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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 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
Other, net | $ 0 |  |  | (2) |  |  |  | $ (11) | 37 |  |
Reclassifications, tax (benefit) |  | $ 59 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  | 9 |  |  |  |  | 19 | (2) | 4
Operating Income (Loss) |  |  |  | 7 |  |  |  |  | 11 | (1) | 2
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  | $ 7 |  |  |  |  | $ 22 | $ 26 |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  |  |  | $ 32

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