Preferred Shares (Details) $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2021
USD ($)
shares
| |
| Series B Preferred Stock | |
| Preferred Shares [Line Items] | |
| Securities issued (in shares) | shares | 750 |
| Depositary shares issued (in shares) | shares | 750,000 |
| Fixed dividend rate per annum (as a percent) | 5.20% |
| Floating dividend rate per annum (as a percent) | 3.428% |
| Aggregate liquidation preference | $ | $ 750 |
| Carrying value | $ | $ 742 |
| Series D Preferred Stock | |
| Preferred Shares [Line Items] | |
| Securities issued (in shares) | shares | 1,600 |
| Depositary shares issued (in shares) | shares | 1,600,000 |
| Fixed dividend rate per annum (as a percent) | 3.55% |
| Floating dividend rate per annum (as a percent) | 2.854% |
| Aggregate liquidation preference | $ | $ 1,600 |
| Carrying value | $ | $ 1,584 |