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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Available-For-Sale and Held-To-Maturity Securities In Consolidated Investment Portfolio |
|  | December 31, 2012 |
In millions |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Other-Than- Temporary Impairments(1) |
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agency |  | $ | 819 |  |  | $ | 40 |  |  | $ | (1) |  |  | $ | 858 |  |  | $ | — |
State and municipal bonds |  |  | 1,446 |  |  |  | 97 |  |  |  | (12) |  |  |  | 1,531 |  |  |  | — |
Foreign governments |  |  | 183 |  |  |  | 13 |  |  |  | — |  |  |  | 196 |  |  |  | — |
Corporate obligations |  |  | 1,058 |  |  |  | 54 |  |  |  | (20) |  |  |  | 1,092 |  |  |  | 5 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed agency |  |  | 939 |  |  |  | 19 |  |  |  | (1) |  |  |  | 957 |  |  |  | — |
Residential mortgage-backed non-agency |  |  | 86 |  |  |  | 11 |  |  |  | (8) |  |  |  | 89 |  |  |  | — |
Commercial mortgage-backed |  |  | 46 |  |  |  | — |  |  |  | (4) |  |  |  | 42 |  |  |  | — |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 161 |  |  |  | 1 |  |  |  | (71) |  |  |  | 91 |  |  |  | (25) |
Other asset-backed |  |  | 145 |  |  |  | 3 |  |  |  | (11) |  |  |  | 137 |  |  |  | — |
Total fixed-maturity investments |  |  | 4,883 |  |  |  | 238 |  |  |  | (128) |  |  |  | 4,993 |  |  |  | (20) |
Money market securities |  |  | 580 |  |  |  | — |  |  |  | — |  |  |  | 580 |  |  |  | — |
Equity securities |  |  | 22 |  |  |  | 1 |  |  |  | — |  |  |  | 23 |  |  |  | — |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal bonds |  |  | 38 |  |  |  | 3 |  |  |  | — |  |  |  | 41 |  |  |  | — |
Corporate obligations |  |  | 177 |  |  |  | 9 |  |  |  | (6) |  |  |  | 180 |  |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed non-agency |  |  | 92 |  |  |  | — |  |  |  | (10) |  |  |  | 82 |  |  |  | — |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 97 |  |  |  | — |  |  |  | (8) |  |  |  | 89 |  |  |  | — |
Other asset-backed |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 23 |  |  |  | — |
Money market securities |  |  | 210 |  |  |  | — |  |  |  | — |  |  |  | 210 |  |  |  | — |
Total AFS investments |  | $ | 6,122 |  |  | $ | 251 |  |  | $ | (152) |  |  | $ | 6,221 |  |  | $ | (20) |
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  | $ | 2,829 |  |  | $ | 2 |  |  | $ | (157) |  |  | $ | 2,674 |  |  | $ | — |
Total HTM investments |  | $ | 2,829 |  |  | $ | 2 |  |  | $ | (157) |  |  | $ | 2,674 |  |  | $ | — |
(1)—Represents unrealized gains or losses on other than temporarily impaired securities recognized in accumulated other comprehensive income (loss), which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in accumulated other comprehensive income (loss).
