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Summary of Significant Accounting Policies - Property, Plant and Equipment, net (Details) - USD ($) $ in Millions		12 Months Ended
	May 21, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
ROU finance leases		$ 80	$ 81
Property, plant and equipment, gross		4,249	4,163
Less: Accumulated depreciation		2,009	1,827
Total Property, plant and equipment, net		2,240	2,336
Gain on disposal of property, plant and equipment		(7)	4	$ (6)
Assets Sold in Purchase and Sale Agreement
Property, Plant and Equipment [Line Items]
Cash consideration received	$ 43
Gain on disposal of property, plant and equipment	$ 10
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment		3,881	3,805
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment		88	87
Land and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment		47	46
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment		38	35
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment		100	95
Other
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment		$ 15	$ 14
Minimum
Property, Plant and Equipment [Line Items]
Right-of-use (ROU) finance leases, Useful life		3 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful life		2 years
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Useful life		1 year
Minimum | Land and improvements
Property, Plant and Equipment [Line Items]
Useful life		10 years
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life		3 years
Minimum | Other
Property, Plant and Equipment [Line Items]
Useful life		5 years
Maximum
Property, Plant and Equipment [Line Items]
Right-of-use (ROU) finance leases, Useful life		18 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful life		30 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Useful life		30 years
Maximum | Land and improvements
Property, Plant and Equipment [Line Items]
Useful life		30 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life		10 years
Maximum | Other
Property, Plant and Equipment [Line Items]
Useful life		30 years

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