Income Taxes Income Taxes - Geographic Allocation of Income and Provision for Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended		2 Months Ended		3 Months Ended											4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 30, 2017	[1]	Aug. 31, 2017	[1]	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	[2]	Dec. 31, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Successor [Member]
(Loss) Income from continuing operations before income taxes																$ (1,586)		$ (4,793)
Provision for (benefit from) income taxes on continuing operations																(2,673)		220
Net (loss) income from continuing operations	$ (295)				$ (351)	$ (4,960)	$ 514	$ (221)		$ 1,305						1,010		(5,018)
Predecessor [Member]
(Loss) Income from continuing operations before income taxes																	$ 1,791		$ 2,723
Provision for (benefit from) income taxes on continuing operations																	149		641
Net (loss) income from continuing operations			$ (229)									$ 869		$ 1,121			1,761		2,525
Continuing Operations [Member] | Successor [Member]
(Loss) Income from Continuing Operations before Income Taxes, Domestic																(811)		(4,496)
(Loss) Income from Continuing Operations before Income Taxes, Foreign																(775)		(297)
(Loss) Income from continuing operations before income taxes																(1,586)		(4,793)
Current Federal Tax (Benefit) Expense																216		(333)
Current State and Local Tax Expense (Benefit)																22		5
Current Foreign Tax Expense																187		453
Total current tax expense (benefit)																425		125
Deferred Federal Income Tax Expense (Benefit)																(2,790)		162
Deferred State and Local Income Tax Benefit																(48)		(29)
Deferred Foreign Income Tax (Benefit) Expense																(260)		(38)
Total deferred tax expense (benefit)																(3,098)		95
Provision for (benefit from) income taxes on continuing operations																(2,673)		220
Net (loss) income from continuing operations																$ 1,087		$ (5,013)
Continuing Operations [Member] | Predecessor [Member]
(Loss) Income from Continuing Operations before Income Taxes, Domestic																	409		1,415
(Loss) Income from Continuing Operations before Income Taxes, Foreign																	1,382		1,308
(Loss) Income from continuing operations before income taxes																	1,791		2,723
Current Federal Tax (Benefit) Expense																	(563)		4
Current State and Local Tax Expense (Benefit)																	(11)		9
Current Foreign Tax Expense																	282		539
Total current tax expense (benefit)																	(292)		552
Deferred Federal Income Tax Expense (Benefit)																	476		22
Deferred State and Local Income Tax Benefit																	(8)		(29)
Deferred Foreign Income Tax (Benefit) Expense																	(27)		96
Total deferred tax expense (benefit)																	441		89
Provision for (benefit from) income taxes on continuing operations																	149		641
Net (loss) income from continuing operations																	$ 1,642		$ 2,082

[1] Includes income (loss) from discontinued operations after taxes primarily related to the Divested Ag Business of $160 million, $137 million, $29 million, $(20) million, and $(57) million, in the first quarter 2017, second quarter 2017, the period July 1 - August 31, 2017, the period September 1 - September 30, 2017, and fourth quarter 2017, respectively. Additionally, includes income (loss) from discontinued operations after taxes primarily related to Chemours of $(217) million and $10 million, in the first quarter 2017 and second quarter 2017, respectively. See Note 4 for additional information.

[2] Includes loss from discontinued operations after taxes related to the Divested Ag Business of $(5) million in the first quarter 2018. See Note 4 for additional information.