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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 959 | $ 967 |
Other revenues | 23 | 18 |
Operating revenues and other | 982 | 985 |
Contract with Customer, Asset and Liability [Abstract] |  |  |
Receivables from contracts with customers, included within receivables | 486 |  | $ 458
Deferred revenue | 3,848 |  | 3,779
Revenue recognized | 297 | 285 |
Revenue, Performance Obligation Satisfied over Time [Abstract] |  |  |
Performance obligations | 12,900 |  |
Deferred Non-insurance Warranty Revenue and Other Liabilities [Member] |  |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |
Deferred revenue | 4,000 |  | $ 3,900
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-10 |  |  |
Revenue, Performance Obligation Satisfied over Time [Abstract] |  |  |
Performance obligations | $ 1,400 |  |
Expected timing of satisfaction, period | 9 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |
Revenue, Performance Obligation Satisfied over Time [Abstract] |  |  |
Performance obligations | $ 2,100 |  |
Expected timing of satisfaction, period | 1 year |  |
Non-insurance Warranty Services [Member] | CNA Financial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 301 | 281 |
Contract Drilling [Member] | Diamond Offshore [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 229 | 234 |
Transportation and Storage of Natural Gas and NGLs and Other Services [Member] | Boardwalk Pipeline [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 332 | 339 |
Lodging and Related Services [Member] | Loews Hotels & Co [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 142 | 180 |
Rigid Plastic Packaging and Recycled Resin [Member] | Corporate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 256 | $ 214 |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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