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Reportable Segment Information (Segment Net Sales and Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net sales | $ 3,015 |  | $ 4,024 | $ 6,392 | $ 7,648
Segment income (loss) | 396 |  | 660 | 849 | 1,175
Corporate | (50) |  | (44) | (110) | (91)
Interest expense, net of interest income | (36) |  | (28) | (59) | (53)
Business restructuring-related costs, net | 173 |  | 182 | 186 | 185
Debt extinguishment charge | 7 |  | 0 | (7) | 0
Environmental remediation charges | (4) |  | (30) | (12) | (40)
Increase in allowance for doubtful accounts related to COVID-19 | 0 | $ 30 | 0 | 30 | 0
Costs associated with accounting investigations | 0 |  | (3) | 0 | (7)
Acquisition-related costs | 0 |  | (10) | 0 | (17)
Income before income taxes | 126 |  | 363 | 445 | 782
Performance Coatings [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net sales | 2,069 |  | 2,430 | 4,077 | 4,538
Segment income (loss) | 362 |  | 425 | 634 | 722
Industrial Coatings [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net sales | 946 |  | 1,594 | 2,315 | 3,110
Segment income (loss) | $ 34 |  | $ 235 | $ 215 | $ 453

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