XML 60 R47.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investments - Available for sale fixed maturities and equity securities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 36,412 | $ 33,735
Available for sale (AFS) fixed maturities | 37,818 | 34,544
Equity securities, Available for sale, Amortized Cost | 1,312 | 1,351
Equity securities, Available for sale, Fair Value | 1,579 | 1,502
Total fixed maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 36,412 | 33,735
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,491 | 1,054
Fixed maturities, Available for sale, Gross Unrealized, Losses | (85) | (245)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,406 | 809
Available for sale (AFS) fixed maturities | 37,818 | 34,544
U.S. Government and government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 257 | 315
Fixed maturities, Available for sale, Gross Unrealized, Gains | 2 | 3
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) | (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 0 | 0
Available for sale (AFS) fixed maturities | 257 | 315
States, municipalities and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,761 | 6,650
Fixed maturities, Available for sale, Gross Unrealized, Gains | 259 | 200
Fixed maturities, Available for sale, Gross Unrealized, Losses | (23) | (69)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 236 | 131
Available for sale (AFS) fixed maturities | 6,997 | 6,781
Foreign government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 141 | 131
Fixed maturities, Available for sale, Gross Unrealized, Gains | 3 | 5
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 3 | 5
Available for sale (AFS) fixed maturities | 144 | 136
Residential MBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 3,062 | 3,367
Fixed maturities, Available for sale, Gross Unrealized, Gains | 341 | 281
Fixed maturities, Available for sale, Gross Unrealized, Losses | (7) | (13)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 334 | 268
Available for sale (AFS) fixed maturities | 3,396 | 3,635
Commercial MBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 967 | 1,446
Fixed maturities, Available for sale, Gross Unrealized, Gains | 44 | 49
Fixed maturities, Available for sale, Gross Unrealized, Losses | (1) | (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 43 | 47
Available for sale (AFS) fixed maturities | 1,010 | 1,493
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 7,268 | 5,962
Fixed maturities, Available for sale, Gross Unrealized, Gains | 143 | 43
Fixed maturities, Available for sale, Gross Unrealized, Losses | (15) | (46)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 128 | (3)
Available for sale (AFS) fixed maturities | 7,396 | 5,959
Corporate and other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 17,956 | 15,864
Fixed maturities, Available for sale, Gross Unrealized, Gains | 699 | 473
Fixed maturities, Available for sale, Gross Unrealized, Losses | (37) | (112)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 662 | 361
Available for sale (AFS) fixed maturities | 18,618 | 16,225
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 1,312 | 1,351
Equity securities, Available for sale, Gross Unrealized, Gains | 295 | 181
Equity securities, Available for sale, Gross Unrealized, Losses | (28) | (30)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 267 | 151
Equity securities, Available for sale, Fair Value | 1,579 | 1,502
Common stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 830 | 879
Equity securities, Available for sale, Gross Unrealized, Gains | 251 | 160
Equity securities, Available for sale, Gross Unrealized, Losses | (27) | (23)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 224 | 137
Equity securities, Available for sale, Fair Value | 1,054 | 1,016
Perpetual preferred stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Available for sale, Amortized Cost | 482 | 472
Equity securities, Available for sale, Gross Unrealized, Gains | 44 | 21
Equity securities, Available for sale, Gross Unrealized, Losses | (1) | (7)
Equity securities, Available for sale, Net Unrealized, Gains (Losses) | 43 | 14
Equity securities, Available for sale, Fair Value | $ 525 | $ 486

X
- Definition Amount before tax of net unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References No definition available. + Details
Name: | afg_AvailableforsaleDebtSecuritiesAccumulatedNetUnrealizedGainLossbeforeTax
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of net unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References No definition available. + Details
Name: | afg_AvailableforsaleEquitySecuritiesAccumulatedNetUnrealizedGainLossbeforeTax
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesEquitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |