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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
Stockholders' Equity Note [Abstract] |
Components of accumulated other comprehensive income (loss) | The progression of the components of accumulated other comprehensive income follows (in millions):
|  |  | Other Comprehensive Income |  |
| AOCI Beginning Balance |  | Pretax |  | Tax |  | Net of tax |  | Attributable to noncontrolling interests |  | Attributable to shareholders |  | AOCI Ending Balance
Quarter ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on securities arising during the period |  |  | $ | 92 |  |  | $ | (33 | ) |  | $ | 59 |  |  | $ | — |  |  | $ | 59 |  |  |  |
Reclassification adjustment for realized (gains) losses included in net earnings (a) |  |  | 12 |  |  | (4 | ) |  | 8 |  |  | — |  |  | 8 |  |  |  |
Total net unrealized gains on securities (b) | $ | 639 |  |  | 104 |  |  | (37 | ) |  | 67 |  |  | — |  |  | 67 |  |  | $ | 706 |
Net unrealized losses on cash flow hedges | (6 | ) |  | (1 | ) |  | 1 |  |  | — |  |  | — |  |  | — |  |  | (6 | )
Foreign currency translation adjustments | (11 | ) |  | 5 |  |  | 2 |  |  | 7 |  |  | — |  |  | 7 |  |  | (4 | )
Pension and other postretirement plans adjustments | (7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (7 | )
Total | $ | 615 |  |  | $ | 108 |  |  | $ | (34 | ) |  | $ | 74 |  |  | $ | — |  |  | $ | 74 |  |  | $ | 689 |
Quarter ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on securities arising during the period |  |  | $ | 138 |  |  | $ | (49 | ) |  | $ | 89 |  |  | $ | (1 | ) |  | $ | 88 |  |  |
Reclassification adjustment for realized (gains) losses included in net earnings (a) |  |  | (2 | ) |  | 1 |  |  | (1 | ) |  | — |  |  | (1 | ) |  |
Total net unrealized gains on securities | $ | 685 |  |  | 136 |  |  | (48 | ) |  | 88 |  |  | (1 | ) |  | 87 |  |  | $ | 772 |
Net unrealized gains (losses) on cash flow hedges | 5 |  |  | (1 | ) |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 5 |
Foreign currency translation adjustments | (15 | ) |  | (2 | ) |  | (1 | ) |  | (3 | ) |  | — |  |  | (3 | ) |  | (18 | )
Pension and other postretirement plans adjustments | (6 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6 | )
Total | $ | 669 |  |  | $ | 133 |  |  | $ | (48 | ) |  | $ | 85 |  |  | $ | (1 | ) |  | $ | 84 |  |  | $ | 753 |
Nine months ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on securities arising during the period |  |  | $ | 461 |  |  | $ | (162 | ) |  | $ | 299 |  |  | $ | — |  |  | $ | 299 |  |  |  |
Reclassification adjustment for realized (gains) losses included in net earnings (a) |  |  | 4 |  |  | (1 | ) |  | 3 |  |  | — |  |  | 3 |  |  |  |
Total net unrealized gains on securities (b) | $ | 404 |  |  | 465 |  |  | (163 | ) |  | 302 |  |  | — |  |  | 302 |  |  | $ | 706 |
Net unrealized gains (losses) on cash flow hedges | (7 | ) |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | (6 | )
Foreign currency translation adjustments | (15 | ) |  | 8 |  |  | 3 |  |  | 11 |  |  | — |  |  | 11 |  |  | (4 | )
Pension and other postretirement plans adjustments | (7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (7 | )
Total | $ | 375 |  |  | $ | 474 |  |  | $ | (160 | ) |  | $ | 314 |  |  | $ | — |  |  | $ | 314 |  |  | $ | 689 |
Nine months ended September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on securities arising during the period |  |  | $ | 656 |  |  | $ | (229 | ) |  | $ | 427 |  |  | $ | (6 | ) |  | $ | 421 |  |  |
Reclassification adjustment for realized (gains) losses included in net earnings (a) |  |  | 32 |  |  | (12 | ) |  | 20 |  |  | (1 | ) |  | 19 |  |  |
Total net unrealized gains on securities | $ | 332 |  |  | 688 |  |  | (241 | ) |  | 447 |  |  | (7 | ) |  | 440 |  |  | $ | 772 |
Net unrealized gains on cash flow hedges | 1 |  |  | 6 |  |  | (2 | ) |  | 4 |  |  | — |  |  | 4 |  |  | 5 |
Foreign currency translation adjustments | (22 | ) |  | 2 |  |  | 2 |  |  | 4 |  |  | — |  |  | 4 |  |  | (18 | )
Pension and other postretirement plans adjustments | (7 | ) |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | (6 | )
Total | $ | 304 |  |  | $ | 697 |  |  | $ | (241 | ) |  | $ | 456 |  |  | $ | (7 | ) |  | $ | 449 |  |  | $ | 753 |
(a) | The reclassification adjustment out of net unrealized gains 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 |
| Attributable to noncontrolling interests |  | Net earnings (loss) attributable to noncontrolling interests |
(b) | Includes net unrealized gains of $58 million at September 30, 2017 compared to $56 million at June 30, 2017 and $52 million at December 31, 2016 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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