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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Text Block [Abstract] |
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Portfolios |
|  |  |  |  |  | December 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 |  | $ | 909 |  | $ | 30 |  | $ | (10) |  | $ | 929 |  | $ | -
| State and municipal bonds |  |  | 1,382 |  |  | 72 |  |  | (15) |  |  | 1,439 |  |  | -
| Foreign governments |  |  | 8 |  |  | - |  |  | - |  |  | 8 |  |  | -
| Corporate obligations |  |  | 1,352 |  |  | 20 |  |  | (102) |  |  | 1,270 |  |  | (73)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 871 |  |  | 3 |  |  | (12) |  |  | 862 |  |  | -
|  | Residential mortgage-backed non-agency |  |  | 50 |  |  | 1 |  |  | (6) |  |  | 45 |  |  | (3)
|  | Commercial mortgage-backed |  |  | 41 |  |  | - |  |  | - |  |  | 41 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 22 |  |  | - |  |  | - |  |  | 22 |  |  | -
|  | Other asset-backed |  |  | 294 |  |  | 2 |  |  | (3) |  |  | 293 |  |  | 1
|  |  | Total fixed-maturity investments |  |  | 4,929 |  |  | 128 |  |  | (148) |  |  | 4,909 |  |  | (75)
Money market securities |  |  | 517 |  |  | - |  |  | - |  |  | 517 |  |  | -
Perpetual debt and equity securities |  |  | 4 |  |  | 1 |  |  | - |  |  | 5 |  |  | -
Total AFS investments |  | $ | 5,450 |  | $ | 129 |  | $ | (148) |  | $ | 5,431 |  | $ | (75)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 890 |  | $ | - |  | $ | (14) |  | $ | 876 |  | $ | -
Total HTM investments |  | $ | 890 |  | $ | - |  | $ | (14) |  | $ | 876 |  | $ | -
_______________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(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 |  | $ | 334 |  | $ | 334 |  | $ | - |  | $ | -
Due after one year through five years |  |  | 1,206 |  |  | 1,221 |  |  | - |  |  | -
Due after five years through ten years |  |  | 784 |  |  | 725 |  |  | - |  |  | -
Due after ten years |  |  | 1,327 |  |  | 1,366 |  |  | 890 |  |  | 876
Mortgage-backed and asset-backed |  |  | 1,278 |  |  | 1,263 |  |  | - |  |  | -
Total fixed-maturity investments |  | $ | 4,929 |  | $ | 4,909 |  | $ | 890 |  | $ | 876
Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments |
|  |  |  |  |  | December 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 |  | $ | 432 |  | $ | (10) |  | $ | - |  | $ | - |  | $ | 432 |  | $ | (10)
| State and municipal bonds |  |  | 339 |  |  | (13) |  |  | 18 |  |  | (2) |  |  | 357 |  |  | (15)
| Foreign governments |  |  | 5 |  |  | - |  |  | - |  |  | - |  |  | 5 |  |  | -
| Corporate obligations |  |  | 534 |  |  | (29) |  |  | 52 |  |  | (73) |  |  | 586 |  |  | (102)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 436 |  |  | (9) |  |  | 122 |  |  | (3) |  |  | 558 |  |  | (12)
|  | Residential mortgage-backed non-agency |  |  | 1 |  |  | - |  |  | 29 |  |  | (6) |  |  | 30 |  |  | (6)
|  | Commercial mortgage-backed |  |  | 6 |  |  | - |  |  | 15 |  |  | - |  |  | 21 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 7 |  |  | - |  |  | 15 |  |  | - |  |  | 22 |  |  | -
|  | Other asset-backed |  |  | 112 |  |  | (1) |  |  | 49 |  |  | (2) |  |  | 161 |  |  | (3)
Total AFS investments |  | $ | 1,872 |  | $ | (62) |  | $ | 300 |  | $ | (86) |  | $ | 2,172 |  | $ | (148)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | - |  | $ | - |  | $ | 876 |  | $ | (14) |  | $ | 876 |  | $ | (14)
