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Consolidated Statement of Changes in Equity (Unaudited) - USD ($) $ in Millions | Total | Total | Common Shares | Common Stock and Capital Surplus | Retained Earnings | Accumulated Other Comp. Income (Loss) | Noncontrolling interests
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of accounting change |  | $ 4 | $ 4 |  |  | $ 225 | $ (221) |
Beginning Balance, shares at Dec. 31, 2017 |  |  |  | 88,275,460 |  |  |  |
Beginning Balance at Dec. 31, 2017 |  | 5,331 | 5,330 |  | $ 1,269 | 3,248 | 813 | $ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net earnings (losses) attributable to parent |  | 355 | 355 |  |  | 355 |  |
Net earnings (losses) including portion attributable to nonredeemable noncontrolling interest |  | 354 |  |  |  |  |  | (1)
Other comprehensive income (loss), attributable to parent |  |  | (445) |  |  |  | (445) |
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest |  | (445) |  |  |  |  |  |
Dividends |  | (196) | (196) |  |  | (196) |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 531,726 |  |  |  |
Exercise of stock options |  | 19 | 19 |  | 19 |  |  |
Restricted stock awards, shares |  |  |  | 200,625 |  |  |  |
Other benefit plans, shares |  |  |  | 73,676 |  |  |  |
Other benefit plans |  | 8 | 8 |  | 8 |  |  |
Dividend reinvestment plan, shares |  |  |  | 18,006 |  |  |  |
Dividend reinvestment plan |  | 2 | 2 |  | 2 |  |  |
Stock-based compensation expense |  | 11 | 11 |  | 11 |  |  |
Shares exchanged — benefit plans, shares |  |  |  | (24,310) |  |  |  |
Shares exchanged — benefit plans |  | 2 | 2 |  |  | 2 |  |
Forfeitures of restricted stock, shares |  |  |  | (3,069) |  |  |  |
Other |  | (2) | (2) |  |  | (2) |  | 0
Ending Balance, shares at Jun. 30, 2018 |  |  |  | 89,072,114 |  |  |  |
Ending Balance at Jun. 30, 2018 |  | 5,084 | 5,084 |  | 1,309 | 3,628 | 147 | 0
Beginning Balance, Redeemable Noncontrolling Interests at Dec. 31, 2017 |  | 3 |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Net earnings attributable to redeemable noncontrolling interests |  | (5) |  |  |  |  |  |
Other |  | 2 |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Jun. 30, 2018 |  | 0 |  |  |  |  |  |
Beginning Balance, shares at Mar. 31, 2018 |  |  |  | 88,881,213 |  |  |  |
Beginning Balance at Mar. 31, 2018 |  | 5,183 | 5,183 |  | 1,294 | 3,584 | 305 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net earnings (losses) attributable to parent |  | 210 | 210 |  |  | 210 |  |
Net earnings (losses) including portion attributable to nonredeemable noncontrolling interest |  | 210 |  |  |  |  |  | 0
Other comprehensive income (loss), attributable to parent |  |  | (158) |  |  |  | (158) |
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest |  | (158) |  |  |  |  |  |
Dividends |  | (165) | (165) |  |  | (165) |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 157,412 |  |  |  |
Exercise of stock options |  | 5 | 5 |  | 5 |  |  |
Restricted stock awards, shares |  |  |  | 0 |  |  |  |
Other benefit plans, shares |  |  |  | 21,093 |  |  |  |
Other benefit plans |  | 2 | 2 |  | 2 |  |  |
Dividend reinvestment plan, shares |  |  |  | 15,227 |  |  |  |
Dividend reinvestment plan |  | 2 | 2 |  | 2 |  |  |
Stock-based compensation expense |  | 6 | 6 |  | 6 |  |  |
Shares exchanged — benefit plans, shares |  |  |  | (428) |  |  |  |
Shares exchanged — benefit plans |  | 1 | 1 |  | 0 | 1 |  |
Forfeitures of restricted stock, shares |  |  |  | (2,403) |  |  |  |
Other |  | (2) | (2) |  |  | (2) |  | 0
Ending Balance, shares at Jun. 30, 2018 |  |  |  | 89,072,114 |  |  |  |
Ending Balance at Jun. 30, 2018 |  | 5,084 | 5,084 |  | 1,309 | 3,628 | 147 | 0
Beginning Balance, Redeemable Noncontrolling Interests at Mar. 31, 2018 |  | 0 |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Net earnings attributable to redeemable noncontrolling interests |  | 2 |  |  |  |  |  |
Other |  | 2 |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Jun. 30, 2018 |  | $ 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of accounting change | [1] |  |  |  |  |  | 0 |
Beginning Balance, shares at Dec. 31, 2018 |  | 89,291,724 |  | 89,291,724 |  |  |  |
Beginning Balance at Dec. 31, 2018 |  | $ 4,972 | 4,970 |  | 1,334 | 3,588 | 48 | 2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net earnings (losses) attributable to parent |  | 539 | 539 |  |  | 539 |  |
Net earnings (losses) including portion attributable to nonredeemable noncontrolling interest |  | 539 |  |  |  |  |  | 0
