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Business Segments - Consolidated Revenues and Income (Loss) by Business Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,287 | $ 3,169 | $ 9,767 | $ 10,082
Income (loss) before income tax and noncontrolling interests | 556 | 348 | 475 | 748
Net income (loss) | 327 | 182 | 364 | 461
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests | 45 | (50) | 18 | (42)
Investment gains (losses) included in net income (loss) | 27 | (29) | 12 | (18)
CNA Financial [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,433 | 2,153 | 6,984 | 6,832
Income (loss) before income tax and noncontrolling interests | 476 | 234 | 824 | 713
Net income (loss) | 308 | 161 | 557 | 495
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests | 45 | (50) | 30 | (42)
Investment gains (losses) included in net income (loss) | 27 | (29) | 16 | (18)
CNA Financial [Member] | Other Non-Core [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 345 | 324 | 996 | 978
Income (loss) before income tax and noncontrolling interests | (49) | (120) | (355) | (410)
Net income (loss) | (4) | (44) | (141) | (167)
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests | 18 | 2 | 12 | (2)
Investment gains (losses) included in net income (loss) | 11 | 1 | 4 | 5
CNA Financial [Member] | Property and Casualty [Member] | Specialty [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 946 | 846 | 2,739 | 2,667
Income (loss) before income tax and noncontrolling interests | 306 | 248 | 736 | 661
Net income (loss) | 180 | 147 | 437 | 394
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests | 9 | (22) | 2 | (18)
Investment gains (losses) included in net income (loss) | 5 | (14) | 1 | (11)
CNA Financial [Member] | Property and Casualty [Member] | Commercial [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 913 | 767 | 2,591 | 2,545
Income (loss) before income tax and noncontrolling interests | 186 | 83 | 427 | 391
Net income (loss) | 110 | 49 | 252 | 231
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests | 12 | (29) | 2 | (23)
Investment gains (losses) included in net income (loss) | 7 | (16) | 1 | (13)
CNA Financial [Member] | Property and Casualty [Member] | International [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 229 | 216 | 658 | 642
Income (loss) before income tax and noncontrolling interests | 33 | 23 | 16 | 71
Net income (loss) | 22 | 9 | 9 | 37
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests | 6 | (1) | 14 | 1
Investment gains (losses) included in net income (loss) | 4 |  | 10 | 1
Diamond Offshore [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 350 | 608 | 1,211 | 1,867
Income (loss) before income tax and noncontrolling interests | 36 | 139 | (538) | (42)
Net income (loss) | 7 | 47 | (240) | (34)
Boardwalk Pipeline [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 306 | 296 | 961 | 925
Income (loss) before income tax and noncontrolling interests | 46 | 48 | 210 | 163
Net income (loss) | 14 | 18 | 62 | 55
Loews Hotels [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 161 | 146 | 513 | 452
Income (loss) before income tax and noncontrolling interests | 4 | 1 | 17 | 25
Net income (loss) | 3 | 2 | 7 | 15
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 37 | (34) | 98 | 6
Income (loss) before income tax and noncontrolling interests | (6) | (74) | (38) | (111)
Net income (loss) | $ (5) | $ (46) | (22) | $ (70)
Investment gains (losses) included in Revenues and Income (loss) before income tax and noncontrolling interests |  |  | (12) |
Investment gains (losses) included in net income (loss) |  |  | $ (4) |

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