Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 3,271	$ 2,099	$ 5,729	$ 2,695
Changes in:
Unrealized net capital gains and losses	142	387	(376)	807
Unrealized foreign currency translation adjustments	(43)	84	(71)	39
Unamortized pension and other postretirement prior service credit	0	0	(1)	0
Discount rate for reserve for future policy benefits	0	(19)	0	(14)
Other comprehensive income (loss), after-tax	99	452	(448)	832
Comprehensive income	3,370	2,551	5,281	3,527
Less: Comprehensive (loss) income attributable to noncontrolling interest	0	(11)	1	(6)
Comprehensive income attributable to Allstate	$ 3,370	$ 2,562	$ 5,280	$ 3,533

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