Total HTM investments |  | $ | - |  | $ | - |  | $ | 876 |  | $ | (14) |  | $ | 876 |  | $ | (14)
|  |  |  |  |  | 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% |  | 6 |  | $ | 53 |  | $ | 50 |  | - |  | $ | - |  | $ | -
| > 15% to 25% |  | 4 |  |  | 32 |  |  | 26 |  | - |  |  | - |  |  | -
| > 25% to 50% |  | 1 |  |  | 1 |  |  | 1 |  | - |  |  | - |  |  | -
| > 50% |  | 1 |  |  | 102 |  |  | 29 |  | - |  |  | - |  |  | -
| Total |  | 12 |  | $ | 188 |  | $ | 106 |  | - |  | $ | - |  | $ | -
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 |  | $ | 115 |  | $ | (1) |  | $ | 25 |  | $ | - |  | $ | 3 |  | $ | - |  | $ | 3 |  | $ | - |  | $ | 37 |  | $ | (2) |  | $ | - |  | $ | - |  | $ | 183 |  | $ | (3)
MBS |  |  | 563 |  |  | (12) |  |  | 13 |  |  | - |  |  | - |  |  | - |  |  | 3 |  |  | - |  |  | 18 |  |  | (3) |  |  | 12 |  |  | (3) |  |  | 609 |  |  | (18)
Corporate obligations |  |  | 102 |  |  | (10) |  |  | 143 |  |  | (7) |  |  | 237 |  |  | (9) |  |  | 72 |  |  | (3) |  |  | 3 |  |  | - |  |  | 29 |  |  | (73) |  |  | 586 |  |  | (102)
| Total |  | $ | 780 |  | $ | (23) |  | $ | 181 |  | $ | (7) |  | $ | 240 |  | $ | (9) |  | $ | 78 |  | $ | (3) |  | $ | 58 |  | $ | (5) |  | $ | 41 |  | $ | (76) |  | $ | 1,378 |  | $ | (123)
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 |  | $ | 37 |  | 72 | %
MBS |  | Below Investment Grade |  | Below Investment Grade |  | $ | 17 |  | 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) |  | $ | 51 |  | $ | (2) |  | $ | 4 |
| Mortgage-backed: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  |  | 17 |  |  | (3) |  |  | 15 |
| Other: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  |  | 14 |  |  | (1) |  |  | - |
| Total |  | $ | 82 |  | $ | (6) |  | $ | 19 |
| _______________ |  |  |  |  |  |  |  |  |  |
| (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 |  | 2016 |  | 2015 |  | 2014 |
Beginning balance |  | $ | 26 |  | $ | 16 |  | $ | 175 |
Additions for credit loss impairments recognized in the |  |  |  |  |  |  |  |  |  |
| current period on securities not previously impaired |  |  | - |  |  | - |  |  | 15 |
Additions for credit loss impairments recognized in the |  |  |  |  |  |  |  |  |  |
| current period on securities previously impaired |  |  | 4 |  |  | 10 |  |  | 1 |
Reductions for credit loss impairments previously recognized |  |  |  |  |  |  |  |  |  |
| on securities sold during the period |  |  | (1) |  |  | - |  |  | (174) |
Reductions for increases in cash flows expected to be collected over the |  |  |  |  |  |  |  |  |  |
| remaining life of the security |  |  | - |  |  | - |  |  | (1) |
Ending balance |  | $ | 29 |  | $ | 26 |  | $ | 16 |
Gross Realized Gains and Losses From Sales Of Available-For-Sale Securities |
|  |  |  | Years Ended December 31, |
| In millions |  | 2016 |  | 2015 |  | 2014 |
| Proceeds from sales |  | $ | 2,412 |  | $ | 1,145 |  | $ | 757 |
| Gross realized gains |  | $ | 84 |  | $ | 32 |  | $ | 66 |
| Gross realized losses |  | $ | (23) |  | $ | (16) |  | $ | (15) |

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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 amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
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