Related Party Transactions (Schedule of Base Management Fees and Performance Fees) (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020
Related Party Transactions [Abstract]
Base Management Fee Amount	$ 4	$ 7	$ 9	$ 8	$ 7	$ 8
Performance Fee Amount	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Shares Issued (in shares)	146,452	181,617	208,881	201,827	192,103	184,448
Shares issued subsequent for base management fees to manager for July 2020 (in shares)							52,370