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2404406 - Disclosure - Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details)
(http://www.afginc.com/role/FairValueMeasurementsChangesInBalancesOfLevel3FinancialAssetsCarriedAtFairValueDetails)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001042046 (http://www.sec.gov/CIK)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Asset Class [Axis]Asset Class [Axis]Asset Class [Axis]
U.S. government agencyState and municipalResidential MBSCommercial MBSAsset-backed securitiesCorporate and otherFixed maturitiesEquity securitiesAssets of MIEFair Value by Asset Class [Domain]U.S. government agencyState and municipalResidential MBSCommercial MBSAsset-backed securitiesCorporate and otherFixed maturitiesEquity securitiesAssets of MIEFair Value by Asset Class [Domain]U.S. government agencyState and municipalResidential MBSCommercial MBSAsset-backed securitiesCorporate and otherFixed maturitiesEquity securitiesAssets of MIEFair Value by Asset Class [Domain]
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Financial assets, Beginning Balance
15,000,000  
89,000,000  
224,000,000  
39,000,000  
470,000,000  
633,000,000  
1,470,000,000  
140,000,000  
26,000,000  
1,636,000,000  
15,000,000  
100,000,000  
300,000,000  
44,000,000  
226,000,000  
546,000,000  
1,231,000,000  
93,000,000  
31,000,000  
1,355,000,000  
15,000,000  
61,000,000  
316,000,000  
28,000,000  
75,000,000  
335,000,000  
830,000,000  
31,000,000  
30,000,000  
891,000,000  
Impact of accounting change
          
0  
0  
0  
0  
0  
0  
0  
0  
0  
0  
          
Total realized/unrealized gains (losses) included in Net income
(8,000,000) 
0  
(4,000,000) 
(1,000,000) 
(1,000,000) 
0  
(14,000,000) 
(12,000,000) 
(9,000,000) 
(35,000,000) 
0  
0  
(11,000,000) 
(1,000,000) 
1,000,000  
(5,000,000) 
(16,000,000) 
(4,000,000) 
(11,000,000) 
(31,000,000) 
0  
(1,000,000) 
4,000,000  
(1,000,000) 
3,000,000  
2,000,000  
7,000,000  
1,000,000  
(3,000,000) 
5,000,000  
Total realized/unrealized gains (losses) included in other comprehensive income (loss)
1,000,000  
(4,000,000) 
(2,000,000) 
0  
1,000,000  
(10,000,000) 
(14,000,000) 
35,000,000  
0  
21,000,000  
0  
(1,000,000) 
(1,000,000) 
(1,000,000) 
(7,000,000) 
(9,000,000) 
(19,000,000) 
(9,000,000) 
0  
(28,000,000) 
0  
0  
3,000,000  
0  
(2,000,000) 
13,000,000  
14,000,000  
2,000,000  
0  
16,000,000  
Purchases and issuances
0  
57,000,000  
8,000,000  
0  
50,000,000  
176,000,000  
291,000,000  
44,000,000  
12,000,000  
347,000,000  
0  
34,000,000  
0  
0  
265,000,000  
161,000,000  
460,000,000  
77,000,000  
6,000,000  
543,000,000  
0  
30,000,000  
13,000,000  
0  
99,000,000  
102,000,000  
244,000,000  
62,000,000  
6,000,000  
312,000,000  
Sales and settlements
0  
(2,000,000) 
(28,000,000) 
(7,000,000) 
(52,000,000) 
(100,000,000) 
(189,000,000) 
(28,000,000) 
0  
(217,000,000) 
0  
(1,000,000) 
(34,000,000) 
(2,000,000) 
(56,000,000) 
(90,000,000) 
(183,000,000) 
0  
0  
(183,000,000) 
0  
0  
(31,000,000) 
0  
(39,000,000) 
(73,000,000) 
(143,000,000) 
(9,000,000) 
(2,000,000) 
(154,000,000) 
Transfer into Level 3
0  
0  
34,000,000  
0  
60,000,000  
30,000,000  
124,000,000  
15,000,000  
0  
139,000,000  
0  
2,000,000  
86,000,000  
4,000,000  
53,000,000  
41,000,000  
186,000,000  
0  
0  
186,000,000  
0  
10,000,000  
111,000,000  
17,000,000  
117,000,000  
172,000,000  
427,000,000  
22,000,000  
0  
449,000,000  
Transfer out of Level 3
0  
0  
(42,000,000) 
(6,000,000) 
(44,000,000) 
(17,000,000) 
(109,000,000) 
(20,000,000) 
0  
(129,000,000) 
0  
(39,000,000) 
(88,000,000) 
(1,000,000) 
(10,000,000) 
(5,000,000) 
(143,000,000) 
(17,000,000) 
0  
(160,000,000) 
0  
0  
(116,000,000) 
0  
(27,000,000) 
(5,000,000) 
(148,000,000) 
(16,000,000) 
0  
(164,000,000) 
Sale of subsidiaries
          
0  
(6,000,000) 
(28,000,000) 
(4,000,000) 
(2,000,000) 
(6,000,000) 
(46,000,000) 
0  
0  
(46,000,000) 
          
Financial assets, Ending Balance
8,000,000  
 
140,000,000  
 
190,000,000  
 
25,000,000  
 
484,000,000  
 
712,000,000  
 
1,559,000,000  
 
174,000,000  
 
29,000,000  
 
1,762,000,000  
 
15,000,000  
 
89,000,000  
 
224,000,000  
 
39,000,000  
 
470,000,000  
 
633,000,000  
 
1,470,000,000  
 
140,000,000  
 
26,000,000  
 
1,636,000,000  
 
15,000,000  
 
100,000,000  
 
300,000,000  
 
44,000,000  
 
226,000,000  
 
546,000,000  
 
1,231,000,000  
 
93,000,000  
 
31,000,000  
 
1,355,000,000