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Casualty, Environmental and Other Reserves - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) claim site $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2018 USD ($) claim site $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 30, 2016 USD ($) $ / shares | Dec. 25, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 324 |  |  |  | $ 374 |  |  |  | $ 324 | $ 374 | $ 374 | $ 400
Reduction in reserves |  |  |  |  |  |  |  |  |  | $ 26 |  | $ 28 |
Earnings per share impact (in dollars per share) | $ / shares |  | $ 1.02 | $ 1.05 | $ 1.02 | $ 0.78 | $ 4.63 | $ 0.51 | $ 0.55 | $ 0.39 | $ 3.86 | $ 6.01 | $ 1.81 |
Casualty Reserves |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 199 |  |  |  | $ 228 |  |  |  | $ 199 | $ 228 | $ 229 | 269
Individual claims expected to exceed self-insured retention amount | claim |  | 0 |  |  |  |  |  |  |  | 0 |  |  |
Reduction in reserves |  |  |  |  |  |  |  |  |  | $ 26 |  | 28 |
Earnings from continuing operations |  |  |  |  |  |  |  |  |  | $ 19 |  | $ 18 |
Earnings per share impact (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.02 |  | $ 0.02 |
Casualty Reserves | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention amount per injury | $ 50 |  |  |  |  |  |  |  |  |  |  |  |
Casualty Reserves | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention amount per injury | $ 75 |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 80 |  |  |  | 90 |  |  |  | $ 80 | 90 | $ 95 | 82
Reduction in reserves |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |
Environmental impaired site | site |  | 220 |  |  |  |  |  |  |  | 220 |  |  |
Other Reserves |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 45 |  |  |  | $ 56 |  |  |  | $ 45 | $ 56 | 50 | $ 49
Reduction in reserves |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |

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