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Investments (Tables) | 3 Months Ended
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Mar. 31, 2016
Text Block [Abstract] |
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Portfolios |
|  |  |  |  |  | March 31, 2016
|  |  |  |  |  |  |  |  | Gross |  | Gross |  |  |  |  | Other-Than-
|  |  |  |  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Temporary
In millions |  | Cost |  | Gains |  | Losses |  | Value |  | Impairments(1)
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury and government agency |  | $ | 1,171 |  | $ | 55 |  | $ | - |  | $ | 1,226 |  | $ | -
| State and municipal bonds |  |  | 1,559 |  |  | 90 |  |  | (3) |  |  | 1,646 |  |  | -
| Foreign governments |  |  | 187 |  |  | 3 |  |  | (1) |  |  | 189 |  |  | -
| Corporate obligations |  |  | 1,638 |  |  | 42 |  |  | (96) |  |  | 1,584 |  |  | (88)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 958 |  |  | 13 |  |  | (3) |  |  | 968 |  |  | -
|  | Residential mortgage-backed non-agency |  |  | 55 |  |  | 1 |  |  | (7) |  |  | 49 |  |  | (4)
|  | Commercial mortgage-backed |  |  | 30 |  |  | - |  |  | (1) |  |  | 29 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 46 |  |  | - |  |  | (17) |  |  | 29 |  |  | -
|  | Other asset-backed |  |  | 369 |  |  | 1 |  |  | (13) |  |  | 357 |  |  | -
|  |  | Total fixed-maturity investments |  |  | 6,013 |  |  | 205 |  |  | (141) |  |  | 6,077 |  |  | (92)
Money market securities |  |  | 206 |  |  | - |  |  | - |  |  | 206 |  |  | -
Perpetual debt and equity securities |  |  | 5 |  |  | 2 |  |  | - |  |  | 7 |  |  | -
Total AFS investments |  | $ | 6,224 |  | $ | 207 |  | $ | (141) |  | $ | 6,290 |  | $ | (92)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 890 |  | $ | - |  | $ | (365) |  | $ | 525 |  | $ | -
Total HTM investments |  | $ | 890 |  | $ | - |  | $ | (365) |  | $ | 525 |  | $ | -
_______________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) - Represents unrealized gains or losses on OTTI securities recognized in AOCI, which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in AOCI.
|  |  |  |  |  | December 31, 2015
|  |  |  |  |  |  |  |  | Gross |  | Gross |  |  |  |  | Other-Than-
|  |  |  |  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Temporary
In millions |  | Cost |  | Gains |  | Losses |  | Value |  | Impairments(1)
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury and government agency |  | $ | 947 |  | $ | 32 |  | $ | (3) |  | $ | 976 |  | $ | -
| State and municipal bonds |  |  | 1,674 |  |  | 65 |  |  | (14) |  |  | 1,725 |  |  | -
| Foreign governments |  |  | 197 |  |  | 3 |  |  | (2) |  |  | 198 |  |  | -
| Corporate obligations |  |  | 1,516 |  |  | 21 |  |  | (103) |  |  | 1,434 |  |  | (85)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 995 |  |  | 7 |  |  | (9) |  |  | 993 |  |  | -
|  | Residential mortgage-backed non-agency |  |  | 55 |  |  | 2 |  |  | (6) |  |  | 51 |  |  | (4)
|  | Commercial mortgage-backed |  |  | 31 |  |  | - |  |  | - |  |  | 31 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 51 |  |  | - |  |  | (18) |  |  | 33 |  |  | -
|  | Other asset-backed |  |  | 331 |  |  | 1 |  |  | (17) |  |  | 315 |  |  | -
|  |  | Total fixed-maturity investments |  |  | 5,797 |  |  | 131 |  |  | (172) |  |  | 5,756 |  |  | (89)
Money market securities |  |  | 351 |  |  | - |  |  | - |  |  | 351 |  |  | -
Perpetual debt and equity securities |  |  | 12 |  |  | 1 |  |  | - |  |  | 13 |  |  | -
Total AFS investments |  | $ | 6,160 |  | $ | 132 |  | $ | (172) |  | $ | 6,120 |  | $ | (89)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 2,689 |  | $ | 24 |  | $ | (312) |  | $ | 2,401 |  | $ | -
Total HTM investments |  | $ | 2,689 |  | $ | 24 |  | $ | (312) |  | $ | 2,401 |  | $ | -
_______________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(1) - Represents unrealized gains or losses on OTTI securities recognized in AOCI, which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in AOCI.
Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments |
|  | AFS Securities |  | HTM Securities
|  |  |  |  |  |  |  | Consolidated VIEs
|  | Amortized |  |  |  |  | Amortized |  |  |
In millions |  | Cost |  | Fair Value |  | Cost |  | Fair Value
Due in one year or less |  | $ | 609 |  | $ | 609 |  | $ | - |  | $ | -
Due after one year through five years |  |  | 1,582 |  |  | 1,609 |  |  | - |  |  | -
Due after five years through ten years |  |  | 883 |  |  | 929 |  |  | - |  |  | -
Due after ten years |  |  | 1,481 |  |  | 1,498 |  |  | 890 |  |  | 525
Mortgage-backed and asset-backed |  |  | 1,458 |  |  | 1,432 |  |  | - |  |  | -
Total fixed-maturity investments |  | $ | 6,013 |  | $ | 6,077 |  | $ | 890 |  | $ | 525
Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments |
|  |  |  |  |  | March 31, 2016
|  |  |  |  |  | Less than 12 Months |  | 12 Months or Longer |  | Total
|  |  |  |  |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
In millions |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury and government agency |  | $ | 53 |  | $ | - |  | $ | - |  | $ | - |  | $ | 53 |  | $ | -
| State and municipal bonds |  |  | 115 |  |  | (1) |  |  | 20 |  |  | (2) |  |  | 135 |  |  | (3)
| Foreign governments |  |  | 10 |  |  | - |  |  | 2 |  |  | (1) |  |  | 12 |  |  | (1)
| Corporate obligations |  |  | 303 |  |  | (4) |  |  | 83 |  |  | (92) |  |  | 386 |  |  | (96)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 58 |  |  | - |  |  | 259 |  |  | (3) |  |  | 317 |  |  | (3)
|  | Residential mortgage-backed non-agency |  |  | 18 |  |  | (2) |  |  | 21 |  |  | (5) |  |  | 39 |  |  | (7)
|  | Commercial mortgage-backed |  |  | 22 |  |  | (1) |  |  | 1 |  |  | - |  |  | 23 |  |  | (1)
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 2 |  |  | - |  |  | 25 |  |  | (17) |  |  | 27 |  |  | (17)
|  | Other asset-backed |  |  | 169 |  |  | (2) |  |  | 44 |  |  | (11) |  |  | 213 |  |  | (13)
|  |  | Total fixed-maturity investments |  |  | 750 |  |  | (10) |  |  | 455 |  |  | (131) |  |  | 1,205 |  |  | (141)
Perpetual debt and equity securities |  |  | - |  |  | - |  |  | 1 |  |  | - |  |  | 1 |  |  | -
Total AFS investments |  | $ | 750 |  | $ | (10) |  | $ | 456 |  | $ | (131) |  | $ | 1,206 |  | $ | (141)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 289 |  | $ | (26) |  | $ | 236 |  | $ | (339) |  | $ | 525 |  | $ | (365)
Total HTM investments |  | $ | 289 |  | $ | (26) |  | $ | 236 |  | $ | (339) |  | $ | 525 |  | $ | (365)
|  |  |  |  |  | December 31, 2015
|  |  |  |  |  | Less than 12 Months |  | 12 Months or Longer |  | Total
|  |  |  |  |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
In millions |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury and government agency |  | $ | 434 |  | $ | (2) |  | $ | 50 |  | $ | (1) |  | $ | 484 |  | $ | (3)
| State and municipal bonds |  |  | 536 |  |  | (11) |  |  | 42 |  |  | (3) |  |  | 578 |  |  | (14)
| Foreign governments |  |  | 32 |  |  | (2) |  |  | - |  |  | - |  |  | 32 |  |  | (2)
| Corporate obligations |  |  | 693 |  |  | (14) |  |  | 78 |  |  | (89) |  |  | 771 |  |  | (103)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 399 |  |  | (4) |  |  | 159 |  |  | (5) |  |  | 558 |  |  | (9)
|  | Residential mortgage-backed non-agency |  |  | 24 |  |  | (2) |  |  | 17 |  |  | (4) |  |  | 41 |  |  | (6)
|  | Commercial mortgage-backed |  |  | 25 |  |  | - |  |  | 1 |  |  | - |  |  | 26 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 2 |  |  | - |  |  | 29 |  |  | (18) |  |  | 31 |  |  | (18)
|  | Other asset-backed |  |  | 242 |  |  | (1) |  |  | 34 |  |  | (16) |  |  | 276 |  |  | (17)
|  |  | Total fixed-maturity investments |  |  | 2,387 |  |  | (36) |  |  | 410 |  |  | (136) |  |  | 2,797 |  |  | (172)
Perpetual debt and equity securities |  |  | 2 |  |  | - |  |  | 3 |  |  | - |  |  | 5 |  |  | -
Total AFS investments |  | $ | 2,389 |  | $ | (36) |  | $ | 413 |  | $ | (136) |  | $ | 2,802 |  | $ | (172)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 1,093 |  | $ | (17) |  | $ | 280 |  | $ | (295) |  | $ | 1,373 |  | $ | (312)
