Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Property-liability insurance premiums	$ 8,018	$ 7,814	$ 15,977	$ 15,537
Life and annuity premiums and contract charges	591	564	1,184	1,130
Net investment income	897	762	1,645	1,493
Realized capital gains and losses:
Total other-than-temporary impairment (“OTTI”) losses	(47)	(77)	(109)	(168)
OTTI losses reclassified to (from) other comprehensive income	(3)	(2)	0	8
Net OTTI losses recognized in earnings	(50)	(79)	(109)	(160)
Sales and other realized capital gains and losses	131	103	324	35
Total realized capital gains and losses	81	24	215	(125)
Total revenues	9,587	9,164	19,021	18,035
Costs and expenses
Property-liability insurance claims and claims expense	5,689	5,901	11,105	11,585
Life and annuity contract benefits	486	454	960	909
Interest credited to contractholder funds	175	185	348	375
Amortization of deferred policy acquisition costs	1,176	1,126	2,345	2,255
Operating costs and expenses	1,086	1,040	2,183	2,022
Restructuring and related charges	53	11	63	16
Interest expense	83	72	168	145
Costs and expenses	8,748	8,789	17,172	17,307
Gain on disposition of operations	12	1	14	3
Income from operations before income tax expense	851	376	1,863	731
Income tax expense	272	105	589	214
Net income	579	271	1,274	517
Preferred stock dividends	29	29	58	58
Net income applicable to common shareholders	$ 550	$ 242	$ 1,216	$ 459
Earnings per common share:
Net income available to common shareholders per common share - Basic (in dollars per share)	$ 1.51	$ 0.65	$ 3.34	$ 1.22
Weighted average common shares - Basic (in shares)	363.6	373.6	364.6	375.8
Net income available to common shareholders per common share - Diluted (in dollars per share)	$ 1.49	$ 0.64	$ 3.29	$ 1.21
Weighted average common shares - Diluted (in shares)	369.0	378.1	370.1	380.5
Cash dividends declared per common share (in dollars per share)	$ 0.37	$ 0.33	$ 0.74	$ 0.66