Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Net investment income	$ 708	$ 246
Realized capital gains (losses)	426	(162)
Total revenues	12,451	9,866
Costs and expenses
Property and casualty insurance claims and claims expense	6,043	5,341
Shelter-in-Place Payback expense	0	210
Accident and health insurance policy benefits	233	141
Interest credited to contractholder funds	9	9
Amortization of deferred policy acquisition costs	1,523	1,365
Operating costs and expenses	1,731	1,338
Pension and other postretirement remeasurement (gains) losses	(310)	318
Restructuring and related charges	51	4
Amortization of purchased intangibles	53	28
Interest expense	86	81
Total costs and expenses	9,419	8,835
Income from operations before income tax expense	3,032	1,031
Income tax expense	626	194
Net income from continuing operations	2,406	837
Loss from discontinued operations, net of tax	(3,793)	(288)
Net (loss) income	(1,387)	549
Less: Net loss attributable to noncontrolling interest	(6)	0
Net (loss) income attributable to Allstate	(1,381)	549
Less: Preferred stock dividends	27	36
Net (loss) income applicable to common shareholders	$ (1,408)	$ 513
Basic
Earnings per common share - Continuing operations basic (in dollars per share)	$ 7.88	$ 2.52
Earnings per common share - Discontinued operations basic (in dollars per share)	(12.53)	(0.90)
Earnings per common share - Basic (in dollars per share)	(4.65)	1.62
Diluted
Earnings per common share - Continuing operations diluted (in dollars per share)	7.78	2.48
Earnings per common share - Discontinued operations diluted (in dollars per share)	(12.38)	(0.89)
Earnings per common share - Diluted (in dollars per share)	$ (4.60)	$ 1.59
Weighted average common shares - Basic (in shares)	302.5	317.4
Weighted average common shares - Diluted (in shares)	306.4	322.4
Property and casualty insurance premiums
Revenues
Property and casualty insurance premiums	$ 10,307	$ 9,235
Accident and health insurance premiums and contract charges
Revenues
Insurance premiums, commissions and fees	455	282
Other revenue
Revenues
Insurance premiums, commissions and fees	$ 555	$ 265