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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 967 | $ 1,023
Other revenues | 18 | 20
Operating revenues and other | 985 | 1,043
CNA Financial [Member] | Non-insurance Warranty [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 281 | 238
Diamond Offshore [Member] | Drilling Contracts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 234 | 296
Boardwalk Pipeline [Member] | Transportation and Storage of Natural Gas and NGLs and Other Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 339 | 331
Loews Hotels And Co [Member] | Lodging and Related Services [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | 180 | 183
Corporate [Member] | Rigid Plastic Packaging and Recycled Resin [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues from contracts with customers | $ 214 | $ 213

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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