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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Significant components of the Company's continuing operations and selected balance sheet items | The Company's results of operations and selected balance sheet items by segment are presented in the following tables.
Year ended December 31, 2017 | Specialty |  | Commercial |  | International |  | Life & Group |  | Corporate & Other |  |  |  |
(In millions) |  |  |  |  |  | Eliminations |  | Total
Net written premiums | $ | 2,771 |  |  | $ | 2,882 |  |  | $ | 881 |  |  | $ | 536 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 7,069 |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums | $ | 2,753 |  |  | $ | 2,840 |  |  | $ | 857 |  |  | $ | 539 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 6,988 |
Net investment income | 538 |  |  | 642 |  |  | 52 |  |  | 782 |  |  | 20 |  |  | — |  |  | 2,034 |
Other revenues | 392 |  |  | 31 |  |  | — |  |  | 2 |  |  | 2 |  |  | — |  |  | 427 |
Total operating revenues | 3,683 |  |  | 3,513 |  |  | 909 |  |  | 1,323 |  |  | 22 |  |  | (1 | ) |  | 9,449 |
Claims, Benefits and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net incurred claims and benefits | 1,535 |  |  | 1,928 |  |  | 575 |  |  | 1,269 |  |  | (19 | ) |  | — |  |  | 5,288 |
Policyholders’ dividends | 4 |  |  | 18 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 22 |
Amortization of deferred acquisition costs | 596 |  |  | 475 |  |  | 162 |  |  | — |  |  | — |  |  | — |  |  | 1,233 |
Other insurance related expenses | 286 |  |  | 523 |  |  | 162 |  |  | 129 |  |  | (1 | ) |  | (1 | ) |  | 1,098 |
Other expenses | 342 |  |  | 57 |  |  | (7 | ) |  | 7 |  |  | 192 |  |  | — |  |  | 591 |
Total claims, benefits and expenses | 2,763 |  |  | 3,001 |  |  | 892 |  |  | 1,405 |  |  | 172 |  |  | (1 | ) |  | 8,232 |
Core income (loss) before income tax | 920 |  |  | 512 |  |  | 17 |  |  | (82 | ) |  | (150 | ) |  | — |  |  | 1,217 |
Income tax (expense) benefit on core income (loss) | (310 | ) |  | (171 | ) |  | (9 | ) |  | 132 |  |  | 60 |  |  | — |  |  | (298 | )
Core income (loss) | $ | 610 |  |  | $ | 341 |  |  | $ | 8 |  |  | $ | 50 |  |  | $ | (90 | ) |  | $ | — |  |  | 919 |
Net realized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | 93 |
Income tax (expense) benefit on net realized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | (30 | )
Net realized investment gains (losses), after tax |  |  |  |  |  |  |  |  |  |  |  |  | 63 |
Net deferred tax asset remeasurement |  |  |  |  |  |  |  |  |  |  |  |  | (83 | )
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ | 899 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance receivables | $ | 678 |  |  | $ | 647 |  |  | $ | 212 |  |  | $ | 438 |  |  | $ | 2,315 |  |  | $ | — |  |  | $ | 4,290 |
Insurance receivables | 984 |  |  | 1,088 |  |  | 254 |  |  | 8 |  |  | 2 |  |  | — |  |  | 2,336 |
Deferred acquisition costs | 319 |  |  | 222 |  |  | 93 |  |  | — |  |  | — |  |  | — |  |  | 634 |
Goodwill | 117 |  |  | — |  |  | 31 |  |  | — |  |  | — |  |  | — |  |  | 148 |
Insurance reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claim and claim adjustment expenses | 5,848 |  |  | 8,585 |  |  | 1,636 |  |  | 3,499 |  |  | 2,436 |  |  | — |  |  | 22,004 |
Unearned premiums | 2,035 |  |  | 1,394 |  |  | 472 |  |  | 128 |  |  | — |  |  | — |  |  | 4,029 |
Future policy benefits | — |  |  | — |  |  | — |  |  | 11,179 |  |  | — |  |  | — |  |  | 11,179 |
