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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
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 (Loss) |  |  |  |
| AOCI Beginning Balance |  | Pretax |  | Tax |  | Net of tax |  | Attributable to noncontrolling interests |  | Attributable to shareholders |  | Other (c) |  | AOCI Ending Balance
Three months ended March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding losses on securities arising during the period |  |  | $ | (353 | ) |  | $ | 74 |  |  | $ | (279 | ) |  | $ | — |  |  | $ | (279 | ) |  |  |  |  |
Reclassification adjustment for realized (gains) losses included in net earnings (a) |  |  | 2 |  |  | — |  |  | 2 |  |  | — |  |  | 2 |  |  |  |  |  |
Total net unrealized gains (losses) on securities (b) | $ | 840 |  |  | (351 | ) |  | 74 |  |  | (277 | ) |  | — |  |  | (277 | ) |  | $ | (221 | ) |  | $ | 342 |
Net unrealized losses on cash flow hedges | (13 | ) |  | (14 | ) |  | 3 |  |  | (11 | ) |  | — |  |  | (11 | ) |  | — |  |  | (24 | )
Foreign currency translation adjustments | (6 | ) |  | 2 |  |  | (1 | ) |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | (5 | )
Pension and other postretirement plans adjustments | (8 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (8 | )
Total | $ | 813 |  |  | $ | (363 | ) |  | $ | 76 |  |  | $ | (287 | ) |  | $ | — |  |  | $ | (287 | ) |  | $ | (221 | ) |  | $ | 305 |
Three months ended March 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on securities arising during the period |  |  | $ | 191 |  |  | $ | (66 | ) |  | $ | 125 |  |  | $ | — |  |  | $ | 125 |  |  |  |  |
Reclassification adjustment for realized (gains) losses included in net earnings (a) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |
Total net unrealized gains on securities | $ | 404 |  |  | 191 |  |  | (66 | ) |  | 125 |  |  | — |  |  | 125 |  |  | $ | — |  |  | $ | 529 |
Net unrealized losses on cash flow hedges | (7 | ) |  | (2 | ) |  | 1 |  |  | (1 | ) |  | — |  |  | (1 | ) |  | — |  |  | (8 | )
Foreign currency translation adjustments | (15 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (15 | )
Pension and other postretirement plans adjustments | (7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (7 | )
Total | $ | 375 |  |  | $ | 189 |  |  | $ | (65 | ) |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |  |  | $ | — |  |  | $ | 499 |
(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 |
(b) | Includes net unrealized gains of $68 million at both March 31, 2018 and December 31, 2017 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.
(c) | 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 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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