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Casualty, Environmental and Other Reserves - Schedule of Claims Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 314 | $ 305 | $ 324
Assumed in Acquisition of Quality Carriers | 62 |  |
Charged to Expense | 130 | 107 | 107
Payments | (138) | (98) | (126)
Balance end of period | 368 | 314 | 305
Casualty Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 196 | 187 | 199
Assumed in Acquisition of Quality Carriers | 0 |  |
Charged to Expense | 55 | 55 | 56
Payments | (71) | (46) | (68)
Balance end of period | 180 | 196 | 187
Environmental Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 76 | 74 | 80
Assumed in Acquisition of Quality Carriers | 29 |  |
Charged to Expense | 26 | 20 | 17
Payments | (23) | (18) | (23)
Balance end of period | 108 | 76 | 74
Other Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 42 | 44 | 45
Assumed in Acquisition of Quality Carriers | 33 |  |
Charged to Expense | 49 | 32 | 34
Payments | (44) | (34) | (35)
Balance end of period | $ 80 | $ 42 | $ 44

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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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