Fresh Start Accounting - Footnotes (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 12, 2019
Fresh-Start Adjustment [Line Items]
Inventories		$ 987	$ 1,071
Accrued income taxes		214	214
Fresh-Start Adjustment, Increase (Decrease), Property and Equipment, Gross		2,127	7,445
Net change in cash and cash equivalents		(493)	(641)
Restricted cash		261	398
Net change in other non-current assets		388	336
Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities		557	618
Liabilities subject to compromise		0	7,634
Cancellation of predecessor common stock			1
Net change in successor common stock			2,897
Net change in accumulated deficit			(10,682)
Intangible assets, net		1,123	166
Fresh-Start Adjustment, Increase (Decrease), Accumulated Depreciation and Amortization		0	(5,607)
Property, plant, and equipment, net		2,127	1,838
Debtor Reorganization Items, Discharge of Claims and Liabilities	$ 0	4,297
Developed technology
Fresh-Start Adjustment [Line Items]
Intangible assets, net		728	74
Customer relationships
Fresh-Start Adjustment [Line Items]
Intangible assets, net		0	39
Trade Names
Fresh-Start Adjustment [Line Items]
Intangible assets, net		395	0
Other Intangible Assets [Member]
Fresh-Start Adjustment [Line Items]
Intangible assets, net		0	53
Reorganization Adjustments
Fresh-Start Adjustment [Line Items]
Inventories			0
Fresh-Start Adjustment, Proceeds From Exit Senior Notes		1,600
Transfers from restricted cash for the return of cash collateral (for letters of credit)		(167)
Payment of debtor in possession financing principal and interest		(1,531)
Fresh-Start Adjustment, Payments For Amended And Restated Credit Agreement, Principal And Interest		(306)
Fresh-Start Adjustment, Payments To Escrow For Remaining Professional Fees		30
Fresh-Start Adjustment, Payments For Deferred Financing Fees		22
Fresh-Start Adjustment, Payments For Other Liabilities		(18)
Payment of professional fees		(8)
Net change in cash and cash equivalents		(148)	148
Restricted cash		(137)	(137)
Fresh-Start Adjustment, Increase (Decrease) In Other Current Assets To Deferred Financing Fees On The Exit Financing Facilities		4
Fresh-Start Adjustment, Increase (Decrease) In Write-Off Of Deferred Financing Fees On The Amended And Restated Credit Agreement		(2)
Net change in other non-current assets		25	25
Payment of debtor in possession financing interest		(3)
Fresh-Start Adjustment, Payments For Amended And Restated Credit Agreement, Interest		(1)
Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities		(22)	(22)
Liabilities subject to compromise		7,634	(7,634)
Fresh-Start Adjustment, Increase (Decrease) In Issuance Of Common Stock To Creditors		(2,837)
Fresh-Start Adjustment, Increase (Decrease) In Issuance Of Take-Back Debt To Creditors		(500)
Cancellation of predecessor preferred stock		24	(24)
Cancellation of predecessor common stock			(1)
Fresh-Start Adjustment, Issuance Of Successor Common Stock To Creditors		2,837
Fresh-Start Adjustment, Issuance Of Common Stock To Former Stockholders		(29)	(29)
Fresh-Start Adjustment, Issuance Of Warrants		(31)	(31)
Net change in predecessor capital in excess of par value			(35)
Net change in accumulated deficit		4,271	4,271
Intangible assets, net			0
Property, plant, and equipment, net			0
Fresh-Start Adjustment, Increase (Decrease) In Accrual of Deferred Financing Fees On Exit Financing Facilities		1
Fresh-Start Adjustment, Increase (Decrease) In Write-Off Of Deferred Financing Fees On The Amended And Restated Credit Agreement		(2)
Fresh Start Adjustments
Fresh-Start Adjustment [Line Items]
Inventories			(84)
Fresh-Start Adjustment, Increase (Decrease), Deferred Costs, Current			10
Accrued income taxes			4
Net change in cash and cash equivalents			0
Restricted cash			0
Net change in other non-current assets			27
Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities			(39)
Cancellation of predecessor common stock			0
Net change in predecessor capital in excess of par value			(6,698)
Net change in accumulated deficit			6,411
Intangible assets, net			957
Fresh-Start Adjustment, Increase (Decrease) In Noncurrent Right-Of-Use Assets			13
Property, plant, and equipment, net			289
Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Assets, Noncurrent			14
Fresh-Start Adjustment, Increase (Decrease), Current Maturities of Capital Lease Obligations			5
Fresh-Start Adjustment, Increase (Decrease) In Intangible Liabilities, Current			15
Fresh-Start Adjustment, Increase (Decrease) In Operating Lease Liabilities, Noncurrent			22
Fresh-Start Adjustment, Increase (Decrease) In Intangible Liabilities, Noncurrent			7
Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Liabilities, Noncurrent			43
Raw Materials [Member]
Fresh-Start Adjustment [Line Items]
Inventories		78	78
Work In Process [Member]
Fresh-Start Adjustment [Line Items]
Inventories		51	55
Finished Goods [Member]
Fresh-Start Adjustment [Line Items]
Inventories		858	938
Land, Buildings and Improvements [Member]
Fresh-Start Adjustment [Line Items]
Fresh-Start Adjustment, Increase (Decrease), Property and Equipment, Gross		569	1,205
Rental and service equipment [Member]
Fresh-Start Adjustment [Line Items]
Fresh-Start Adjustment, Increase (Decrease), Property and Equipment, Gross		1,280	4,697
Machinery and other [Member]
Fresh-Start Adjustment [Line Items]
Fresh-Start Adjustment, Increase (Decrease), Property and Equipment, Gross		$ 278	$ 1,543