Income Taxes Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended					11 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($) country	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 13, 2019 USD ($)	Dec. 31, 2019 USD ($) country	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Income Tax Contingency [Line Items]
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 0						$ 0		$ 0	$ 230
Asset Write Down and Other										66
Deferred Tax Assets, Valuation Allowance	1,166				$ 1,702			$ 1,166	1,702
Income Tax Expense (Benefit)	9						135		34	137
Income (Loss) Before Income Taxes	(15)						3,819		(2,757)	(2,656)
Income Tax Expense (Benefit) Related To Fresh Start Accounting Adjustment							32
Income Tax Expense (Benefit) Related To Impairments							14
Other Restructuring Charges, Net							77
Income Tax Expense (Benefit) Related To Other Restructuring Charges, Net							3
gain on settlement of liabilities subject to compromise net of tax							4,300
Tax Benefit Recognized From Goodwill Impairment									70
Goodwill, Impairment Loss, Net of Tax									1,900
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(56)					$ (73)	(17)		(166)	459
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense										52
Asset Impairment Charges								20
Restructuring Charges	0		$ 61				189		126	183
Warrant Fair Value Adjustment	0						0		(70)	(86)
Currency Devaluation Charges	0						0		49	0
Goodwill, Impairment Loss	0	$ 399	102	$ 229	1,900		730		1,917	0
Asset Write Down and Other	0			$ 69			374		238	1,701
Impairment of Long-Lived Assets Held-for-use	0						(20)		(151)	(928)
Inventory Write-down	0						159		80	540
Gain (Loss) on Disposition of Business	0		$ 114				(112)		0	96
Bad Debt Expense							4		5
Undistributed Earnings of Foreign Subsidiaries					1,600				1,600
Operating Loss Carryforwards	4,000							4,000
Tax Credit Carryforward, Amount Before Adjustment For Expected Expiration	77							77
Tax Effect Of The Anticipated Expired Operating Loss Carryforward	257
Cancellation Of Debt Income	480
Annual Limitation Of Operating Loss Carryforwards	23							23
Operating Loss Carryforwards Estimated To Expire Before Use	1,200							1,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1						15		1	10
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 77				$ 60	$ 61		$ 77	60	61
Number of Countries in which Entity Operates | country	80							80
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 6							$ 6
Bond Tender and Call Premium	0						0		(34)	0
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	0						0		0	249
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Valuation Adjustment Amount	0						$ 0		$ 0	$ (301)
UNITED STATES
Income Tax Contingency [Line Items]
Operating Loss Carryforwards	639							639
Tax Credit Carryforward, Amount Before Adjustment For Expected Expiration	66							66
Operating Loss Carryforward Before Adjustment For Expected Expiration	1,900							1,900
Tax Credit Carryforward, Amount	11							11
Decrease In Tax Credit Carryforward For Expected Expiration	66
Foreign Tax Credit Carryforward [Member] | UNITED STATES
Income Tax Contingency [Line Items]
Tax Credit Carryforward, Amount Before Adjustment For Expected Expiration	31							31
Research Tax Credit Carryforward [Member] | UNITED STATES
Income Tax Contingency [Line Items]
Tax Credit Carryforward, Amount Before Adjustment For Expected Expiration	$ 35							$ 35