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Shareholders' Equity (Details) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Class of Stock [Line Items] |  |
Gross proceeds | $ 1,110,000,000 | $ 0
Liquidation preference per share (in dollars per share) | $ 25,000 |
Series UU Preferred Shares |  |
Class of Stock [Line Items] |  |
Shares issued | 16,800 |
Interest rate | 6.625% |
Shares issued (price per share) | $ 25,000 |
Gross proceeds | $ 420,000,000 |
Depositary shares | 16,800,000 |
Net cash proceeds | 406,000,000 |
Issuance costs | $ 14,000,000 |
Redemption price per Preferred Share | $ 25,000 |
Common Shares issued upon conversion | 2,773.2 |
Series VV Preferred Shares |  |
Class of Stock [Line Items] |  |
Shares issued | 27,600 |
Interest rate | 6.00% |
Shares issued (price per share) | $ 25,000 |
Gross proceeds | $ 690,000,000 |
Depositary shares | 27,600,000 |
Net cash proceeds | 668,000,000 |
Issuance costs | $ 22,000,000 |
Redemption price per Preferred Share | $ 25,000 |
Common Shares issued upon conversion | 2,584 |
Preferred Shares |  |
Class of Stock [Line Items] |  |
Liquidation preference per share (in dollars per share) | $ 25,000 |
Redemption price per Preferred Share | $ 25,000 |
Redemption price after credit rating downgrade | Series UU Preferred Shares |  |
Class of Stock [Line Items] |  |
Redemption price per Preferred Share | 25,500 |
Redemption price after credit rating downgrade | Series VV Preferred Shares |  |
Class of Stock [Line Items] |  |
Redemption price per Preferred Share | 25,500 |
Redemption price after change in control | Series UU Preferred Shares |  |
Class of Stock [Line Items] |  |
Redemption price per Preferred Share | 25,000 |
Redemption price after change in control | Series VV Preferred Shares |  |
Class of Stock [Line Items] |  |
Redemption price per Preferred Share | $ 25,000 |

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