|  | December 31, 2011 |
In millions |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Other-Than- Temporary Impairments(1) |
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agency |  | $ | 1,091 |  |  | $ | 39 |  |  | $ | — |  |  | $ | 1,130 |  |  | $ | — |
State and municipal bonds |  |  | 2,025 |  |  |  | 76 |  |  |  | (19) |  |  |  | 2,082 |  |  |  | — |
Foreign governments |  |  | 350 |  |  |  | 24 |  |  |  | — |  |  |  | 374 |  |  |  | — |
Corporate obligations |  |  | 1,674 |  |  |  | 42 |  |  |  | (106) |  |  |  | 1,610 |  |  |  | (2) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed agency |  |  | 1,198 |  |  |  | 47 |  |  |  | — |  |  |  | 1,245 |  |  |  | — |
Residential mortgage-backed non-agency |  |  | 325 |  |  |  | 31 |  |  |  | (83) |  |  |  | 273 |  |  |  | (57) |
Commercial mortgage-backed |  |  | 58 |  |  |  | 1 |  |  |  | (10) |  |  |  | 49 |  |  |  | — |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 251 |  |  |  | — |  |  |  | (118) |  |  |  | 133 |  |  |  | (43) |
Other asset-backed |  |  | 520 |  |  |  | 2 |  |  |  | (82) |  |  |  | 440 |  |  |  | (37) |
Total fixed-maturity investments |  |  | 7,492 |  |  |  | 262 |  |  |  | (418) |  |  |  | 7,336 |  |  |  | (139) |
Money market securities |  |  | 926 |  |  |  | — |  |  |  | — |  |  |  | 926 |  |  |  | — |
Equity securities |  |  | 134 |  |  |  | 1 |  |  |  | (19) |  |  |  | 116 |  |  |  | — |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed non-agency |  |  | 119 |  |  |  | — |  |  |  | (26) |  |  |  | 93 |  |  |  | — |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 112 |  |  |  | — |  |  |  | (15) |  |  |  | 97 |  |  |  | — |
Other asset-backed |  |  | 41 |  |  |  | — |  |  |  | — |  |  |  | 41 |  |  |  | — |
Money market securities |  |  | 199 |  |  |  | — |  |  |  | — |  |  |  | 199 |  |  |  | — |
Total AFS investments |  | $ | 9,025 |  |  | $ | 263 |  |  | $ | (478) |  |  | $ | 8,810 |  |  | $ | (139) |
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  | $ | 2,840 |  |  | $ | — |  |  | $ | (371) |  |  | $ | 2,469 |  |  | $ | — |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other asset-backed |  |  | 1,003 |  |  |  | 17 |  |  |  | — |  |  |  | 1,020 |  |  |  | — |
Total HTM investments |  | $ | 3,843 |  |  | $ | 17 |  |  | $ | (371) |  |  | $ | 3,489 |  |  | $ | — |
(1)—Represents unrealized gains or losses on other than temporarily impaired securities recognized in accumulated other comprehensive income (loss), which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in accumulated other comprehensive income (loss).
Distribution Of Securities By Contractual Maturity Of AFS and HTM |
|  | AFS Securities |  |  | HTM Securities |
|  |  |  |  |  |  |  | Consolidated VIEs |  |  | Consolidated VIEs |
In millions |  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 241 |  |  | $ | 242 |  |  | $ | 18 |  |  | $ | 18 |  |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 1,044 |  |  |  | 1,061 |  |  |  | 113 |  |  |  | 122 |  |  |  | — |  |  |  | — |
Due after five years through ten years |  |  | 770 |  |  |  | 803 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Due after ten years through fifteen years |  |  | 403 |  |  |  | 434 |  |  |  | 84 |  |  |  | 81 |  |  |  | — |  |  |  | — |
Due after fifteen years |  |  | 1,048 |  |  |  | 1,137 |  |  |  | — |  |  |  | — |  |  |  | 2,829 |  |  |  | 2,674 |
Mortgage-backed and asset-backed |  |  | 1,377 |  |  |  | 1,316 |  |  |  | 212 |  |  |  | 194 |  |  |  | — |  |  |  | — |
Total fixed-maturity investments |  | $ | 4,883 |  |  | $ | 4,993 |  |  | $ | 427 |  |  | $ | 415 |  |  | $ | 2,829 |  |  | $ | 2,674 |
Net Unrealized Gains (Losses), Including Portion Of Other-Than-Temporary Impairments Included In Accumulated Other Comprehensive Income (Loss) |
|  | As of December 31, |
In millions |  | 2012 |  |  | 2011 |
Gross unrealized gains |  | $ | 251 |  |  | $ | 263 |
Gross unrealized losses |  |  | (152) |  |  |  | (478) |
Foreign exchange |  |  | 24 |  |  |  | (5) |
Total |  |  | 123 |  |  |  | (220) |
Deferred income tax provision (benefit) |  |  | 31 |  |  |  | (86) |
Unrealized gains (losses), net |  | $ | 92 |  |  | $ | (134) |
Gross Unrealized Losses Related To AFS And HTM Investments |
|  | December 31, 2012 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
In millions |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agency |  | $ | 234 |  |  | $ | (1) |  |  | $ | — |  |  | $ | — |  |  | $ | 234 |  |  | $ | (1) |
State and municipal bonds |  |  | 69 |  |  |  | — |  |  |  | 87 |  |  |  | (12) |  |  |  | 156 |  |  |  | (12) |
Foreign governments |  |  | 11 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 12 |  |  |  | — |
Corporate obligations |  |  | 202 |  |  |  | (2) |  |  |  | 57 |  |  |  | (18) |  |  |  | 259 |  |  |  | (20) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed agency |  |  | 173 |  |  |  | (1) |  |  |  | 38 |  |  |  | — |  |  |  | 211 |  |  |  | (1) |
Residential mortgage-backed non-agency |  |  | 4 |  |  |  | — |  |  |  | 28 |  |  |  | (8) |  |  |  | 32 |  |  |  | (8) |
Commercial mortgage-backed |  |  | 3 |  |  |  | — |  |  |  | 27 |  |  |  | (4) |  |  |  | 30 |  |  |  | (4) |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 1 |  |  |  | — |  |  |  | 80 |  |  |  | (71) |  |  |  | 81 |  |  |  | (71) |
Other asset-backed |  |  | 4 |  |  |  | — |  |  |  | 65 |  |  |  | (11) |  |  |  | 69 |  |  |  | (11) |
Total fixed-maturity investments |  |  | 701 |  |  |  | (4) |  |  |  | 383 |  |  |  | (124) |  |  |  | 1,084 |  |  |  | (128) |
Equity securities |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 2 |  |  |  | — |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  |  | — |  |  |  | — |  |  |  | 31 |  |  |  | (6) |  |  |  | 31 |  |  |  | (6) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed non-agency |  |  | — |  |  |  | — |  |  |  | 82 |  |  |  | (10) |  |  |  | 82 |  |  |  | (10) |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | — |  |  |  | — |  |  |  | 85 |  |  |  | (8) |  |  |  | 85 |  |  |  | (8) |
Total AFS investments |  | $ | 702 |  |  | $ | (4) |  |  | $ | 582 |  |  | $ | (148) |  |  | $ | 1,284 |  |  | $ | (152) |
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  | $ | 297 |  |  | $ | (19) |  |  | $ | 1,287 |  |  | $ | (138) |  |  | $ | 1,584 |  |  | $ | (157) |
Total HTM investments |  | $ | 297 |  |  | $ | (19) |  |  | $ | 1,287 |  |  | $ | (138) |  |  | $ | 1,584 |  |  | $ | (157) |
|  | December 31, 2011 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
In millions |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
AFS Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-maturity investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agency |  | $ | 200 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 200 |  |  | $ | — |
State and municipal bonds |  |  | 166 |  |  |  | (2) |  |  |  | 151 |  |  |  | (17) |  |  |  | 317 |  |  |  | (19) |
Foreign governments |  |  | 20 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 20 |  |  |  | — |
Corporate obligations |  |  | 297 |  |  |  | (15) |  |  |  | 418 |  |  |  | (91) |  |  |  | 715 |  |  |  | (106) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed agency |  |  | 20 |  |  |  | — |  |  |  | 49 |  |  |  | — |  |  |  | 69 |  |  |  | — |
Residential mortgage-backed non-agency |  |  | 34 |  |  |  | (5) |  |  |  | 167 |  |  |  | (78) |  |  |  | 201 |  |  |  | (83) |
Commercial mortgage-backed |  |  | 17 |  |  |  | (2) |  |  |  | 22 |  |  |  | (8) |  |  |  | 39 |  |  |  | (10) |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 13 |  |  |  | (2) |  |  |  | 117 |  |  |  | (116) |  |  |  | 130 |  |  |  | (118) |
Other asset-backed |  |  | 53 |  |  |  | (7) |  |  |  | 328 |  |  |  | (75) |  |  |  | 381 |  |  |  | (82) |
Total fixed-maturity investments |  |  | 820 |  |  |  | (33) |  |  |  | 1,252 |  |  |  | (385) |  |  |  | 2,072 |  |  |  | (418) |
Equity securities |  |  | 47 |  |  |  | (3) |  |  |  | 45 |  |  |  | (16) |  |  |  | 92 |  |  |  | (19) |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed non-agency |  |  | 3 |  |  |  | — |  |  |  | 90 |  |  |  | (26) |  |  |  | 93 |  |  |  | (26) |
Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized debt obligations |  |  | 9 |  |  |  | — |  |  |  | 88 |  |  |  | (15) |  |  |  | 97 |  |  |  | (15) |
