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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net sales | $ (3,830) | $ (3,699) |  |  |
Net income | (80) | (169) |  |  |
Cost of goods sold | (2,976) | (2,760) |  |  |
Selling, general and administrative expense | (591) | (576) |  |  |
Other (income) expense | 37 | 8 |  |  |
Net periodic defined benefits expense (reversal of expense), excluding service cost component | 2 | 10 |  |  |
Cumulative effect of adoption of new accounting standards |  |  |  | $ (1) | $ 0
Accounting Standards Update 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cost of goods sold |  | 5 |  |  |
Selling, general and administrative expense |  | 3 |  |  |
General and administrative expense |  | $ 3 |  |  |
Other (income) expense | 9 |  |  |  |
Accounting Standards Update 2016-09 | Scenario, Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net periodic defined benefits expense (reversal of expense) |  |  | $ 35 |  |
Net periodic defined benefits expense (reversal of expense), corporate related costs |  |  | 5 |  |
Net periodic defined benefits expense (reversal of expense), excluding service cost component |  |  | 90 |  |
Net periodic defined benefits expense (reversal of expense), excluding service cost component, corporate related costs |  |  | $ 15 |  |
Accounting Standards Update 2016-16 | Deferred Income Taxes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption of new accounting standards | 7 |  |  |  |
Accounting Standards Update 2016-16 | Other assets |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption of new accounting standards | (5) |  |  |  |
Accounting Standards Update 2016-16 | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption of new accounting standards | 2 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net sales | 1 |  |  |  |
Net income | $ 1 |  |  |  |

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