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Accounting Policies Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,101 |  | $ 1,945 |  |  |  | $ 6,318 | $ 5,789 |  |
Operating Income (Loss) | 300 | $ 256 | 309 | $ 372 | $ 257 | $ 629 | 902 | 938 | $ 1,194 | $ 1,087
Net Income (Loss) Attributable to Parent | $ 180 | $ 80 | $ 152 | $ 163 | $ 138 | $ 301 | $ 540 | $ 453 | $ 533 | $ 493
Net income basic (in dollars per share) | $ 0.59 | $ 0.25 | $ 0.48 | $ 0.51 | $ 0.43 | $ 0.94 | $ 1.74 | $ 1.42 | $ 1.68 | $ 1.49
Net income diluted (in dollars per share) | $ 0.58 | $ 0.25 | $ 0.48 | $ 0.51 | $ 0.43 | $ 0.93 | $ 1.73 | $ 1.41 | $ 1.66 | $ 1.48
Plumbing Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 992 |  | $ 950 |  |  |  | $ 2,995 | $ 2,771 |  |
Decorative Architectural Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 673 |  | 562 |  |  |  | 2,024 | 1,719 |  |
Cabinetry Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 239 |  | 229 |  |  |  | 724 | 711 |  |
Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 197 |  | 204 |  |  |  | 575 | 588 |  |
Operating Segments |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 2,101 | $ 1,853 | 1,945 | $ 2,066 | $ 1,778 | $ 3,844 | 6,318 | 5,789 | $ 7,642 | $ 7,361
Operating Income (Loss) | 320 | 277 | 331 | 398 | 280 | 678 | 962 | 1,009 | 1,286 | 1,181
Operating Segments | Plumbing Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 992 | 961 | 950 | 949 | 872 | 1,821 | 2,995 | 2,771 | 3,732 | 3,529
Operating Income (Loss) | 177 | 165 | 175 | 200 | 162 | 362 | 534 | 537 | 702 | 654
Operating Segments | Decorative Architectural Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 673 | 487 | 562 | 661 | 496 | 1,157 | 2,024 | 1,719 | 2,206 | 2,092
Operating Income (Loss) | 104 | 83 | 112 | 149 | 94 | 243 | 338 | 355 | 438 | 433
Operating Segments | Cabinetry Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 239 | 223 | 229 | 251 | 231 | 482 | 724 | 711 | 934 | 970
Operating Income (Loss) | 23 | 25 | 20 | 31 | 16 | 47 | 62 | 67 | 92 | 97
Operating Segments | Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 197 | 182 | 204 | 205 | 179 | 384 | 575 | 588 | 770 | 770
Operating Income (Loss) | 16 | 4 | 24 | 18 | 8 | 26 | 28 | 50 | 54 | (3)
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Expenses | $ (20) | (21) | (22) | (26) | 23 | (49) | $ (60) | (71) | (92) | (94)
Previous Accounting Guidance |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  | 264 | 295 | 357 | 253 | 610 |  | 905 | 1,169 | 1,053
Net Income (Loss) Attributable to Parent |  | $ 87 | $ 148 | $ 158 | $ 140 | $ 298 |  | $ 446 | $ 533 | $ 491
Net income basic (in dollars per share) |  | $ 0.28 | $ 0.47 | $ 0.50 | $ 0.44 | $ 0.93 |  | $ 1.40 | $ 1.68 | $ 1.49
Net income diluted (in dollars per share) |  | $ 0.27 | $ 0.46 | $ 0.49 | $ 0.43 | $ 0.92 |  | $ 1.38 | $ 1.66 | $ 1.47
Previous Accounting Guidance | Operating Segments |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 1,874 | $ 1,936 | $ 2,057 | $ 1,777 | $ 3,834 |  | $ 5,770 | $ 7,644 | $ 7,357
Operating Income (Loss) |  | 287 | 321 | 387 | 279 | 666 |  | 987 | 1,274 | 1,162
Previous Accounting Guidance | Operating Segments | Plumbing Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  | 972 | 951 | 949 | 863 | 1,812 |  | 2,763 | 3,735 | 3,526
Operating Income (Loss) |  | 169 | 175 | 198 | 156 | 354 |  | 529 | 698 | 642
Previous Accounting Guidance | Operating Segments | Decorative Architectural Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  | 494 | 553 | 653 | 505 | 1,158 |  | 1,711 | 2,205 | 2,092
Operating Income (Loss) |  | 88 | 104 | 141 | 101 | 242 |  | 346 | 434 | 430
Previous Accounting Guidance | Operating Segments | Cabinetry Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  | 223 | 229 | 251 | 231 | 482 |  | 711 | 934 | 970
Operating Income (Loss) |  | 25 | 19 | 30 | 16 | 46 |  | 65 | 90 | 93
Previous Accounting Guidance | Operating Segments | Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  | 185 | 203 | 204 | 178 | 382 |  | 585 | 770 | 769
Operating Income (Loss) |  | 5 | 23 | 18 | 6 | 24 |  | 47 | 52 | (3)
Previous Accounting Guidance | Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Expenses |  | $ (23) | $ (26) | $ (30) | $ (26) | $ (56) |  | $ (82) | $ (105) | $ (109)

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