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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, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 374 | $ 374 | $ 400
Charged to Expense | 98 | 114 | 128
Change in Estimate | (26) |  | (28)
Payments | (122) | (114) | (126)
Balance end of period | 324 | 374 | 374
Casualty Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 228 | 229 | 269
Charged to Expense | 47 | 43 | 52
Change in Estimate | (26) |  | (28)
Payments | (50) | (44) | (64)
Balance end of period | 199 | 228 | 229
Environmental Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 90 | 95 | 82
Charged to Expense | 10 | 26 | 46
Change in Estimate | 0 |  | 0
Payments | (20) | (31) | (33)
Balance end of period | 80 | 90 | 95
Other Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 56 | 50 | 49
Charged to Expense | 41 | 45 | 30
Change in Estimate | 0 |  | 0
Payments | (52) | (39) | (29)
Balance end of period | $ 45 | $ 56 | $ 50

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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=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of increase (decrease) in 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=82911808&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=82911808&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=82911808&loc=d3e14326-108349 + Details
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