Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Property-liability insurance premiums	$ 8,121	$ 7,869	$ 24,098	$ 23,406
Life and annuity premiums and contract charges	593	571	1,777	1,701
Net investment income	843	748	2,488	2,241
Realized capital gains and losses:
Total other-than-temporary impairment (“OTTI”) losses	(26)	(73)	(135)	(241)
OTTI losses reclassified to (from) other comprehensive income	(2)	0	(2)	8
Net OTTI losses recognized in earnings	(28)	(73)	(137)	(233)
Sales and other realized capital gains and losses	131	106	455	141
Total realized capital gains and losses	103	33	318	(92)
Total revenues	9,660	9,221	28,681	27,256
Costs and expenses
Property-liability insurance claims and claims expense	5,545	5,553	16,650	17,138
Life and annuity contract benefits	456	484	1,416	1,393
Interest credited to contractholder funds	174	183	522	558
Amortization of deferred policy acquisition costs	1,200	1,138	3,545	3,393
Operating costs and expenses	1,218	1,021	3,401	3,043
Restructuring and related charges	14	5	77	21
Interest expense	83	73	251	218
Costs and expenses	8,690	8,457	25,862	25,764
Gain on disposition of operations	1	1	15	4
Income from operations before income tax expense	971	765	2,834	1,496
Income tax expense	305	245	894	459
Net income	666	520	1,940	1,037
Preferred stock dividends	29	29	87	87
Net income applicable to common shareholders	$ 637	$ 491	$ 1,853	$ 950
Earnings per common share:
Net income available to common shareholders per common share - Basic (in dollars per share)	$ 1.76	$ 1.32	$ 5.10	$ 2.54
Weighted average common shares - Basic (in shares)	361.3	371.5	363.5	374.4
Net income available to common shareholders per common share - Diluted (in dollars per share)	$ 1.74	$ 1.31	$ 5.02	$ 2.51
Weighted average common shares - Diluted (in shares)	367.1	375.9	369.1	378.9
Cash dividends declared per common share (in dollars per share)	$ 0.37	$ 0.33	$ 1.11	$ 0.99