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Benefit Plans - Pension plan assets by category and FV (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
US |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 353 | $ 404 | $ 368
Expected contribution in next fiscal year | 1 |  |
US | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 33 | 51 |
US | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 35 | 55 |
US | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 258 | 273 |
Fixed income securities maturity (in years) | 10 years |  |
US | Fixed income index - Long government bond |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 24 | 21 |
Fixed income securities maturity (in years) | 10 years |  |
US | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 3 | 4 |
US | Fair Value, Inputs, Level 2 |  |  |
Plan assets |  |  |
Fair value of plan assets | 353 | 404 |
US | Fair Value, Inputs, Level 2 | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 33 | 51 |
US | Fair Value, Inputs, Level 2 | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 35 | 55 |
US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 258 | 273 |
US | Fair Value, Inputs, Level 2 | Fixed income index - Long government bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 24 | 21 |
US | Fair Value, Inputs, Level 2 | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | 3 | 4 |
Non-US |  |  |
Plan assets |  |  |
Fair value of plan assets | 207 | 235 | $ 211
Expected contribution in next fiscal year | 3 |  |
Non-US | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 3 | 12 |
Non-US | Equity index - Canada |  |  |
Plan assets |  |  |
Fair value of plan assets | 13 | 22 |
Non-US | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 15 | 52 |
Non-US | Equity index - Real estate |  |  |
Plan assets |  |  |
Fair value of plan assets | 2 | 5 |
Non-US | Fixed income index - Intermediate bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 34 | 25 |
Non-US | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 99 | 84 |
Non-US | Other |  |  |
Plan assets |  |  |
Fair value of plan assets | 24 | 24 |
Non-US | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | 17 | 11 |
Non-US | Fair Value, Inputs, Level 1 |  |  |
Plan assets |  |  |
Fair value of plan assets | 2 | 2 |
Non-US | Fair Value, Inputs, Level 1 | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | 2 | 2 |
Non-US | Fair Value, Inputs, Level 2 |  |  |
Plan assets |  |  |
Fair value of plan assets | 205 | 233 |
Non-US | Fair Value, Inputs, Level 2 | Equity index - U.S. |  |  |
Plan assets |  |  |
Fair value of plan assets | 3 | 12 |
Non-US | Fair Value, Inputs, Level 2 | Equity index - Canada |  |  |
Plan assets |  |  |
Fair value of plan assets | 13 | 22 |
Non-US | Fair Value, Inputs, Level 2 | Equity index - International |  |  |
Plan assets |  |  |
Fair value of plan assets | 15 | 52 |
Non-US | Fair Value, Inputs, Level 2 | Equity index - Real estate |  |  |
Plan assets |  |  |
Fair value of plan assets | 2 | 5 |
Non-US | Fair Value, Inputs, Level 2 | Fixed income index - Intermediate bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 34 | 25 |
Non-US | Fair Value, Inputs, Level 2 | Fixed income index- Long bond |  |  |
Plan assets |  |  |
Fair value of plan assets | 99 | 84 |
Non-US | Fair Value, Inputs, Level 2 | Other |  |  |
Plan assets |  |  |
Fair value of plan assets | 24 | 24 |
Non-US | Fair Value, Inputs, Level 2 | Cash |  |  |
Plan assets |  |  |
Fair value of plan assets | $ 15 | $ 9 |

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