XML 122 R111.htm IDEA: XBRL DOCUMENT v3.8.0.1
Long-Term Debt and Credit Facilities - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 07, 2008
Jun. 30, 2003
USD ($)
Trust
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2012
USD ($)
Oct. 25, 2013
USD ($)
Apr. 08, 2005
USD ($)
Trust
Debt Instrument [Line Items]                
Debt repurchase amount     $ 1,538,000,000   $ 1,558,000,000      
Consolidation, Eliminations [Member]                
Debt Instrument [Line Items]                
Debt repurchase amount     (48,000,000)   (28,000,000)      
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     6,000,000   6,000,000      
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     6,000,000   6,000,000      
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     20,000,000   28,000,000      
Loss on extinguishment of debt     (7,000,000) $ 0        
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     $ 60,000,000          
Intercompany debt           $ 90,000,000    
Repayments of Debt         $ 10,000,000