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Segments - Consolidating Statement of Income and Total Assets by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues:    
Insurance premiums $ 1,803 $ 1,785
Net investment income 657 506
Investment gains 31 9
Non-insurance warranty revenue 281 238
Operating revenues and other 985 1,043
Total 3,757 3,581
Expenses:    
Insurance claims and policyholders' benefits 1,357 1,339
Amortization of deferred acquisition costs 342 296
Non-insurance warranty expense 260 216
Operating expenses and other 1,149 1,184
Interest 141 141
Total 3,249 3,176
Income (loss) before income tax 508 405
Income tax (expense) benefit (112) (25)
Net income (loss) 396 380
Amounts attributable to noncontrolling interests (2) (87)
Net income (loss) attributable to Loews Corporation 394 293
CNA Financial [Member] | Operating Segments [Member]    
Revenues:    
Insurance premiums 1,803 1,785
Net investment income 571 490
Investment gains 31 9
Non-insurance warranty revenue 281 238
Operating revenues and other 9 13
Total 2,695 2,535
Expenses:    
Insurance claims and policyholders' benefits 1,357 1,339
Amortization of deferred acquisition costs 342 296
Non-insurance warranty expense 260 216
Operating expenses and other 284 302
Interest 34 35
Total 2,277 2,188
Income (loss) before income tax 418 347
Income tax (expense) benefit (77) (55)
Net income (loss) 341 292
Amounts attributable to noncontrolling interests (36) (31)
Net income (loss) attributable to Loews Corporation 305 261
Diamond Offshore [Member] | Operating Segments [Member]    
Revenues:    
Net investment income 2 2
Operating revenues and other 234 297
Total 236 299
Expenses:    
Operating expenses and other 283 296
Interest 30 28
Total 313 324
Income (loss) before income tax (77) (25)
Income tax (expense) benefit 6 44
Net income (loss) (71) 19
Amounts attributable to noncontrolling interests 34 (9)
Net income (loss) attributable to Loews Corporation (37) 10
Boardwalk Pipeline [Member] | Operating Segments [Member]    
Revenues:    
Operating revenues and other 346 337
Total 346 337
Expenses:    
Operating expenses and other 195 198
Interest 45 44
Total 240 242
Income (loss) before income tax 106 95
Income tax (expense) benefit (27) (12)
Net income (loss) 79 83
Amounts attributable to noncontrolling interests   (47)
Net income (loss) attributable to Loews Corporation 79 36
Loews Hotels And Co [Member] | Operating Segments [Member]    
Revenues:    
Operating revenues and other 180 183
Total 180 183
Expenses:    
Operating expenses and other 156 156
Interest 5 7
Total 161 163
Income (loss) before income tax 19 20
Income tax (expense) benefit (6) (7)
Net income (loss) 13 13
Net income (loss) attributable to Loews Corporation 13 13
Corporate [Member]    
Revenues:    
Net investment income 84 14
Operating revenues and other 216 213
Total 300 227
Expenses:    
Operating expenses and other 231 232
Interest 27 27
Total 258 259
Income (loss) before income tax 42 (32)
Income tax (expense) benefit (8) 5
Net income (loss) 34 (27)
Net income (loss) attributable to Loews Corporation $ 34 $ (27)