Income Taxes Level 4 (Details) - Domestic and Foreign Components of Income Continuing Operations - USD ($) $ in Millions		6 Months Ended		12 Months Ended
		Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2018
Income Tax Examination [Line Items]
Domestic		$ (46)	$ 2,754	$ (138)	$ (216)
Foreign		(58)	206	(11)	52
(Loss) income from continuing operations before income tax and earnings from unconsolidated entities	[1]	(104)	2,960	(149)	(164)
(Loss) income from discontinued operations before income tax, earnings from unconsolidated entities		$ 5	$ 155	$ (70)	$ 38

[1] Excludes (loss) income before income taxes of $(70), $5, $155, and $38 for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, respectively, related to the Held for Sale Business.