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Casualty, Environmental and Other Reserves - Schedule of Claims Activity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 305 | $ 324 | $ 374
Charged to Expense | 107 | 107 | 72
Payments | (98) | (126) | (122)
Balance end of period | 314 | 305 | 324
Casualty Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 187 | 199 | 228
Charged to Expense | 55 | 56 | 21
Payments | (46) | (68) | (50)
Balance end of period | 196 | 187 | 199
Environmental Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 74 | 80 | 90
Charged to Expense | 20 | 17 | 10
Payments | (18) | (23) | (20)
Balance end of period | 76 | 74 | 80
Other Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 44 | 45 | 56
Charged to Expense | 32 | 34 | 41
Payments | (34) | (35) | (52)
Balance end of period | $ 42 | $ 44 | $ 45

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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=121557415&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=121557415&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=121557415&loc=d3e14326-108349 + Details
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