Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Premiums earned	$ 38,577	$ 36,513	$ 34,678
Net investment income	3,159	3,240	3,401
Realized capital gains and losses:
Total other-than-temporary impairment (“OTTI”) losses	(48)	(13)	(146)
OTTI losses reclassified to (from) other comprehensive income (OCI)	1	(1)	(4)
Net OTTI losses recognized in earnings	(47)	(14)	(150)
Sales and valuation changes on equity investments and derivatives	1,932	(863)	595
Total realized capital gains and losses	1,885	(877)	445
Total revenues	44,675	39,815	39,407
Costs and expenses
Property and casualty insurance claims and claims expense (net of reinsurance ceded and indemnification programs of $524, $1,378 and $1,807)	23,976	22,778	21,847
Life contract benefits (net of reinsurance ceded of $165, $240 and $179)	2,039	1,973	1,923
Interest credited to contractholder funds (net of reinsurance ceded of $20, $24 and $25)	640	654	690
Amortization of deferred policy acquisition costs	5,533	5,222	4,784
Operating costs and expenses	5,690	5,594	5,196
Pension and other postretirement remeasurement gains and losses	114	468	(217)
Restructuring and related charges	41	67	96
Amortization of purchased intangibles	126	105	99
Impairment of goodwill and purchased intangibles	106	0	125
Interest expense	327	332	335
Total costs and expenses	38,592	37,193	34,878
Gain on disposition of operations	6	6	20
Income from operations before income tax expense	6,089	2,628	4,549
Income tax expense	1,242	468	995
Net income	4,847	2,160	3,554
Preferred stock dividends	169	148	116
Net income applicable to common shareholders	$ 4,678	$ 2,012	$ 3,438
Earnings per common share:
Net income applicable to common shareholders earnings per common share - Basic (in dollars per share)	$ 14.25	$ 5.78	$ 9.50
Weighted average common shares - Basic (in shares)	328.2	347.8	362.0
Net income applicable to common shareholders earnings per common share - Diluted (in dollars per share)	$ 14.03	$ 5.70	$ 9.35
Weighted average common shares - Diluted (in shares)	333.5	353.2	367.8
Property and casualty insurance
Revenues
Premiums earned	$ 36,076	$ 34,048	$ 32,300
Life insurance
Revenues
Premiums earned	1,512	1,482	1,447
Insurance commissions and fees	2,501	2,465	2,378
Other revenue
Revenues
Insurance commissions and fees	$ 1,054	$ 939	$ 883