Other comprehensive income (loss), attributable to parent |  |  | 761 |  |  |  | 761 |
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest |  | 761 |  |  |  |  |  |
Dividends |  | (206) | (206) |  |  | (206) |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 400,006 |  |  |  |
Exercise of stock options |  | 17 | 17 |  | 17 |  |  |
Restricted stock awards, shares |  |  |  | 232,565 |  |  |  |
Other benefit plans, shares |  |  |  | 41,143 |  |  |  |
Other benefit plans |  | 4 | 4 |  | 4 |  |  |
Dividend reinvestment plan, shares |  |  |  | 9,489 |  |  |  |
Dividend reinvestment plan |  | 1 | 1 |  | 1 |  |  |
Stock-based compensation expense |  | 12 | 12 |  | 12 |  |  |
Shares exchanged — benefit plans, shares |  |  |  | (46,989) |  |  |  |
Shares exchanged — benefit plans |  | 5 | 5 |  | 1 | 4 |  |
Forfeitures of restricted stock, shares |  |  |  | (10,337) |  |  |  |
Other |  | $ (5) | (3) |  |  | (3) |  | (2)
Ending Balance, shares at Jun. 30, 2019 |  | 89,917,601 |  | 89,917,601 |  |  |  |
Ending Balance at Jun. 30, 2019 |  | $ 6,090 | 6,090 |  | 1,367 | 3,914 | 809 | 0
Beginning Balance, Redeemable Noncontrolling Interests at Dec. 31, 2018 |  | 0 |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Net earnings attributable to redeemable noncontrolling interests |  | (4) |  |  |  |  |  |
Other comprehensive income (loss) attributable to redeemable noncontrolling interests |  | 1 |  |  |  |  |  |
Other |  | 3 |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Jun. 30, 2019 |  | 0 |  |  |  |  |  |
Beginning Balance, shares at Mar. 31, 2019 |  |  |  | 89,637,713 |  |  |  |
Beginning Balance at Mar. 31, 2019 |  | 5,665 | 5,665 |  | 1,346 | 3,875 | 444 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net earnings (losses) attributable to parent |  | 210 | 210 |  |  | 210 |  |
Net earnings (losses) including portion attributable to nonredeemable noncontrolling interest |  | 210 |  |  |  |  |  | 0
Other comprehensive income (loss), attributable to parent |  |  | 365 |  |  |  | 365 |
Other comprehensive income (loss) including portion attributable to nonredeemable noncontrolling interest |  | 365 |  |  |  |  |  |
Dividends |  | (170) | (170) |  |  | (170) |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 247,753 |  |  |  |
Exercise of stock options |  | 11 | 11 |  | 11 |  |  |
Restricted stock awards, shares |  |  |  | 0 |  |  |  |
Other benefit plans, shares |  |  |  | 30,081 |  |  |  |
Other benefit plans |  | 3 | 3 |  | 3 |  |  |
Dividend reinvestment plan, shares |  |  |  | 7,596 |  |  |  |
Dividend reinvestment plan |  | 1 | 1 |  | 1 |  |  |
Stock-based compensation expense |  | 6 | 6 |  | 6 |  |  |
Shares exchanged — benefit plans, shares |  |  |  | (3,519) |  |  |  |
Shares exchanged — benefit plans |  | 1 | 1 |  | 0 | 1 |  |
Forfeitures of restricted stock, shares |  |  |  | (2,023) |  |  |  |
Other |  | $ 0 |  |  |  | 0 |  | 0
Ending Balance, shares at Jun. 30, 2019 |  | 89,917,601 |  | 89,917,601 |  |  |  |
Ending Balance at Jun. 30, 2019 |  | $ 6,090 | $ 6,090 |  | $ 1,367 | $ 3,914 | 809 | $ 0
Beginning Balance, Redeemable Noncontrolling Interests at Mar. 31, 2019 |  | 0 |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Net earnings attributable to redeemable noncontrolling interests |  | (1) |  |  |  |  |  |
Other comprehensive income (loss) attributable to redeemable noncontrolling interests |  | 1 |  |  |  |  |  |
Other |  | 0 |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Jun. 30, 2019 |  | $ 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of accounting change | [1] |  |  |  |  |  | $ 0 |
[1] | On January 1, 2018, AFG adopted new guidance that requires all equity securities other than those accounted for under the equity method to be reported at fair value with holding gains and losses recognized in net earnings. At the date of adoption, the $221 million net unrealized gain on equity securities classified as available for sale (with unrealized holding gains and losses reported in AOCI) under the prior guidance was reclassified from AOCI to retained earnings as the cumulative effect of an accounting change.

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- Definition Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Value, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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- Definition Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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