Restructuring and Asset Related Charges 2016 Global Cost Savings and Restructuring Plan (Details) - USD ($) $ in Millions	1 Months Ended		2 Months Ended		3 Months Ended														4 Months Ended	8 Months Ended	12 Months Ended		37 Months Ended
	Sep. 30, 2017	[1]	Aug. 31, 2017	[1]	Dec. 31, 2018		Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017		Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2018
2016 Restructuring Program [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																							$ 708
Restructuring Reserve					$ 1								$ 22						$ 22		$ 1		$ 1
Predecessor [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net			$ 11												$ 160		$ 152			$ 323		$ 556
Predecessor [Member] | 2016 Restructuring Program [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																				$ 10		(81)
Predecessor [Member] | 2016 Restructuring Program [Member] [Domain] | Sundry Income (Expense) - net
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																						3
Predecessor [Member] | 2016 Restructuring Program [Member] [Domain] | Restructuring and Asset Related Charges - Net [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																						(84)
Predecessor [Member] | Employee Severance [Member] | 2016 Restructuring Program [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																						(150)
Predecessor [Member] | Asset Related Charges [Member] | 2016 Restructuring Program [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																						53
Predecessor [Member] | Contract Termination [Member] | 2016 Restructuring Program [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																						$ 16
Successor [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	$ 40				$ 115	[1]	$ 182		$ 91		$ 97		$ 140	[1]					180		$ 485
Successor [Member] | 2016 Restructuring Program [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net																			$ (5)

[1] See Note 6 for additional information.