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Consolidating Financial Information - Consolidating Statement of Income Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenues:        
Insurance premiums $ 1,767 $ 1,751 $ 5,196 $ 5,173
Net investment income 561 321 1,570 1,419
Investment gains (losses) 45 (50) 18 (42)
Contract drilling revenues 340 599 1,141 1,816
Other revenues 574 548 1,842 1,716
Total     9,767 10,082
Expenses:        
Insurance claims and policyholders' benefits 1,202 1,200 3,949 4,008
Amortization of deferred acquisition costs 314 319 926 936
Contract drilling expenses 187 276 598 971
Other operating expenses 898 898 3,416 3,026
Interest 130 128 403 393
Total 2,731 2,821 9,292 9,334
Income (loss) before income tax 556 348 475 748
Income tax (expense) benefit (163) (66) (171) (170)
Net income (loss) 393 282 304 578
Amounts attributable to noncontrolling interests (66) (100) 60 (117)
Net income (loss) attributable to Loews Corporation     364 461
Eliminations [Member]        
Revenues:        
Intercompany interest and dividends     (706) (733)
Total     (706) (733)
Expenses:        
Income (loss) before income tax     (706) (733)
Net income (loss)     (706) (733)
Net income (loss) attributable to Loews Corporation     (706) (733)
CNA Financial [Member]        
Expenses:        
Income (loss) before income tax 476 234 824 713
CNA Financial [Member] | Operating Segments [Member]        
Revenues:        
Insurance premiums     5,196 5,173
Net investment income     1,461 1,412
Investment gains (losses)     30 (42)
Other revenues     297 289
Total     6,984 6,832
Expenses:        
Insurance claims and policyholders' benefits     3,949 4,008
Amortization of deferred acquisition costs     926 936
Other operating expenses     1,158 1,058
Interest     127 117
Total     6,160 6,119
Income (loss) before income tax     824 713
Income tax (expense) benefit     (203) (162)
Net income (loss)     621 551
Amounts attributable to noncontrolling interests     (64) (56)
Net income (loss) attributable to Loews Corporation     557 495
Diamond Offshore [Member]        
Expenses:        
Income (loss) before income tax 36 139 (538) (42)
Diamond Offshore [Member] | Operating Segments [Member]        
Revenues:        
Net investment income     1 2
Investment gains (losses)     (12)  
Contract drilling revenues     1,141 1,816
Other revenues     69 49
Total     1,199 1,867
Expenses:        
Contract drilling expenses     598 971
Other operating expenses     1,082 867
Interest     69 71
Total     1,749 1,909
Income (loss) before income tax     (550) (42)
Income tax (expense) benefit     78 (6)
Net income (loss)     (472) (48)
Amounts attributable to noncontrolling interests     228 14
Net income (loss) attributable to Loews Corporation     (244) (34)
Boardwalk Pipeline [Member]        
Expenses:        
Income (loss) before income tax 46 48 210 163
Boardwalk Pipeline [Member] | Operating Segments [Member]        
Revenues:        
Net investment income       1
Other revenues     961 924
Total     961 925
Expenses:        
Other operating expenses     615 628
Interest     136 134
Total     751 762
Income (loss) before income tax     210 163
Income tax (expense) benefit     (44) (33)
Net income (loss)     166 130
Amounts attributable to noncontrolling interests     (104) (75)
Net income (loss) attributable to Loews Corporation     62 55
Loews Hotels [Member]        
Expenses:        
Income (loss) before income tax $ 4 $ 1 17 25
Loews Hotels [Member] | Operating Segments [Member]        
Revenues:        
Other revenues     513 452
Total     513 452
Expenses:        
Other operating expenses     479 412
Interest     17 15
Total     496 427
Income (loss) before income tax     17 25
Income tax (expense) benefit     (10) (10)
Net income (loss)     7 15
Net income (loss) attributable to Loews Corporation     7 15
Corporate and Other [Member]        
Revenues:        
Net investment income     108 4
Intercompany interest and dividends     706 733
Other revenues     2 2
Total     816 739
Expenses:        
Other operating expenses     82 61
Interest     54 56
Total     136 117
Income (loss) before income tax     680 622
Income tax (expense) benefit     8 41
Net income (loss)     688 663
Net income (loss) attributable to Loews Corporation     $ 688 $ 663