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Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Other Comprehensive Income [Abstract]
Net earnings	$ 842	$ 887	$ 852
Other comprehensive income (loss)	190	79	224
Comprehensive income	1,032	966	1,076
AFG
Statement of Other Comprehensive Income [Abstract]
Net earnings	842	887	852
Other comprehensive income (loss)	190	79	224
Comprehensive income	$ 1,032	$ 966	$ 1,076

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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