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Casualty, Environmental and Other Reserves - Narrative (Details) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) claim site | May 31, 2018 USD ($) | Jun. 30, 2018 USD ($) claim site $ / shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2018 USD ($) claim site $ / shares | Jun. 30, 2017 USD ($) $ / shares | Dec. 31, 2017 USD ($)
All Contingencies Reserves [Line Items] |  |  |  |  |  |  |
Total reserves | $ 346,000,000 |  | $ 346,000,000 |  | $ 346,000,000 |  | $ 374,000,000
Net Earnings |  |  | $ 877,000,000 | $ 510,000,000 | $ 1,572,000,000 | $ 872,000,000 |
Net Earnings Per Share, Basic (in dollars per share) | $ / shares |  |  | $ 1.02 | $ 0.55 | $ 1.80 | $ 0.94 |
Casualty |  |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |  |
Total reserves | 201,000,000 |  | $ 201,000,000 |  | $ 201,000,000 |  | 228,000,000
Self-insured retention amount, per occurrence | $ 75,000,000 | $ 50,000,000 |  |  |  |  |
Number of individual claims expected to exceed self insured retention amount | claim | 0 |  | 0 |  | 0 |  |
Environmental |  |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |  |
Total reserves | $ 91,000,000 |  | $ 91,000,000 |  | $ 91,000,000 |  | 90,000,000
Environmental impaired sites | site | 218 |  | 218 |  | 218 |  |
Other |  |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |  |
Total reserves | $ 54,000,000 |  | $ 54,000,000 |  | $ 54,000,000 |  | $ 56,000,000

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=109256448&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1252-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256 + Details
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