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Long-Term Debt and Credit Facilities - Narrative (Details)
1 Months Ended 12 Months Ended
Apr. 07, 2008
Jun. 30, 2003
USD ($)
Trust
Dec. 31, 2016
USD ($)
Dec. 31, 2012
USD ($)
Jun. 30, 2017
USD ($)
Oct. 25, 2013
USD ($)
Apr. 08, 2005
USD ($)
Trust
Debt Instrument [Line Items]              
Debt repurchase amount     $ 1,589,000,000   $ 1,566,000,000    
Consolidation, Eliminations [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     0   (22,000,000)    
AGC Trust Preferred Securities [Member]              
Debt Instrument [Line Items]              
Basis points 2.50%            
AGM Trust Preferred Securities [Member]              
Debt Instrument [Line Items]              
Basis points   2.00%          
AGUS [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     850,000,000   850,000,000    
AGM [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     9,000,000   8,000,000    
AGM [Member] | AGM CPS securities [Member]              
Debt Instrument [Line Items]              
Number of custodial trusts | Trust   4          
Aggregate maximum stock purchase obligation of the custodial trusts   $ 200,000,000          
Maximum stock purchase obligation of each custodial trust   $ 50,000,000          
Rate basis for income distributions   one-month LIBOR          
AGC [Member] | AGM CPS securities [Member]              
Debt Instrument [Line Items]              
Number of custodial trusts | Trust             4
Aggregate maximum stock purchase obligation of the custodial trusts             $ 50,000,000
Maximum stock purchase obligation of each custodial trust             $ 200,000,000
Rate basis for income distributions one-month LIBOR            
AGMH [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     730,000,000   730,000,000    
Junior Subordinated Debt [Member] | AGMH [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     300,000,000   300,000,000    
Line of Credit [Member] | Revolving Credit Facility [Member] | Wilbur L. Ross [Member]              
Debt Instrument [Line Items]              
Interest rate, as a percentage of Federal short-term or mid-term interest rate           100.00%  
Notes Payable, Other Payables [Member] | AGM [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     9,000,000   8,000,000    
Notes Payable 5.60% [Member] | Notes Payable, Other Payables [Member] | AGMH [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     100,000,000   100,000,000    
6.25% Notes [Member] | Notes Payable, Other Payables [Member] | AGMH [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     230,000,000   230,000,000    
QUIBS 6.875% [Member] | Corporate securities [Member] | AGMH [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     100,000,000   100,000,000    
Senior Notes 7.0% [Member] | Senior Notes [Member] | AGUS [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     200,000,000   200,000,000    
Senior Notes 5.0% [Member] | Senior Notes [Member] | AGUS [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount     500,000,000   500,000,000    
AGMH [Member] | Junior Subordinated Debt [Member] | AGUS [Member] | Consolidation, Eliminations [Member]              
Debt Instrument [Line Items]              
Debt repurchase amount         22,000,000    
Intercompany Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Wilbur L. Ross [Member] | AGL [Member]              
Debt Instrument [Line Items]              
Related party, maximum borrowing capacity           $ 225,000,000  
Line of credit, outstanding amount         0    
Municipal Assurance Corp [Member] | AGUS [Member]              
Debt Instrument [Line Items]              
Notes Payable, Related Parties         $ 70,000,000    
Intercompany debt       $ 90,000,000      
Repayments of Debt     $ 20,000,000