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Shareholders' Equity - Progression of the components of accumulated other comprehensive income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
AOCI beginning balance |  | $ 863 |
Other comprehensive income (loss), net of tax |  | (829) | $ 396
AOCI ending balance |  | 32 |
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 |  | (1,095) | 487
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, tax |  | 230 | (103)
Other comprehensive income (loss), unrealized holding gains on securities arising during the period, net of tax |  | (865) | 384
Reclassification from accumulated other comprehensive income, pretax | [1] | 24 | (4)
Reclassification from accumulated other comprehensive income, tax | [1] | (5) | 1
Reclassification from accumulated other comprehensive income, net of tax |  | 19 | (3)
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), pretax |  | (1,071) | 483
Other comprehensive income (loss), tax |  | 225 | (102)
Other comprehensive income (loss), net of tax |  | (846) | 381
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
Reclassification from accumulated other comprehensive income, net of tax | [1] | 0 | 0
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), net of tax |  | 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 |  | (865) | 384
Reclassification from accumulated other comprehensive income, net of tax |  | 19 | (3)
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
AOCI beginning balance |  | 862 | 83
Other comprehensive income (loss), net of tax |  | (846) | 381
AOCI ending balance |  | 16 | 464
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 |  | 34 | 14
Other comprehensive income (loss), tax |  | (7) | (3)
Other comprehensive income (loss), net of tax |  | 27 | 11
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
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
AOCI beginning balance |  | 17 | (11)
Other comprehensive income (loss), net of tax |  | 27 | 11
AOCI ending balance |  | 44 | 0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), pretax |  | (10) | 4
Other comprehensive income (loss), tax |  | 0 | 0
Other comprehensive income (loss), net of tax |  | (10) | 4
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), net of tax |  | (2) | 0
Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
AOCI beginning balance |  | (9) | (16)
Other comprehensive income (loss), net of tax |  | (12) | 4
AOCI ending balance |  | (21) | (12)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), pretax |  | 0 | 0
Other comprehensive income (loss), tax |  | 0 | 0
Other comprehensive income (loss), net of tax |  | 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
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
AOCI beginning balance |  | (7) | (8)
Other comprehensive income (loss), net of tax |  | 0 | 0
AOCI ending balance |  | (7) | (8)
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), pretax |  | (1,047) | 501
Other comprehensive income (loss), tax |  | 218 | (105)
Other comprehensive income (loss), net of tax |  | (829) | 396
AOCI Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Other comprehensive income (loss), net of tax |  | (2) | 0
AOCI Attributable to Parent |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
AOCI beginning balance |  | 863 | 48
Other comprehensive income (loss), net of tax |  | (831) | 396
AOCI ending balance |  | $ 32 | $ 444
[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 (credit) for income taxes |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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