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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
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,297 |  |  | $ 2,066 |  | $ 4,217 | $ 3,844 |  |  |
Operating Income (Loss) | 358 | $ 256 | $ 309 | 372 | $ 257 | 602 | 629 | $ 938 | $ 1,194 | $ 1,087
Net Income (Loss) Attributable to Parent | $ 211 | $ 80 | $ 152 | $ 163 | $ 138 | $ 360 | $ 301 | $ 453 | $ 533 | $ 493
Net income (in dollars per share) | $ 0.69 | $ 0.25 | $ 0.48 | $ 0.51 | $ 0.43 | $ 1.16 | $ 0.94 | $ 1.42 | $ 1.68 | $ 1.49
Net income (in dollars per share) | $ 0.68 | $ 0.25 | $ 0.48 | $ 0.51 | $ 0.43 | $ 1.15 | $ 0.93 | $ 1.41 | $ 1.66 | $ 1.48
Plumbing Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,032 |  |  | $ 949 |  | $ 2,003 | $ 1,821 |  |  |
Decorative Architectural Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 806 |  |  | 661 |  | 1,351 | 1,157 |  |  |
Cabinetry Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 268 |  |  | 251 |  | 485 | 482 |  |  |
Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 191 |  |  | 205 |  | 378 | 384 |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 2,297 | $ 1,853 | $ 1,945 | 2,066 | $ 1,778 | 4,217 | 3,844 | $ 5,789 | $ 7,642 | $ 7,361
Operating Income (Loss) | 380 | 277 | 331 | 398 | 280 | 642 | 678 | 1,009 | 1,286 | 1,181
Operating Segments | Plumbing Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 1,032 | 961 | 950 | 949 | 872 | 2,003 | 1,821 | 2,771 | 3,732 | 3,529
Operating Income (Loss) | 194 | 165 | 175 | 200 | 162 | 357 | 362 | 537 | 702 | 654
Operating Segments | Decorative Architectural Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 806 | 487 | 562 | 661 | 496 | 1,351 | 1,157 | 1,719 | 2,206 | 2,092
Operating Income (Loss) | 145 | 83 | 112 | 149 | 94 | 234 | 243 | 355 | 438 | 433
Operating Segments | Cabinetry Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 268 | 223 | 229 | 251 | 231 | 485 | 482 | 711 | 934 | 970
Operating Income (Loss) | 33 | 25 | 20 | 31 | 16 | 39 | 47 | 67 | 92 | 97
Operating Segments | Windows and Other Specialty Products |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | 191 | 182 | 204 | 205 | 179 | 378 | 384 | 588 | 770 | 770
Operating Income (Loss) | 8 | 4 | 24 | 18 | 8 | 12 | 26 | 50 | 54 | (3)
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Expenses | $ (22) | (21) | (22) | (26) | 23 | $ (40) | (49) | (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 (in dollars per share) |  | $ 0.28 | $ 0.47 | $ 0.50 | $ 0.44 |  | $ 0.93 | $ 1.40 | $ 1.68 | $ 1.49
Net income (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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