Equity - Preferred Stock (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 06, 2018
Class of Stock [Line Items]
Issuance of preferred shares	13,800,000	13,800
Preferred Stock, Liquidation Preference, Value	$ 345,000,000	$ 0
Preferred Stock, Redemption Date	Nov. 15, 2023
Preferred Stock, end of period
Class of Stock [Line Items]
Issuance of preferred shares			13,800,000
Preferred Stock, Liquidation Preference, Value			$ 25,000
Share Price			$ 25.00
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised		$ 334,000,000
Other Restrictions on Payment of Dividends	no
Preferred Stock, Redemption Price Per Share	$ 25,000
Preferred Stock, Redemption Terms	P90D
Rating Agency Event [Member] | Preferred Stock, end of period
Class of Stock [Line Items]
Preferred Stock, Redemption Price Per Share	$ 25,500
Regulatory Capital Event [Member] | Preferred Stock, end of period
Class of Stock [Line Items]
Preferred Stock, Redemption Price Per Share	$ 25,000