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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
Sep. 30, 2015
Dec. 31, 2014
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Assets held for sale $ 0 $ 802
Investments held-to-maturity, fair value 2,442 2,632
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 1 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Total assets 0 0
Total liabilities 0 0
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]    
Accrued investment income [1] 42 43
Receivable for investments sold [1] 38 69
Total assets 80 138
Long-term debt 1,008 1,172
Payable for investments purchased [2] 19 42
Total liabilities 1,027 1,214
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] | Facilities [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Assets held for sale   26
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]    
Other investments 3 4
Total assets 2,445 2,636
Investment agreements 638 705
Medium-term notes 574 801
Total liabilities 3,873 4,285
Gross 3,799 4,051
Ceded 107 109
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 2,442 2,632
Variable interest entity notes 2,661 2,779
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 3 4
Accrued investment income [1] 42 43
Receivable for investments sold [1] 38 69
Total assets 2,790 2,899
Investment agreements 485 547
Medium-term notes 863 1,004
Long-term debt 1,882 1,810
Payable for investments purchased [2] 19 42
Total liabilities 5,955 6,160
Gross 1,742 1,959
Ceded 58 65
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Facilities [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Assets held for sale   26
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 2,707 2,757
Variable interest entity notes 2,706 2,757
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 3 4
Accrued investment income [1] 42 43
Receivable for investments sold [1] 38 69
Total assets 2,525 2,774
Investment agreements 638 705
Medium-term notes 574 801
Long-term debt 1,008 1,172
Payable for investments purchased [2] 19 42
Total liabilities 4,900 5,499
Gross 3,799 4,051
Ceded 107 109
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Facilities [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Assets held for sale   26
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 2,442 2,632
Variable interest entity notes $ 2,661 $ 2,779
[1] Reported within "Other assets" on MBIA's consolidated balance sheets.
[2] Reported within "Other liabilities" on MBIA's consolidated balance sheets.