Total HTM investments |  | $ | 1,093 |  | $ | (17) |  | $ | 280 |  | $ | (295) |  | $ | 1,373 |  | $ | (312)
Distribution Of Securities By Percentage Of Fair Value Below Book Value By More Than 5% |
|  |  | AFS Securities |  | HTM Securities
| Percentage of Fair Value |  | Number of |  | Book Value |  | Fair Value |  | Number of |  | Book Value |  | Fair Value
| Below Book Value |  | Securities |  | (in millions) |  | (in millions) |  | Securities |  | (in millions) |  | (in millions)
| > 5% to 15% |  | 13 |  | $ | 25 |  | $ | 23 |  | - |  | $ | - |  | $ | -
| > 15% to 25% |  | 3 |  |  | 3 |  |  | 2 |  | - |  |  | - |  |  | -
| > 25% to 50% |  | 9 |  |  | 63 |  |  | 45 |  | - |  |  | - |  |  | -
| > 50% |  | 3 |  |  | 123 |  |  | 18 |  | 1 |  |  | 575 |  |  | 236
| Total |  | 28 |  | $ | 214 |  | $ | 88 |  | 1 |  | $ | 575 |  | $ | 236
Fair Values And Gross Unrealized Losses By Credit Rating Category Of ABS, MBS and Corporate Obligations |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Below |  |  |  |  |  |  |  |  |  |  |  |
In millions |  | Aaa |  | Aa |  | A |  | Baa |  | Investment Grade |  | Not Rated |  | Total
|  |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
Asset Type |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
ABS |  | $ | 125 |  | $ | (1) |  | $ | 74 |  | $ | (1) |  | $ | 2 |  | $ | - |  | $ | 6 |  | $ | - |  | $ | 33 |  | $ | (28) |  | $ | - |  | $ | - |  | $ | 240 |  | $ | (30)
MBS |  |  | 331 |  |  | (4) |  |  | 3 |  |  | - |  |  | 2 |  |  | - |  |  | 5 |  |  | - |  |  | 25 |  |  | (3) |  |  | 13 |  |  | (4) |  |  | 379 |  |  | (11)
Corporate obligations |  |  | 147 |  |  | (1) |  |  | 109 |  |  | - |  |  | 58 |  |  | (1) |  |  | 44 |  |  | (3) |  |  | 13 |  |  | (3) |  |  | 15 |  |  | (88) |  |  | 386 |  |  | (96)
| Total |  | $ | 603 |  | $ | (6) |  | $ | 186 |  | $ | (1) |  | $ | 62 |  | $ | (1) |  | $ | 55 |  | $ | (3) |  | $ | 71 |  | $ | (34) |  | $ | 28 |  | $ | (92) |  | $ | 1,005 |  | $ | (137)
Average Credit Ratings and Fair Value and Percentage Of Guaranteed ABS MBS and Corporate Obligations Below Investment Grade |
|  |  |  |  |  | Insured Securities Rated Below
|  |  |  |  |  | Investment Grade without the
|  |  |  |  |  | Effect of Guarantee
|  | Average Credit Rating with the |  | Average Credit Rating without the |  | (in millions) |  |  |
Asset Type |  | Effect of Guarantee |  | Effect of Guarantee |  | Fair Value |  | Percentage
ABS |  | Below Investment Grade |  | Below Investment Grade |  | $ | 31 |  | 58 | %
MBS |  | Below Investment Grade |  | Below Investment Grade |  | $ | 18 |  | 100 | %
Securities Held In Unrealized Loss Position And Insured By Financial Guarantor and The Related Insurance Loss Reserve On Company Insured Investments |
|  |  |  |  |  |  | Unrealized |  | Insurance Loss |
| In millions |  | Fair Value |  | Loss |  | Reserve (2) |
| Asset-backed: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  | $ | 54 |  | $ | (28) |  | $ | 13 |
| Mortgage-backed: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  |  | 18 |  |  | (2) |  |  | 15 |
| Other: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  |  | 67 |  |  | (2) |  |  | - |
|  | Other |  |  | 2 |  |  | - |  |  | - |
|  |  | Total other |  |  | 69 |  |  | (2) |  |  | - |
| Total |  | $ | 141 |  | $ | (32) |  | $ | 28 |
| _______________ |  |  |  |  |  |  |  |  |  |
| (1) - Includes investments insured by MBIA Corp. and National. |
| (2) - Insurance loss reserve estimates are based on the proportion of par value owned to the total amount of par value insured. |
Gross Realized Gains and Losses From Sales Of Available-For-Sale Securities |
|  |  |  | Three Months Ended March 31, |
| In millions |  | 2016 |  | 2015 |
| Proceeds from sales |  | $ | 281 |  | $ | 192 |
| Gross realized gains |  |  | 10 |  |  | 5 |
| Gross realized losses |  |  | (4) |  |  | (7) |

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- Definition A table of investments, shown as a text block. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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