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Financial Instruments - Derivatives (Details) € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, kr in Millions, $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2019 USD ($) t | Dec. 31, 2018 USD ($) t | Mar. 31, 2019 JPY (¥) | Mar. 31, 2019 KRW (₩) | Mar. 31, 2019 CNY (¥) | Mar. 31, 2019 SEK (kr) | Mar. 31, 2019 EUR (€) | Mar. 31, 2019 MXN ($) | Mar. 31, 2019 GBP (£) | Dec. 31, 2018 JPY (¥) | Dec. 31, 2018 KRW (₩) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 SEK (kr) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 GBP (£)
Commodity contracts | Maturity December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | t | 188 | 257 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brazil, Brazil Real | Foreign currency | Maturity June 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | $ 3 | $ 5 |  |  |  |  | € 2 |  |  |  |  |  |  | € 4 |  |
China, Yuan Renminbi | Foreign currency | Maturity December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 17 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Member Countries, Euro | Cross Currency Interest Rate Contract [Member] | Maturity September 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | € |  |  |  |  |  |  | 206 |  |  |  |  |  |  |  |  |
Euro Member Countries, Euro | Foreign currency | Maturity June 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | kr |  |  |  |  |  | kr 540 |  |  |  |  |  |  | kr 540 |  |  |
Euro Member Countries, Euro | Foreign currency | Maturity December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 10 | 19 |  |  | ¥ 39 |  |  |  | £ 10 |  |  | ¥ 0 |  |  |  | £ 7
Japan, Yen | Cross Currency Interest Rate Contract [Member] | Maturity February 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | ¥ |  |  | ¥ 10,978 |  |  |  |  |  |  |  |  |  |  |  |  |
Japan, Yen | Foreign currency | Maturity December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 2 | 3 |  | ₩ 4,243 | ¥ 66 |  |  |  |  |  | ₩ 5,785 | ¥ 89 |  |  |  |
Korea (South), Won | Foreign currency | Maturity December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 30 | $ 7 | ¥ 186 |  |  |  | 5 |  |  | ¥ 266 |  |  |  | 6 |  |
Sweden, Kronor | Foreign currency | Maturity January 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | € |  |  |  |  |  |  | 44 |  |  |  |  |  |  | 56 |  |
United States of America, Dollars | Cross Currency Interest Rate Contract [Member] | Maturity September 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States of America, Dollars | Cross Currency Interest Rate Contract [Member] | Maturity February 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States of America, Dollars | Foreign currency | Maturity December 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives |  |  |  |  |  |  |  | $ 445 |  |  |  |  |  |  | $ 575 |
United States of America, Dollars | Foreign currency | Maturity January 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | € |  |  |  |  |  |  | € 14 |  |  |  |  |  |  | € 0 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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