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Segment and Geographic Information (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Net sales $ 1,965 $ 1,898 $ 1,709 $ 1,932 $ 1,883 $ 2,066 $ 2,144 $ 2,025 $ 7,504 $ 8,118 $ 8,635
Income from operations $ 178 $ 79 $ 36 $ 136 $ 102 $ 226 $ 194 $ 134 429 656 1,408
Depreciation and amortization                 773 713 641
Other income, net                 44 38 52
Provision for (benefit from) income taxes                 (42) 108 300
Payments to Acquire Property, Plant, and Equipment                 525 787 702
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 7,504 8,118 8,635
Operating Segments [Member] | Olefins [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 1,532 1,782 2,019
Income from operations                 160 260 573
Depreciation and amortization                 139 142 138
Other income, net                 4 5 4
Provision for (benefit from) income taxes                 38 60 128
Payments to Acquire Property, Plant, and Equipment                 74 117 110
Operating Segments [Member] | Olefins [Member] | Polyethylene [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 1,226 1,301 1,519
Operating Segments [Member] | Olefins [Member] | Styrene, Feedstock And Other [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 306 481 500
Operating Segments [Member] | Vinyls [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 5,972 6,336 6,616
Income from operations                 301 451 913
Depreciation and amortization                 626 563 491
Other income, net                 30 18 35
Provision for (benefit from) income taxes                 (93) 40 212
Payments to Acquire Property, Plant, and Equipment                 443 664 585
Operating Segments [Member] | Vinyls [Member] | PVC, Caustic Soda And Other [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 4,570 5,068 5,359
Operating Segments [Member] | Vinyls [Member] | Building Products [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 1,402 1,268 1,257
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Income from operations                 (32) (55) (78)
Depreciation and amortization                 8 8 12
Other income, net                 10 15 13
Provision for (benefit from) income taxes                 13 8 (40)
Payments to Acquire Property, Plant, and Equipment                 8 6 7
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 277 325 502
Intersegment Eliminations [Member] | Olefins [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 276 324 500
Intersegment Eliminations [Member] | Vinyls [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 $ 1 $ 1 $ 2