Variable Interest Entities and Unconsolidated Investments (Income from Unconsolidated Investments 10-Q) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Nov. 20, 2019
(Income) from unconsolidated subsidiaries		$ (4)	$ (5)	$ (4)	$ (11)
Greenfield
(Income) from unconsolidated subsidiaries		(3)	(4)	(4)	(6)
Whitby
(Income) from unconsolidated subsidiaries	[1]	0	(2)	0	(6)
Equity method investment, ownership interest sold						50.00%
Calpine Receivables
(Income) from unconsolidated subsidiaries		$ (1)	$ 1	$ 0	$ 1

[1] (1)On November 20, 2019, we sold our 50% interest in Whitby to a third party.