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Segments - Consolidating Statement of Income by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues: |  |  |  |
Insurance premiums | $ 1,806 | $ 1,767 | $ 5,185 | $ 5,196
Net investment income | 557 | 561 | 1,639 | 1,570
Investment gains (losses) | 16 | 45 | 93 | 18
Contract drilling revenues | 357 | 340 | 1,113 | 1,141
Other revenues | 785 | 574 | 2,150 | 1,842
Total | 3,521 | 3,287 | 10,180 | 9,767
Expenses: |  |  |  |
Insurance claims and policyholders' benefits | 1,480 | 1,202 | 4,053 | 3,949
Amortization of deferred acquisition costs | 309 | 314 | 926 | 926
Contract drilling expenses | 198 | 187 | 598 | 598
Other operating expenses | 1,047 | 898 | 2,978 | 3,416
Interest | 223 | 130 | 504 | 403
Total | 3,257 | 2,731 | 9,059 | 9,292
Income (loss) before income tax | 264 | 556 | 1,121 | 475
Income tax (expense) benefit | (52) | (163) | (240) | (171)
Net income (loss) | 212 | 393 | 881 | 304
Amounts attributable to noncontrolling interests | (55) | (66) | (198) | 60
Net income (loss) attributable to Loews Corporation | 157 | 327 | 683 | 364
CNA Financial [Member] | Operating Segments [Member] |  |  |  |
Revenues: |  |  |  |
Insurance premiums | 1,806 | 1,767 | 5,185 | 5,196
Net investment income | 509 | 524 | 1,529 | 1,461
Investment gains (losses) | 16 | 45 | 93 | 30
Other revenues | 110 | 97 | 329 | 297
Total | 2,441 | 2,433 | 7,136 | 6,984
Expenses: |  |  |  |
Insurance claims and policyholders' benefits | 1,480 | 1,202 | 4,053 | 3,949
Amortization of deferred acquisition costs | 309 | 314 | 926 | 926
Other operating expenses | 379 | 402 | 1,086 | 1,158
Interest | 83 | 39 | 166 | 127
Total | 2,251 | 1,957 | 6,231 | 6,160
Income (loss) before income tax | 190 | 476 | 905 | 824
Income tax (expense) benefit | (44) | (132) | (226) | (203)
Net income (loss) | 146 | 344 | 679 | 621
Amounts attributable to noncontrolling interests | (16) | (36) | (71) | (64)
Net income (loss) attributable to Loews Corporation | 130 | 308 | 608 | 557
Diamond Offshore [Member] | Operating Segments [Member] |  |  |  |
Revenues: |  |  |  |
Net investment income |  | 1 | 1 | 1
Investment gains (losses) |  |  |  | (12)
Contract drilling revenues | 357 | 340 | 1,113 | 1,141
Other revenues | 11 | 9 | 30 | 69
Total | 368 | 350 | 1,144 | 1,199
Expenses: |  |  |  |
Contract drilling expenses | 198 | 187 | 598 | 598
Other operating expenses | 109 | 108 | 414 | 1,082
Interest | 64 | 19 | 119 | 69
Total | 371 | 314 | 1,131 | 1,749
Income (loss) before income tax | (3) | 36 | 13 | (550)
Income tax (expense) benefit | 14 | (22) | 35 | 78
Net income (loss) | 11 | 14 | 48 | (472)
Amounts attributable to noncontrolling interests | (5) | (7) | (23) | 228
Net income (loss) attributable to Loews Corporation | 6 | 7 | 25 | (244)
Boardwalk Pipeline [Member] | Operating Segments [Member] |  |  |  |
Revenues: |  |  |  |
Other revenues | 301 | 306 | 987 | 961
Total | 301 | 306 | 987 | 961
Expenses: |  |  |  |
Other operating expenses | 191 | 212 | 646 | 615
Interest | 41 | 48 | 131 | 136
Total | 232 | 260 | 777 | 751
Income (loss) before income tax | 69 | 46 | 210 | 210
Income tax (expense) benefit | (18) | (9) | (46) | (44)
Net income (loss) | 51 | 37 | 164 | 166
Amounts attributable to noncontrolling interests | (34) | (23) | (104) | (104)
Net income (loss) attributable to Loews Corporation | 17 | 14 | 60 | 62
Loews Hotels And Co [Member] | Operating Segments [Member] |  |  |  |
Revenues: |  |  |  |
Other revenues | 162 | 161 | 510 | 513
Total | 162 | 161 | 510 | 513
Expenses: |  |  |  |
Other operating expenses | 147 | 151 | 443 | 479
Interest | 7 | 6 | 20 | 17
Total | 154 | 157 | 463 | 496
Income (loss) before income tax | 8 | 4 | 47 | 17
Income tax (expense) benefit | (4) | (1) | (23) | (10)
Net income (loss) | 4 | 3 | 24 | 7
Net income (loss) attributable to Loews Corporation | 4 | 3 | 24 | 7
Corporate [Member] |  |  |  |
Revenues: |  |  |  |
Net investment income | 48 | 36 | 109 | 108
Other revenues | 201 | 1 | 294 | 2
Total | 249 | 37 | 403 | 110
Expenses: |  |  |  |
Other operating expenses | 221 | 25 | 389 | 82
Interest | 28 | 18 | 68 | 54
Total | $ 249 | 43 | 457 | 136
Income (loss) before income tax |  | (6) | (54) | (26)
Income tax (expense) benefit |  | 1 | 20 | 8
Net income (loss) |  | (5) | (34) | (18)
Net income (loss) attributable to Loews Corporation |  | $ (5) | $ (34) | $ (18)

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