  |  | 8,054 |

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