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Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Other Comprehensive Income [Abstract]
Net earnings attributable to shareholders	$ 166	$ 11	$ 145	$ 153	$ 385	$ 109	$ 54	$ 101	$ 475	$ 649	$ 352
Comprehensive income (loss) attributable to shareholders									771	711	(71)
AFG
Statement of Other Comprehensive Income [Abstract]
Net earnings attributable to shareholders									475	649	352
Other comprehensive income (loss), net of tax									296	62	(423)
Comprehensive income (loss) attributable to shareholders									$ 771	$ 711	$ (71)

X

- Definition

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.

+ References

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