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Shareholders' Equity - Progression of the components of accumulated other comprehensive income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
AOCI beginning balance |  |  |  |  |  | $ 48 |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | $ 366 |  | $ (158) |  | 762 |  | $ (445) |  |  |  |
Cumulative effect of accounting change |  |  |  |  |  |  |  |  |  |  |  | $ 4
AOCI ending balance |  | 809 |  |  |  | 809 |  |  |  |  |  |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, Pretax |  | 450 |  | (187) |  | 937 |  | (540) |  |  |  |
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, tax |  | (94) |  | 39 |  | (197) |  | 113 |  |  |  |
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, net of tax |  | 356 |  | (148) |  | 740 |  | (427) |  |  |  |
Reclassification from accumulated other comprehensive income, pretax | [1] | (10) |  | (4) |  | (14) |  | (2) |  |  |  |
Reclassification from accumulated other comprehensive income, tax | [1] | 2 |  | 1 |  | 3 |  | 1 |  |  |  |
Reclassification from accumulated other comprehensive income, net of tax |  | (8) |  | (3) |  | (11) |  | (1) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), pretax |  | 440 |  | (191) |  | 923 |  | (542) |  |  |  |
Other comprehensive income (loss), tax |  | (92) |  | 40 |  | (194) |  | 114 |  |  |  |
Other comprehensive income (loss), net of tax |  | 348 |  | (151) |  | 729 |  | (428) |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Reclassification from accumulated other comprehensive income, net of tax | [1] | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, net of tax |  | 356 |  | (148) |  | 740 |  | (427) |  |  |  |
Reclassification from accumulated other comprehensive income, net of tax |  | (8) |  | (3) |  | (11) |  | (1) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
AOCI beginning balance |  | 464 | [2] | 342 |  | 83 | [2] | 840 |  |  |  |
Other comprehensive income (loss), net of tax |  | 348 |  | (151) |  | 729 |  | (428) |  |  |  |
Cumulative effect of accounting change | [3] | 0 |  | 0 |  | 0 |  | 0 |  | $ (221) |  |
AOCI ending balance |  | 812 | [2] | 191 |  | 812 | [2] | 191 |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), pretax |  | 23 |  | (4) |  | 37 |  | (18) |  |  |  |
Other comprehensive income (loss), tax |  | (5) |  | 1 |  | (8) |  | 4 |  |  |  |
Other comprehensive income (loss), net of tax |  | 18 |  | (3) |  | 29 |  | (14) |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
AOCI beginning balance |  | 0 |  | (24) |  | (11) |  | (13) |  |  |  |
Other comprehensive income (loss), net of tax |  | 18 |  | (3) |  | 29 |  | (14) |  |  |  |
Cumulative effect of accounting change | [3] | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |
AOCI ending balance |  | 18 |  | (27) |  | 18 |  | (27) |  |  |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), pretax |  | (1) |  | (4) |  | 3 |  | (2) |  |  |  |
Other comprehensive income (loss), tax |  | 1 |  | 0 |  | 1 |  | (1) |  |  |  |
Other comprehensive income (loss), net of tax |  | 0 |  | (4) |  | 4 |  | (3) |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | (1) |  | 0 |  | (1) |  | 0 |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
AOCI beginning balance |  | (12) |  | (5) |  | (16) |  | (6) |  |  |  |
Other comprehensive income (loss), net of tax |  | (1) |  | (4) |  | 3 |  | (3) |  |  |  |
Cumulative effect of accounting change | [3] | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |
AOCI ending balance |  | (13) |  | (9) |  | (13) |  | (9) |  |  |  |
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), pretax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Other comprehensive income (loss), tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Other comprehensive income (loss), net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
AOCI beginning balance |  | (8) |  | (8) |  | (8) |  | (8) |  |  |  |
Other comprehensive income (loss), net of tax |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |
Cumulative effect of accounting change | [3] | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |
AOCI ending balance |  | (8) |  | (8) |  | (8) |  | (8) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), pretax |  | 462 |  | (199) |  | 963 |  | (562) |  |  |  |
Other comprehensive income (loss), tax |  | (96) |  | 41 |  | (201) |  | 117 |  |  |  |
Other comprehensive income (loss), net of tax |  | 366 |  | (158) |  | 762 |  | (445) |  |  |  |
AOCI Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | (1) |  | 0 |  | (1) |  | 0 |  |  |  |
AOCI Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
AOCI beginning balance |  | 444 |  | 305 |  | 48 |  | 813 |  |  |  |
Other comprehensive income (loss), net of tax |  | 365 |  | (158) |  | 761 |  | (445) |  |  |  |
Cumulative effect of accounting change |  | 0 | [3] | 0 | [3] | 0 | [3] | 0 | [3] | $ (221) | [3] | $ (221)
AOCI ending balance |  | $ 809 |  | $ 147 |  | $ 809 |  | $ 147 |  |  |  |
[1] | The reclassification adjustment out of net unrealized gains (losses) on securities affected the following lines in AFG’s Statement of Earnings:
| OCI component |  | Affected line in the statement of earnings |
| Pretax |  | Realized gains (losses) on securities |
| Tax |  | Provision for income taxes |
[2] | Includes net unrealized gains of $59 million at June 30, 2019 compared to $61 million at March 31, 2019 and $58 million at December 31, 2018 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.
[3] | 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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