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Casualty, Environmental and Other Reserves - Schedule of Claims Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 324 | $ 374 | $ 374
Charged to Expense | 107 | 72 | 114
Payments | (126) | (122) | (114)
Balance end of period | 305 | 324 | 374
Casualty Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 199 | 228 | 229
Charged to Expense | 56 | 21 | 43
Payments | (68) | (50) | (44)
Balance end of period | 187 | 199 | 228
Environmental Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 80 | 90 | 95
Charged to Expense | 17 | 10 | 26
Payments | (23) | (20) | (31)
Balance end of period | 74 | 80 | 90
Other Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 45 | 56 | 50
Charged to Expense | 34 | 41 | 45
Payments | (35) | (52) | (39)
Balance end of period | $ 44 | $ 45 | $ 56

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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