Other asset-backed |  |  | 31 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 31 |  |  |  | — |
Total AFS investments |  | $ | 912 |  |  | $ | (36) |  |  | $ | 1,475 |  |  | $ | (442) |  |  | $ | 2,387 |  |  | $ | (478) |
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate obligations |  | $ | 284 |  |  | $ | (31) |  |  | $ | 2,185 |  |  | $ | (340) |  |  | $ | 2,469 |  |  | $ | (371) |
Total HTM investments |  | $ | 284 |  |  | $ | (31) |  |  | $ | 2,185 |  |  | $ | (340) |  |  | $ | 2,469 |  |  | $ | (371) |
Distribution Of Securities By Percentage Of Fair Value Below Book Value By More Than 5% |
Percentage Book Value Exceeded Market Value |  | Number of Securities |  |  | Book Value (in millions) |  |  | Fair Value (in millions) |
> 5% to 15% |  |  | 31 |  |  | $ | 309 |  |  | $ | 278 |
> 15% to 25% |  |  | 18 |  |  |  | 682 |  |  |  | 549 |
> 25% to 50% |  |  | 13 |  |  |  | 69 |  |  |  | 45 |
> 50% |  |  | 27 |  |  |  | 87 |  |  |  | 18 |
Total |  |  | 89 |  |  | $ | 1,147 |  |  | $ | 890 |
Fair Values And Gross Unrealized Losses By Credit Rating Category Of ABS, MBS And Corporate Obligations |
In millions |  | Aaa |  |  | Aa |  |  | A |  |  | Baa |  |  | Below Investment Grade |  |  | Not Rated |  |  | Total |
Asset Type |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
ABS |  | $ | 32 |  |  | $ | (3) |  |  | $ | 64 |  |  | $ | (5) |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 134 |  |  | $ | (81) |  |  | $ | 1 |  |  | $ | (1) |  |  | $ | 235 |  |  | $ | (90) |
MBS |  |  | 214 |  |  |  | (1) |  |  |  | 84 |  |  |  | (10) |  |  |  | 1 |  |  |  | — |  |  |  | 27 |  |  |  | (3) |  |  |  | 15 |  |  |  | (3) |  |  |  | 14 |  |  |  | (6) |  |  |  | 355 |  |  |  | (23) |
Corporate obligations |  |  | 31 |  |  |  | — |  |  |  | 40 |  |  |  | (1) |  |  |  | 158 |  |  |  | (9) |  |  |  | 46 |  |  |  | (14) |  |  |  | 15 |  |  |  | (2) |  |  |  | — |  |  |  | — |  |  |  | 290 |  |  |  | (26) |
Total |  | $ | 277 |  |  | $ | (4) |  |  | $ | 188 |  |  | $ | (16) |  |  | $ | 162 |  |  | $ | (9) |  |  | $ | 74 |  |  | $ | (17) |  |  | $ | 164 |  |  | $ | (86) |  |  | $ | 15 |  |  | $ | (7) |  |  | $ | 880 |  |  | $ | (139) |
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 |
Asset Type |  | Average Credit Rating with the Effect of Guarantee |  | Average Credit Rating without the Effect of Guarantee |  | (in millions) |  |  | Percentage |
|  |  | Fair Value |  |
ABS |  | Below investment grade |  | Below investment grade |  | $ | 101 |  |  |  | 65% |
MBS |  | A |  | Below investment grade |  |  | 113 |  |  |  | 96% |
Corporate obligations |  | Baa |  | Baa |  |  | — |  |  |  | —% |
Significant Inputs Used In Measurement Of Credit Losses On Securities |
|  | Years Ended December 31, |
Significant Inputs |  | 2012 |  |  | 2011 |  |  | 2010 |
Expected size of losses(1): |  |  |  |  |  |  |  |  |  |  |  |
Range(2) |  |  | 12.13% to 97.70% |  |  |  | 2.48% to 100.00% |  |  |  | 0.21% to 100.00% |
Weighted average(3) |  |  | 87.67% |  |  |  | 55.40% |  |  |  | 52.20% |
Current subordination levels(4): |  |  |  |  |  |  |  |  |  |  |  |
Range(2) |  |  | 0.00% to 0.00% |  |  |  | 0.00% to 35.46% |  |  |  | 0.00% to 42.16% |
Weighted average(3) |  |  | 0.00% |  |  |  | 1.53% |  |  |  | 4.50% |
Prepayment speed (annual CPR)(5): |  |  |  |  |  |  |  |  |  |  |  |
Range(2) |  |  | 0.00% to 30.91% |  |  |  | 0.00% to 100.00% |  |  |  | 0.00% to 40.20% |
Weighted average(3) |  |  | 11.93% |  |  |  | 12.67% |  |  |  | 9.45% |
(1)—Represents future expected credit losses on impaired assets expressed as a percentage of total outstanding balance. (2)—Represents the range of inputs/assumptions based upon the individual securities within each category. (3)—Calculated by weighting the relevant input/assumption for each individual security by the outstanding notional of the security. (4)—Represents current level of credit protection (subordination) for the securities, expressed as a percentage of the balance of the collateral group backing the bond. (5)—Values represent high and low points of lifetime vectors of constant prepayment rates.