Year ended December 31, 2016 | Specialty |  | Commercial |  | International |  | Life & Group |  | Corporate & Other |  |  |  |
(In millions) |  |  |  |  | Eliminations |  | Total
Net written premiums | $ | 2,780 |  |  | $ | 2,841 |  |  | $ | 821 |  |  | $ | 547 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 6,988 |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums | $ | 2,779 |  |  | $ | 2,804 |  |  | $ | 806 |  |  | $ | 536 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 6,924 |
Net investment income | 516 |  |  | 638 |  |  | 51 |  |  | 767 |  |  | 16 |  |  | — |  |  | 1,988 |
Other revenues | 362 |  |  | 32 |  |  | — |  |  | (2 | ) |  | 12 |  |  | — |  |  | 404 |
Total operating revenues | 3,657 |  |  | 3,474 |  |  | 857 |  |  | 1,301 |  |  | 28 |  |  | (1 | ) |  | 9,316 |
Claims, Benefits and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net incurred claims and benefits | 1,467 |  |  | 1,927 |  |  | 492 |  |  | 1,286 |  |  | 98 |  |  | — |  |  | 5,270 |
Policyholders’ dividends | 4 |  |  | 9 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13 |
Amortization of deferred acquisition costs | 591 |  |  | 470 |  |  | 174 |  |  | — |  |  | — |  |  | — |  |  | 1,235 |
Other insurance related expenses | 301 |  |  | 560 |  |  | 133 |  |  | 132 |  |  | (3 | ) |  | (1 | ) |  | 1,122 |
Other expenses | 312 |  |  | 36 |  |  | 24 |  |  | 8 |  |  | 209 |  |  | — |  |  | 589 |
Total claims, benefits and expenses | 2,675 |  |  | 3,002 |  |  | 823 |  |  | 1,426 |  |  | 304 |  |  | (1 | ) |  | 8,229 |
Core income (loss) before income tax | 982 |  |  | 472 |  |  | 34 |  |  | (125 | ) |  | (276 | ) |  | — |  |  | 1,087 |
Income tax (expense) benefit on core income (loss) | (332 | ) |  | (161 | ) |  | (13 | ) |  | 145 |  |  | 98 |  |  | — |  |  | (263 | )
Core income (loss) | $ | 650 |  |  | $ | 311 |  |  | $ | 21 |  |  | $ | 20 |  |  | $ | (178 | ) |  | $ | — |  |  | 824 |
Net realized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | 50 |
Income tax (expense) benefit on net realized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | (15 | )
Net realized investment gains (losses), after tax |  |  |  |  |  |  |  |  |  |  |  |  | 35 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ | 859 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance receivables | $ | 760 |  |  | $ | 621 |  |  | $ | 131 |  |  | $ | 462 |  |  | $ | 2,479 |  |  | $ | — |  |  | $ | 4,453 |
Insurance receivables | 982 |  |  | 1,021 |  |  | 233 |  |  | 17 |  |  | 2 |  |  | — |  |  | 2,255 |
Deferred acquisition costs | 310 |  |  | 214 |  |  | 76 |  |  | — |  |  | — |  |  | — |  |  | 600 |
Goodwill | 117 |  |  | — |  |  | 28 |  |  | — |  |  | — |  |  | — |  |  | 145 |
Insurance reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claim and claim adjustment expenses | 6,149 |  |  | 8,894 |  |  | 1,328 |  |  | 3,358 |  |  | 2,614 |  |  | — |  |  | 22,343 |
Unearned premiums | 1,911 |  |  | 1,323 |  |  | 396 |  |  | 132 |  |  | — |  |  | — |  |  | 3,762 |
Future policy benefits | — |  |  | — |  |  | — |  |  | 10,326 |  |  | — |  |  | — |  |  | 10,326 |
Year ended December 31, 2015 | Specialty |  | Commercial |  |  |  | Life & Group |  | Corporate & Other |  |  |  |
(In millions) |  |  | International |  |  |  | Eliminations |  | Total
