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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net sales | $ 1,920 |  |  |  | $ 1,778 |  |  |  |
Operating Income (Loss) | 244 | $ 256 | $ 309 | $ 372 | 257 | $ 629 | $ 938 | $ 1,194 | $ 1,087
Other, net | (3) |  |  |  | (4) |  |  |  |
Reclassification from AOCI, Current Period, Tax | $ 59 |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 1 |  |  | 2 | 4
Operating Income (Loss) |  |  |  |  | 3 |  |  | 1 | 2
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  | $ 7 |  |  | $ 26 |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | $ 32

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