Securities Held In Unrealized Loss Position And Insured By Financial Guarantor And The Related Insurance Loss Reserve On Company Insured Investments |
In millions |  | Fair Value |  |  | Unrealized Loss |  |  | Insurance Loss Reserve (2) |
Asset-backed: |  |  |  |  |  |  |  |  |  |  |  |
MBIA(1) |  | $ | 148 |  |  | $ | (58) |  |  | $ | 16 |
Other |  |  | 9 |  |  |  | (5) |  |  |  | — |
Total asset-backed |  |  | 157 |  |  |  | (63) |  |  |  | 16 |
Mortgage-backed: |  |  |  |  |  |  |  |  |  |  |  |
MBIA(1) |  |  | 6 |  |  |  | — |  |  |  | — |
Other |  |  | 111 |  |  |  | (15) |  |  |  | — |
Total mortgage-backed |  |  | 117 |  |  |  | (15) |  |  |  | — |
Corporate obligations: |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  | 10 |  |  |  | (11) |  |  |  | — |
Total corporate obligations |  |  | 10 |  |  |  | (11) |  |  |  | — |
Other: |  |  |  |  |  |  |  |  |  |  |  |
MBIA(1) |  |  | 71 |  |  |  | (12) |  |  |  | — |
Other |  |  | 8 |  |  |  | — |  |  |  | — |
Total other |  |  | 79 |  |  |  | (12) |  |  |  | — |
Total |  | $ | 363 |  |  | $ | (101) |  |  | $ | 16 |
(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.
Credit Losses Recognized In Earnings Related To OTTI Losses Recognized In Accumulated Other Comprehensive Income (Loss) |
In millions |  | Years Ended December 31, |
Credit Losses Recognized in Earnings Related to OTTI |  | 2012 |  |  | 2011 |  |  | 2010 |
Beginning balance |  | $ | 341 |  |  | $ | 262 |  |  | $ | 389 |
Accounting transition adjustment(1) |  |  | — |  |  |  | — |  |  |  | (149) |
Additions for credit loss impairments recognized in the current period on securities not previously impaired |  |  | — |  |  |  | 63 |  |  |  | 24 |
Additions for credit loss impairments recognized in the current period on securities previously impaired |  |  | 8 |  |  |  | 31 |  |  |  | 18 |
Additions for credit loss impairments recognized in prior periods for securities that were re-impaired with a non-credit component in the current period |  |  | — |  |  |  | — |  |  |  | 1 |
Reductions for credit loss impairments previously recognized on securities sold during the period |  |  | (41) |  |  |  | (15) |  |  |  | (16) |
Reductions for credit loss impairments previously recognized on securities impaired to fair value during the period(2) |  |  | (111) |  |  |  | — |  |  |  | (4) |
Reductions for increases in cash flows expected to be collected over the remaining life of the security |  |  | — |  |  |  | — |  |  |  | (1) |
Ending balance |  | $ | 197 |  |  | $ | 341 |  |  | $ | 262 |
(1)—Reflects the adoption of the accounting principles for the consolidation of VIEs. (2)—Represents circumstances where the Company determined in the current period that it intends to sell the security or it is more likely than not that it will be required to sell the security before recovery of the security’s amortized cost.
Gross Realized Gains And Losses From Sales Of Available For Sale Securities |
|  | Years Ended December 31, |
In millions |  | 2012 |  |  | 2011 |  |  | 2010 |
Gross realized gains |  | $ | 196 |  |  | $ | 239 |  |  | $ | 92 |
Gross realized losses |  |  | (127) |  |  |  | (104) |  |  |  | (30) |
Net(1) |  | $ | 69 |  |  | $ | 135 |  |  | $ | 62 |
(1)—These balances are included in the “Net gains (losses) on financial instruments at fair value and foreign exchange” line item on the Company’s consolidated statements of operations.

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