Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		4 Months Ended	8 Months Ended	12 Months Ended
		Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Change in Tax Loss and Credit Carryforwards, Prior Period Restatement		$ 238	$ 163		$ 163
Change in Valuation Allowance, Prior Period Restatement		238	163		163
Predecessor [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		305	287		225
Additions charges to expenses			51		119
Deductions from reserves	[1]		(33)		(57)
Balance at end of period			305		287
Predecessor [Member] | SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		274	214		237
Additions charges to expenses			241		275
Deductions from reserves	[2]		(181)		(298)
Balance at end of period			274		214
Predecessor [Member] | SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		1,220	1,145		1,529
Additions charges to expenses			95		6
Deductions from reserves	[3]		(20)		(390)
Balance at end of period			1,220		$ 1,145
Successor [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		0		$ 10
Additions charges to expenses		10		91
Deductions from reserves	[1]	0		(16)
Balance at end of period		10	0	85
Successor [Member] | SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		0		55
Additions charges to expenses		89		406
Deductions from reserves	[2]	(34)		(283)
Balance at end of period		55	0	178
Successor [Member] | SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		1,160		1,140
Additions charges to expenses		34		190
Deductions from reserves	[3]	(54)		(243)
Balance at end of period		$ 1,140	$ 1,160	$ 1,087

[1] Deductions include write-offs, recoveries and currency translation adjustments.

[2] Deductions include disposals and currency translation adjustments.

[3] Deductions include currency translation adjustments.