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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 ($) | Dec. 31, 2019 USD ($) claim site $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2019 USD ($) claim site $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 30, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 305 |  |  |  | $ 324 |  |  |  | $ 305 | $ 324 | $ 374 | $ 374
Earnings per share impact (in dollars per share) | $ / shares |  | $ 0.99 | $ 1.08 | $ 1.08 | $ 1.02 | $ 1.02 | $ 1.05 | $ 1.02 | $ 0.78 | $ 4.18 | $ 3.86 | $ 6.01 |
Casualty |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 187 |  |  |  | $ 199 |  |  |  | $ 187 | $ 199 | $ 228 | 229
Individual claims expected to exceed self-insured retention amount | claim |  | 0 |  |  |  |  |  |  |  | 0 |  |  |
Casualty | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention amount per injury | $ 50 |  |  |  |  |  |  |  |  |  |  |  |
Casualty | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention amount per injury | $ 75 |  |  |  |  |  |  |  |  |  |  |  |
Personal Injury |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 129 |  |  |  | 143 |  |  |  | $ 129 | 143 |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 74 |  |  |  | 80 |  |  |  | $ 74 | 80 | 90 | 95
Environmental impaired sites | site |  | 220 |  |  |  |  |  |  |  | 220 |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves |  | $ 44 |  |  |  | $ 45 |  |  |  | $ 44 | $ 45 | $ 56 | $ 50

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