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Quarterly Financial Data (Unaudited) - Quarterly Charges and Items Affecting Comparability (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2017
Quarterly Data |  |  |  |  |  |  |
Net earnings related to tax reform legislation |  |  |  |  |  |  | $ 37,423,000
Gas-fired power plant projects | U.S. |  |  |  |  |  |  |
Quarterly Data |  |  |  |  |  |  |
Effect of forecast revision on estimated project cost | $ 41,000,000 |  | $ 194,000,000 | $ 25,000,000 |  |  |
Effect of forecast revision on estimated project cost, in dollars per diluted share | $ 0.19 |  | $ 0.89 | $ 0.11 |  |  |
Downstream project | U.S. |  |  |  |  |  |  |
Quarterly Data |  |  |  |  |  |  |
Effect of forecast revision on estimated project cost | $ 29,000,000 | $ 9,000,000 | $ 6,000,000 |  |  |  |
Effect of forecast revision on estimated project cost, in dollars per diluted share | $ 0.13 | $ 0.04 | $ 0.03 |  |  |  |
Net earnings related to tax reform legislation | $ 37,000,000 |  |  |  |  |  |
Net earnings related to tax reform legislation, in dollars per diluted share | $ 0.27 |  |  |  |  |  |
Petrochemicals project | U.S. |  |  |  |  |  |  |
Quarterly Data |  |  |  |  |  |  |
Effect of forecast revision on estimated project cost |  |  |  |  | $ 241,000,000 | $ 24,000,000 |
Effect of forecast revision on estimated project cost, in dollars per diluted share |  |  |  |  | $ 1.10 | $ 0.10 |

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