Reportable Segments (Reconciliation of Reportable Segment Assets to Consolidated Total Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Current assets		$ 7,463		$ 7,034
Investment assets		334		376
Property, plant and equipment, net		15,337		14,895
Other non-current assets		1,487		1,021
Total assets		28,898		27,505	$ 27,494
Investment in Hemlock Semiconductor Group		270	[1]		105
Operating Segments [Member] | Reportable Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		16,998		16,230	15,356
Operating Segments [Member] | Non Reportable Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		891		1,018	824
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Current assets	[2]	3,301		3,065	5,315
Investment assets	[3]	180		64	61
Property, plant and equipment, net	[4]	1,764		1,928	1,628
Other non-current assets	[5]	$ 5,764		$ 5,200	$ 4,310

[1] (1)The negative carrying value resulted from a one-time charge to this entity in 2019 for the impairment of certain assets. Refer to Note 6 (Investments) to the consolidated financial statements for additional information.

[2] Includes current corporate assets, including cash, other receivables, prepaid expenses and current portion of long-term derivative assets.

[3] Represents corporate equity and cost basis investments. Asset balance does not include equity method affiliate liability balance of $270 million and $105 million for HSG in 2019 and 2017.

[4] Represents corporate property not specifically identifiable to an operating segment.

[5] Includes non-current corporate assets, including goodwill, other intangible assets, pension assets, long-term derivative assets, operating leases and deferred income taxes.