Business Segments (Tables)

6 Months Ended

Jun. 30, 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.

Three months ended June 30, 2017	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	689		$	705		$	206		$	135		$	—		$	(1	)	$	1,734
Net investment income	120			143			13			195			4			—			475
Other revenues	98			9			(1		)	—			1			—			107
Total operating revenues	907			857			218			330			5			(1		)	2,316
Claims, Benefits and Expenses
Net incurred claims and benefits	398			422			129			328			(2		)	—			1,275
Policyholders’ dividends	1			4			—			—			—			—			5
Amortization of deferred acquisition costs	149			118			45			—			—			—			312
Other insurance related expenses	72			128			31			32			(1		)	(1		)	261
Other expenses	82			11			(1		)	1			50			—			143
Total claims, benefits and expenses	702			683			204			361			47			(1		)	1,996
Operating income (loss) before income tax	205			174			14			(31		)	(42		)	—			320
Income tax (expense) benefit on operating income (loss)	(69		)	(59		)	(4		)	36			15			—			(81		)
Net operating income (loss)	136			115			10			5			(27		)	—			239
Net realized investment gains (losses)	14			19			7			7			3			—			50
Income tax (expense) benefit on net realized investment gains (losses)	(5		)	(6		)	(1		)	(3		)	(2		)	—			(17		)
Net realized investment gains (losses), after tax	9			13			6			4			1			—			33
Net income (loss)	$	145		$	128		$	16		$	9		$	(26	)	$	—		$	272

Three months ended June 30, 2016	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	702		$	696		$	197		$	136		$	—		$	(1	)	$	1,730
Net investment income	133			164			13			188			4			—			502
Other revenues	89			8			—			3			—			—			100
Total operating revenues	924			868			210			327			4			(1		)	2,332
Claims, Benefits and Expenses
Net incurred claims and benefits	377			469			157			340			(8		)	—			1,335
Policyholders’ dividends	1			3			—			—			—			—			4
Amortization of deferred acquisition costs	148			117			40			—			—			—			305
Other insurance related expenses	73			130			37			31			—			(1		)	270
Other expenses	79			11			7			2			47			—			146
Total claims, benefits and expenses	678			730			241			373			39			(1		)	2,060
Operating income (loss) before income tax	246			138			(31		)	(46		)	(35		)	—			272
Income tax (expense) benefit on operating income (loss)	(82		)	(46		)	4			42			11			—			(71		)
Net operating income (loss)	164			92			(27		)	(4		)	(24		)	—			201
Net realized investment gains (losses)	4			8			4			(2		)	2			—			16
Income tax (expense) benefit on net realized investment gains (losses)	(2		)	(3		)	(1		)	(3		)	1			—			(8		)
Net realized investment gains (losses), after tax	2			5			3			(5		)	3			—			8
Net income (loss)	$	166		$	97		$	(24	)	$	(9	)	$	(21	)	$	—		$	209

Six months ended June 30, 2017	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,353		$	1,356		$	403		$	268		$	—		$	(1	)	$	3,379
Net investment income	273			321			25			392			9			—			1,020
Other revenues	192			18			(1		)	1			1			—			211
Total operating revenues	1,818			1,695			427			661			10			(1		)	4,610
Claims, Benefits and Expenses
Net incurred claims and benefits	784			859			244			658			19			—			2,564
Policyholders’ dividends	2			7			—			—			—			—			9
Amortization of deferred acquisition costs	292			234			91			—			—			—			617
Other insurance related expenses	141			254			58			64			(1		)	(1		)	515
Other expenses	163			25			(7		)	3			94			—			278
Total claims, benefits and expenses	1,382			1,379			386			725			112			(1		)	3,983
Operating income (loss) before income tax	436			316			41			(64		)	(102		)	—			627
Income tax (expense) benefit on operating income (loss)	(146		)	(107		)	(11		)	73			38			—			(153		)
Net operating income (loss)	290			209			30			9			(64		)	—			474
Net realized investment gains (losses)	21			30			13			17			5			—			86
Income tax (expense) benefit on net realized investment gains (losses)	(8		)	(9		)	(2		)	(7		)	(2		)	—			(28		)
Net realized investment gains (losses), after tax	13			21			11			10			3			—			58
Net income (loss)	$	303		$	230		$	41		$	19		$	(61	)	$	—		$	532

June 30, 2017
(In millions)
Reinsurance receivables	$	880	$	591	$	150	$	461	$	2,382	$	—		$	4,464
Insurance receivables	1,020		1,129		290		11		2		—			2,452
Deferred acquisition costs	318		234		95		—		—		—			647
Goodwill	117		—		30		—		—		—			147
Insurance reserves
Claim and claim adjustment expenses	6,229		8,586		1,442		3,417		2,505		—			22,179
Unearned premiums	1,988		1,481		500		139		—		(1		)	4,107
Future policy benefits	—		—		—		10,824		—		—			10,824

Six months ended June 30, 2016	Specialty			Commercial			International			Life & Group Non-Core			Corporate & Other Non-Core
(In millions)																Eliminations			Total
Operating revenues
Net earned premiums	$	1,384		$	1,384		$	395		$	267		$	—		$	(1	)	$	3,429
Net investment income	240			290			25			375			7			—			937
Other revenues	176			14			1			3			3			—			197
Total operating revenues	1,800			1,688			421			645			10			(1		)	4,563
Claims, Benefits and Expenses
Net incurred claims and benefits	767			911			278			663			120			—			2,739
Policyholders’ dividends	2			6			—			—			—			—			8
Amortization of deferred acquisition costs	292			233			87			—			—			—			612
Other insurance related expenses	148			271			65			64			—			(1		)	547
Other expenses	154			16			16			5			101			—			292
Total claims, benefits and expenses	1,363			1,437			446			732			221			(1		)	4,198
Operating income (loss) before income tax	437			251			(25		)	(87		)	(211		)	—			365
Income tax (expense) benefit on operating income (loss)	(146		)	(85		)	4			81			73			—			(73		)
Net operating income (loss)	291			166			(21		)	(6		)	(138		)	—			292
Net realized investment gains (losses)	(7		)	(10		)	8			(5		)	(6		)	—			(20		)
Income tax (expense) benefit on net realized investment gains (losses)	2			3			(2		)	(3		)	3			—			3
Net realized investment gains (losses), after tax	(5		)	(7		)	6			(8		)	(3		)	—			(17		)
Net income (loss)	$	286		$	159		$	(15	)	$	(14	)	$	(141	)	$	—		$	275

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

Revenues by line of business

The following table presents revenue by line of business for each reportable segment. Revenues are comprised of operating revenues and net realized investment gains and losses.

Periods ended June 30	Three Months						Six Months
(In millions)	2017			2016			2017			2016
Specialty
Management & Professional Liability	$	646		$	659		$	1,307		$	1,277
Surety	137			133			260			260
Warranty & Alternative Risks	138			136			272			256
Specialty revenues	921			928			1,839			1,793
Commercial
Middle Market	462			434			920			835
Small Business	129			151			226			294
Other Commercial Insurance	285			291			579			549
Commercial revenues	876			876			1,725			1,678
International
Canada	53			51			104			101
CNA Europe	79			81			152			159
Hardy	93			82			184			169
International revenues	225			214			440			429
Life & Group Non-Core revenues	337			325			678			640
Corporate & Other Non-Core revenues	8			6			15			4
Eliminations	(1		)	(1		)	(1		)	(1		)
Total revenues	$	2,366		$	2,348		$	4,696		$	4,543