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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net Sales | $ 3,841 | $ 3,686 | $ 7,671 | $ 7,385 |  |  |
Cost of Goods Sold | (2,949) | (2,785) | (5,925) | (5,545) |  |  |
Net income | (164) | (154) | (244) | (323) |  |  |
Selling, general and administrative expense | (588) | (579) | (1,179) | (1,155) |  |  |
Other (income) expense | 45 | 16 | 82 | 24 |  |  |
Cumulative effect of adoption of new accounting standards |  |  |  |  |  | $ (1) | $ 0
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Net Sales | 8 |  | 7 |  |  |  |
Net income | (6) |  | (5) |  |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cost of Goods Sold |  | 7 |  | 12 |  |  |
Selling, general and administrative expense |  | 4 |  | 7 |  |  |
General and administrative expense |  | $ 3 |  | $ 6 |  |  |
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 |  | 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) |  | (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 |  | $ 2 |  |  |  |

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