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Fair Value Of Financial Instruments (Fair Value Hierarchy Table Presents The Company's Assets And Liabilities At Fair Value Not Recorded On The Company's Consolidated Balance Sheet) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Assets held for sale   $ 555
Variable Interest Entity Primary Beneficiary [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Investments held-to-maturity, fair value $ 916 876
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 2 3
Accrued investment income [1]   0
Assets held for sale   306
Total assets 892 1,199
Investment agreements 337 399
Medium-term notes 650 794
Long-term debt 2,121 1,986
Payable for investments purchased [2]   0
Total liabilities 4,328 4,069
Gross 1,220 995
Ceded 39 43
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Investments held-to-maturity, fair value 890 890
Variable interest entity notes 1,220 890
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments [1] 2 2
Accrued investment income [1]   0
Assets held for sale   306
Total assets 918 1,184
Investment agreements 433 508
Medium-term notes 406 478
Long-term debt 1,002 1,030
Payable for investments purchased [2]   0
Total liabilities 3,109 2,898
Gross 1,785 2,638
Ceded 61 18
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Investments held-to-maturity, fair value 916 876
Variable interest entity notes 1,268 882
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments [1] 2 2
Accrued investment income [1]   0
Assets held for sale   306
Total assets 2 308
Long-term debt 1,002 1,030
Payable for investments purchased [2]   0
Total liabilities 1,354 1,030
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity notes 352  
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Total assets 916 876
Investment agreements 433 508
Medium-term notes 406 478
Total liabilities 1,755 1,868
Gross 1,785 2,638
Ceded 61 18
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Investments held-to-maturity, fair value 916 876
Variable interest entity notes $ 916 $ 882
[1]
Reported within "Other assets" on MBIA's consolidated balance sheets.
[2]
Reported within "Other liabilities" on MBIA's consolidated balance sheets.