Net written premiums | $ | 2,781 |  |  | $ | 2,818 |  |  | $ | 822 |  |  | $ | 542 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 6,962 |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premiums | $ | 2,782 |  |  | $ | 2,788 |  |  | $ | 804 |  |  | $ | 548 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 6,921 |
Net investment income | 474 |  |  | 593 |  |  | 52 |  |  | 704 |  |  | 17 |  |  | — |  |  | 1,840 |
Other revenues | 356 |  |  | 37 |  |  | (1 | ) |  | 7 |  |  | 11 |  |  | (3 | ) |  | 407 |
Total operating revenues | 3,612 |  |  | 3,418 |  |  | 855 |  |  | 1,259 |  |  | 29 |  |  | (5 | ) |  | 9,168 |
Claims, Benefits and Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net incurred claims and benefits | 1,597 |  |  | 1,814 |  |  | 479 |  |  | 1,421 |  |  | 61 |  |  | — |  |  | 5,372 |
Policyholders’ dividends | 4 |  |  | 8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 12 |
Amortization of deferred acquisition costs | 589 |  |  | 469 |  |  | 168 |  |  | 314 |  |  | — |  |  | — |  |  | 1,540 |
Other insurance related expenses | 278 |  |  | 538 |  |  | 138 |  |  | 142 |  |  | (1 | ) |  | (2 | ) |  | 1,093 |
Other expenses | 301 |  |  | 28 |  |  | 12 |  |  | 11 |  |  | 186 |  |  | (3 | ) |  | 535 |
Total claims, benefits and expenses | 2,769 |  |  | 2,857 |  |  | 797 |  |  | 1,888 |  |  | 246 |  |  | (5 | ) |  | 8,552 |
Core income (loss) before income tax | 843 |  |  | 561 |  |  | 58 |  |  | (629 | ) |  | (217 | ) |  | — |  |  | 616 |
Income tax (expense) benefit on core income (loss) | (283 | ) |  | (192 | ) |  | (21 | ) |  | 315 |  |  | 80 |  |  | — |  |  | (101 | )
Core income (loss) | $ | 560 |  |  | $ | 369 |  |  | $ | 37 |  |  | $ | (314 | ) |  | $ | (137 | ) |  | $ | — |  |  | 515 |
Net realized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | (67 | )
Income tax (expense) benefit on net realized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  | 31 |
Net realized investment gains (losses), after tax |  |  |  |  |  |  |  |  |  |  |  |  | (36 | )
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ | 479 |
Revenues by line of business | The following table presents operating revenue by line of business for each reportable segment.
Years ended December 31 |  |  |  |  |
(In millions) | 2017 |  | 2016 |  | 2015
Specialty |  |  |  |  |
Management & Professional Liability | $ | 2,591 |  |  | $ | 2,617 |  |  | $ | 2,647 |
Surety | 541 |  |  | 529 |  |  | 504 |
Warranty & Alternative Risks | 551 |  |  | 511 |  |  | 461 |
Specialty revenues | 3,683 |  |  | 3,657 |  |  | 3,612 |
Commercial |  |  |  |  |  |  |  |
Middle Market | 1,907 |  |  | 1,768 |  |  | 1,641 |
Small Business | 480 |  |  | 582 |  |  | 621 |
Other Commercial Insurance | 1,126 |  |  | 1,124 |  |  | 1,156 |
Commercial revenues | 3,513 |  |  | 3,474 |  |  | 3,418 |
International |  |  |  |  |  |  |  |
Canada | 224 |  |  | 203 |  |  | 213 |
CNA Europe | 326 |  |  | 314 |  |  | 311 |
Hardy | 359 |  |  | 340 |  |  | 331 |
International revenues | 909 |  |  | 857 |  |  | 855 |
Life & Group revenues | 1,323 |  |  | 1,301 |  |  | 1,259 |
Corporate & Other revenues | 22 |  |  | 28 |  |  | 29 |
Eliminations | (1 | ) |  | (1 | ) |  | (5 | )
Total operating revenues | 9,449 |  |  | 9,316 |  |  | 9,168 |
Net realized investment gains (losses) (1) | 93 |  |  | 50 |  |  | (67 | )
Total revenues | $ | 9,542 |  |  | $ | 9,366 |  |  | $ | 9,101 |
(1) | 2017 Net realized investment gains (losses) includes a $42 million loss on the early redemption of the Company's $350 million senior notes due November 2019.

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