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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

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