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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.

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