XML 53 R40.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | $ 2,937 | $ 2,290 | $ 1,991 | $ 2,290 | $ 1,762
Total realized/unrealized gains (losses) included in Net income | (6) |  | (15) | (5) | (33)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (8) |  | (2) | (31) | 27
Purchases and issuances | 405 |  | 189 | 1,268 | 621
Sales and settlements | (89) |  | (102) | (241) | (238)
Transfer into Level 3 | 13 |  | 188 | 100 | 277
Transfer out of Level 3 | (34) |  | (139) | (163) | (306)
Financial assets, Ending Balance | 3,218 |  | 2,110 | 3,218 | 2,110
Fixed maturities |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 2,684 | 2,102 | 1,800 | 2,102 | 1,559
Total realized/unrealized gains (losses) included in Net income | 0 |  | (8) | (8) | (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (8) |  | 2 | (31) | 18
Purchases and issuances | 324 |  | 185 | 1,157 | 593
Sales and settlements | (89) |  | (102) | (237) | (235)
Transfer into Level 3 | 13 |  | 188 | 70 | 277
Transfer out of Level 3 | (17) |  | (139) | (146) | (282)
Financial assets, Ending Balance | 2,907 |  | 1,926 | 2,907 | 1,926
U.S. government agency |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 8 | 8 | 8 | 8 | 8
Total realized/unrealized gains (losses) included in Net income | 0 |  | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 | 0 | 0
Purchases and issuances | 0 |  | 0 | 0 | 0
Sales and settlements | 0 |  | 0 | 0 | 0
Transfer into Level 3 | 0 |  | 0 | 0 | 0
Transfer out of Level 3 | 0 |  | 0 | 0 | 0
Financial assets, Ending Balance | 8 |  | 8 | 8 | 8
State and municipal |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 61 | 148 | 143 | 148 | 140
Total realized/unrealized gains (losses) included in Net income | 0 |  | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 | (2) | 4
Purchases and issuances | 0 |  | 0 | 0 | 0
Sales and settlements | (1) |  | (1) | (2) | (2)
Transfer into Level 3 | 0 |  | 10 | 0 | 10
Transfer out of Level 3 | 0 |  | 0 | (84) | 0
Financial assets, Ending Balance | 60 |  | 152 | 60 | 152
Residential MBS |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 147 | 122 | 153 | 122 | 190
Total realized/unrealized gains (losses) included in Net income | (2) |  | 2 | (9) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (2) |  | 1 | (2) | 3
Purchases and issuances | 0 |  | 0 | 0 | 1
Sales and settlements | (6) |  | (6) | (17) | (37)
Transfer into Level 3 | 13 |  | 15 | 70 | 35
Transfer out of Level 3 | (5) |  | (21) | (19) | (48)
Financial assets, Ending Balance | 145 |  | 144 | 145 | 144
Commercial MBS |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 56 | 36 | 45 | 36 | 25
Total realized/unrealized gains (losses) included in Net income | 2 |  | 1 | 1 | 2
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 | 0 | 0
Purchases and issuances | (1) |  | 0 | 20 | 15
Sales and settlements | 0 |  | (10) | 0 | (10)
Transfer into Level 3 | 0 |  | 0 | 0 | 4
Transfer out of Level 3 | 0 |  | 0 | 0 | 0
Financial assets, Ending Balance | 57 |  | 36 | 57 | 36
Asset-backed securities |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 1,004 | 744 | 498 | 744 | 484
Total realized/unrealized gains (losses) included in Net income | 0 |  | (2) | (2) | (2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (3) |  | 1 | (6) | 3
Purchases and issuances | 13 |  | 13 | 353 | 117
Sales and settlements | (23) |  | (26) | (80) | (62)
Transfer into Level 3 | 0 |  | 163 | 0 | 199
Transfer out of Level 3 | 0 |  | (111) | (18) | (203)
Financial assets, Ending Balance | 991 |  | 536 | 991 | 536
Corporate and other |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 1,408 | 1,044 | 953 | 1,044 | 712
Total realized/unrealized gains (losses) included in Net income | 0 |  | (9) | 2 | (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | (3) |  | 0 | (21) | 8
Purchases and issuances | 312 |  | 172 | 784 | 460
Sales and settlements | (59) |  | (59) | (138) | (124)
Transfer into Level 3 | 0 |  | 0 | 0 | 29
Transfer out of Level 3 | (12) |  | (7) | (25) | (31)
Financial assets, Ending Balance | 1,646 |  | 1,050 | 1,646 | 1,050
Equity securities |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 230 | 165 | 168 | 165 | 174
Total realized/unrealized gains (losses) included in Net income | (5) |  | (3) | 9 | (19)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | (4) | 0 | 9
Purchases and issuances | 81 |  | 2 | 106 | 22
Sales and settlements | 0 |  | 0 | (4) | (3)
Transfer into Level 3 | 0 | 29 | 0 | 30 | 0
Transfer out of Level 3 | (17) |  | 0 | (17) | (20)
Financial assets, Ending Balance | 289 |  | 163 | 289 | 163
Assets of MIE |  |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Financial assets, Beginning Balance | 23 | $ 23 | 23 | 23 | 29
Total realized/unrealized gains (losses) included in Net income | (1) |  | (4) | (6) | (10)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 |  | 0 | 0 | 0
Purchases and issuances | 0 |  | 2 | 5 | 6
Sales and settlements | 0 |  | 0 | 0 | 0
Transfer into Level 3 | 0 |  | 0 | 0 | 0
Transfer out of Level 3 | 0 |  | 0 | 0 | (4)
Financial assets, Ending Balance | $ 22 |  | $ 21 | $ 22 | $ 21

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=afg_AssetsOfManagedInvestmentEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |