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Consolidating Financial Information - Consolidating Balance Sheet Information (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets: |  |  |  |
Investments | $ 52,385 | $ 49,400 |  |
Cash | 344 | 440 | $ 328 | $ 364
Receivables | 7,853 | 8,041 |  |
Property, plant and equipment | 15,200 | 15,477 |  |
Goodwill | 347 | 351 |  |
Other assets | 1,760 | 1,699 |  |
Deferred acquisition costs of insurance subsidiaries | 619 | 598 |  |
Total assets | 78,508 | 76,006 |  |
Liabilities and Equity: |  |  |  |
Insurance reserves | 37,753 | 36,486 |  |
Payable to brokers | 451 | 567 |  |
Short term debt | 185 | 1,040 |  |
Long term debt | 10,737 | 9,520 |  |
Deferred income taxes | 735 | 382 |  |
Other liabilities | 5,241 | 5,201 |  |
Total liabilities | 55,102 | 53,196 |  |
Total shareholders' equity | 18,270 | 17,561 |  |
Noncontrolling interests | 5,136 | 5,249 |  |
Total equity | 23,406 | 22,810 | $ 24,153 | $ 24,650
Total liabilities and equity | 78,508 | 76,006 |  |
Eliminations [Member] |  |  |  |
Assets: |  |  |  |
Receivables | (70) | 24 |  |
Deferred income taxes | (302) | (733) |  |
Investments in capital stocks of subsidiaries | (15,250) | (15,129) |  |
Other assets | 14 | 17 |  |
Total assets | (15,608) | (15,821) |  |
Liabilities and Equity: |  |  |  |
Deferred income taxes | (288) | (712) |  |
Other liabilities | (70) | 20 |  |
Total liabilities | (358) | (692) |  |
Total shareholders' equity | (15,250) | (15,129) |  |
Total equity | (15,250) | (15,129) |  |
Total liabilities and equity | (15,608) | (15,821) |  |
CNA Financial [Member] | Operating Segments [Member] |  |  |  |
Assets: |  |  |  |
Investments | 46,980 | 44,699 |  |
Cash | 290 | 387 |  |
Receivables | 7,389 | 7,384 |  |
Property, plant and equipment | 281 | 333 |  |
Deferred income taxes | 241 | 662 |  |
Goodwill | 110 | 114 |  |
Other assets | 924 | 848 |  |
Deferred acquisition costs of insurance subsidiaries | 619 | 598 |  |
Total assets | 56,834 | 55,025 |  |
Liabilities and Equity: |  |  |  |
Insurance reserves | 37,753 | 36,486 |  |
Payable to brokers | 234 | 358 |  |
Short term debt | 1 | 351 |  |
Long term debt | 2,713 | 2,213 |  |
Deferred income taxes | 3 | 5 |  |
Other liabilities | 3,960 | 3,883 |  |
Total liabilities | 44,664 | 43,296 |  |
Total shareholders' equity | 10,915 | 10,516 |  |
Noncontrolling interests | 1,255 | 1,213 |  |
Total equity | 12,170 | 11,729 |  |
Total liabilities and equity | 56,834 | 55,025 |  |
Diamond Offshore [Member] | Operating Segments [Member] |  |  |  |
Assets: |  |  |  |
Investments | 76 | 117 |  |
Cash | 5 | 13 |  |
Receivables | 278 | 409 |  |
Property, plant and equipment | 5,820 | 6,382 |  |
Other assets | 231 | 233 |  |
Total assets | 6,410 | 7,154 |  |
Liabilities and Equity: |  |  |  |
Short term debt | 182 | 287 |  |
Long term debt | 1,981 | 1,980 |  |
Deferred income taxes | 164 | 276 |  |
Other liabilities | 451 | 496 |  |
Total liabilities | 2,778 | 3,039 |  |
Total shareholders' equity | 1,936 | 2,195 |  |
Noncontrolling interests | 1,696 | 1,920 |  |
Total equity | 3,632 | 4,115 |  |
Total liabilities and equity | 6,410 | 7,154 |  |
Boardwalk Pipeline [Member] | Operating Segments [Member] |  |  |  |
Assets: |  |  |  |
Investments | 105 |  |  |
Cash | 7 | 4 |  |
Receivables | 93 | 93 |  |
Property, plant and equipment | 7,954 | 7,712 |  |
Goodwill | 237 | 237 |  |
Other assets | 319 | 319 |  |
Total assets | 8,715 | 8,365 |  |
Liabilities and Equity: |  |  |  |
Long term debt | 3,627 | 3,458 |  |
Deferred income taxes | 807 | 766 |  |
Other liabilities | 546 | 510 |  |
Total liabilities | 4,980 | 4,734 |  |
Total shareholders' equity | 1,552 | 1,517 |  |
Noncontrolling interests | 2,183 | 2,114 |  |
Total equity | 3,735 | 3,631 |  |
Total liabilities and equity | 8,715 | 8,365 |  |
Loews Hotels [Member] | Operating Segments [Member] |  |  |  |
Assets: |  |  |  |
Investments | 98 | 81 |  |
Cash | 18 | 12 |  |
Receivables | 25 | 35 |  |
Property, plant and equipment | 1,102 | 1,003 |  |
Deferred income taxes | 3 | 3 |  |
Other assets | 268 | 282 |  |
Total assets | 1,514 | 1,416 |  |
Liabilities and Equity: |  |  |  |
Short term debt | 2 | 2 |  |
Long term debt | 642 | 590 |  |
Deferred income taxes | 49 | 47 |  |
Other liabilities | 72 | 70 |  |
Total liabilities | 765 | 709 |  |
Total shareholders' equity | 747 | 705 |  |
Noncontrolling interests | 2 | 2 |  |
Total equity | 749 | 707 |  |
Total liabilities and equity | 1,514 | 1,416 |  |
Corporate and Other [Member] |  |  |  |
Assets: |  |  |  |
Investments | 5,126 | 4,503 |  |
Cash | 24 | 24 |  |
Receivables | 138 | 96 |  |
Property, plant and equipment | 43 | 47 |  |
Deferred income taxes | 58 | 68 |  |
Investments in capital stocks of subsidiaries | 15,250 | 15,129 |  |
Other assets | 4 |  |  |
Total assets | 20,643 | 19,867 |  |
Liabilities and Equity: |  |  |  |
Payable to brokers | 217 | 209 |  |
Short term debt |  | 400 |  |
Long term debt | 1,774 | 1,279 |  |
Other liabilities | 282 | 222 |  |
Total liabilities | 2,273 | 2,110 |  |
Total shareholders' equity | 18,370 | 17,757 |  |
Total equity | 18,370 | 17,757 |  |
Total liabilities and equity | $ 20,643 | $ 19,867 |  |

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