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Property, Plant and Equipment-Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment-Net
Gross property plant and equipment	$ 13,867		$ 13,867		$ 13,777
Less: Accumulated depreciation and amortization	6,657		6,657		6,145
Net property, plant and equipment	7,210		7,210		7,632
Construction in progress expenditures incurred but not yet paid			78	$ 73	43	$ 42
Depreciation and amortization	198	$ 207	637	650
Changes in plant turnaround activity
Long-lived and intangible asset impairment	236	0	236	0
U.K.
Changes in plant turnaround activity
Long-lived and intangible asset impairment			50
Long-lived assets	450		450
Land
Property, Plant and Equipment-Net
Gross property plant and equipment	68		68		68
Machinery and equipment(1)
Property, Plant and Equipment-Net
Gross property plant and equipment	12,696		12,696		12,539
Changes in plant turnaround activity
Balance at the beginning of the period			226	246	246
Additions			215	68
Depreciation			(84)	(77)
Effect of exchange rate changes			0	(2)
Balance at the end of the period	357	$ 235	357	$ 235	226	$ 246
Long-lived and intangible asset impairment	169
Buildings and improvements(1)
Property, Plant and Equipment-Net
Gross property plant and equipment	908		908		895
Changes in plant turnaround activity
Long-lived and intangible asset impairment	5
Construction in progress
Property, Plant and Equipment-Net
Gross property plant and equipment	195		195		$ 275
Changes in plant turnaround activity
Long-lived and intangible asset impairment	8
Property, plant and equipment
Changes in plant turnaround activity
Long-lived and intangible asset impairment			182
Property, plant and equipment | U.K.
Changes in plant turnaround activity
Long-lived assets	$ 390		$ 390

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Additions made to the plant turnaround costs during the period related to inspections, replacements and overhauls of plant machinery and equipment.

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Future cash outflow to pay for construction in progress expenditures that have occurred.

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