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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Text Block [Abstract] |
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Portfolios |
|  |  |  |  |  | December 31, 2018
|  |  |  |  |  |  |  |  | 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 |  | $ | 1,093 |  | $ | 26 |  | $ | (10) |  | $ | 1,109 |  | $ | -
| State and municipal bonds |  |  | 641 |  |  | 97 |  |  | (11) |  |  | 727 |  |  | 42
| Foreign governments |  |  | 9 |  |  | - |  |  | - |  |  | 9 |  |  | -
| Corporate obligations |  |  | 1,473 |  |  | 6 |  |  | (131) |  |  | 1,348 |  |  | (68)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 218 |  |  | 1 |  |  | (5) |  |  | 214 |  |  | -
|  | Residential mortgage-backed non-agency |  |  | 30 |  |  | 1 |  |  | (4) |  |  | 27 |  |  | -
|  | Commercial mortgage-backed |  |  | 53 |  |  | - |  |  | (2) |  |  | 51 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 122 |  |  | - |  |  | (3) |  |  | 119 |  |  | -
|  | Other asset-backed |  |  | 178 |  |  | - |  |  | (1) |  |  | 177 |  |  | -
Total AFS investments |  | $ | 3,817 |  | $ | 131 |  | $ | (167) |  | $ | 3,781 |  | $ | (26)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 890 |  | $ | 35 |  | $ | - |  | $ | 925 |  | $ | -
Total HTM investments |  | $ | 890 |  | $ | 35 |  | $ | - |  | $ | 925 |  | $ | -
_______________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(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, 2017
|  |  |  |  |  |  |  |  | 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 |  | $ | 1,317 |  | $ | 34 |  | $ | (6) |  | $ | 1,345 |  | $ | -
| State and municipal bonds |  |  | 840 |  |  | 29 |  |  | (12) |  |  | 857 |  |  | -
| Foreign governments |  |  | 10 |  |  | - |  |  | - |  |  | 10 |  |  | -
| Corporate obligations |  |  | 1,332 |  |  | 25 |  |  | (80) |  |  | 1,277 |  |  | (72)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 365 |  |  | 1 |  |  | (4) |  |  | 362 |  |  | -
|  | Residential mortgage-backed non-agency |  |  | 35 |  |  | 1 |  |  | (4) |  |  | 32 |  |  | -
|  | Commercial mortgage-backed |  |  | 66 |  |  | - |  |  | - |  |  | 66 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 116 |  |  | - |  |  | - |  |  | 116 |  |  | -
|  | Other asset-backed |  |  | 175 |  |  | - |  |  | - |  |  | 175 |  |  | 1
|  |  | Total fixed-maturity investments |  |  | 4,256 |  |  | 90 |  |  | (106) |  |  | 4,240 |  |  | (71)
Money market securities |  |  | 179 |  |  | - |  |  | - |  |  | 179 |  |  | -
Perpetual debt and equity securities |  |  | 3 |  |  | 1 |  |  | - |  |  | 4 |  |  | -
Total AFS investments |  | $ | 4,438 |  | $ | 91 |  | $ | (106) |  | $ | 4,423 |  | $ | (71)
HTM Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of consolidated VIEs: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate obligations |  | $ | 890 |  | $ | 26 |  | $ | - |  | $ | 916 |  | $ | -
Total HTM investments |  | $ | 890 |  | $ | 26 |  | $ | - |  | $ | 916 |  | $ | -
_______________ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(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 |  | $ | 820 |  | $ | 831 |  | $ | - |  | $ | -
Due after one year through five years |  |  | 715 |  |  | 741 |  |  | - |  |  | -
Due after five years through ten years |  |  | 651 |  |  | 568 |  |  | - |  |  | -
Due after ten years |  |  | 1,030 |  |  | 1,053 |  |  | 890 |  |  | 925
Mortgage-backed and asset-backed |  |  | 601 |  |  | 588 |  |  | - |  |  | -
Total fixed-maturity investments |  | $ | 3,817 |  | $ | 3,781 |  | $ | 890 |  | $ | 925
Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments |
|  |  |  |  |  | December 31, 2018
|  |  |  |  |  | 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 |  | $ | 231 |  | $ | (1) |  | $ | 278 |  | $ | (9) |  | $ | 509 |  | $ | (10)
| State and municipal bonds |  |  | 60 |  |  | (1) |  |  | 135 |  |  | (10) |  |  | 195 |  |  | (11)
| Foreign governments |  |  | 5 |  |  | - |  |  | 2 |  |  | - |  |  | 7 |  |  | -
| Corporate obligations |  |  | 900 |  |  | (41) |  |  | 335 |  |  | (90) |  |  | 1,235 |  |  | (131)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 29 |  |  | (1) |  |  | 118 |  |  | (4) |  |  | 147 |  |  | (5)
|  | Residential mortgage-backed non-agency |  |  | 2 |  |  | - |  |  | 13 |  |  | (4) |  |  | 15 |  |  | (4)
|  | Commercial mortgage-backed |  |  | 24 |  |  | - |  |  | 21 |  |  | (2) |  |  | 45 |  |  | (2)
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 98 |  |  | (3) |  |  | 7 |  |  | - |  |  | 105 |  |  | (3)
|  | Other asset-backed |  |  | 127 |  |  | - |  |  | 35 |  |  | (1) |  |  | 162 |  |  | (1)
Total AFS investments |  | $ | 1,476 |  | $ | (47) |  | $ | 944 |  | $ | (120) |  | $ | 2,420 |  | $ | (167)
|  |  |  |  |  | December 31, 2017
|  |  |  |  |  | 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 |  | $ | 353 |  | $ | (1) |  | $ | 124 |  | $ | (5) |  | $ | 477 |  | $ | (6)
| State and municipal bonds |  |  | 203 |  |  | (8) |  |  | 116 |  |  | (4) |  |  | 319 |  |  | (12)
| Foreign governments |  |  | 8 |  |  | - |  |  | - |  |  | - |  |  | 8 |  |  | -
| Corporate obligations |  |  | 425 |  |  | (3) |  |  | 163 |  |  | (77) |  |  | 588 |  |  | (80)
| Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Residential mortgage-backed agency |  |  | 105 |  |  | (1) |  |  | 156 |  |  | (3) |  |  | 261 |  |  | (4)
|  | Residential mortgage-backed non-agency |  |  | - |  |  | - |  |  | 14 |  |  | (4) |  |  | 14 |  |  | (4)
|  | Commercial mortgage-backed |  |  | 27 |  |  | - |  |  | 5 |  |  | - |  |  | 32 |  |  | -
| Asset-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Collateralized debt obligations |  |  | 12 |  |  | - |  |  | - |  |  | - |  |  | 12 |  |  | -
|  | Other asset-backed |  |  | 71 |  |  | - |  |  | 39 |  |  | - |  |  | 110 |  |  | -
Total AFS investments |  | $ | 1,204 |  | $ | (13) |  | $ | 617 |  | $ | (93) |  | $ | 1,821 |  | $ | (106)
Distribution Of Securities By Percentage Of Fair Value Below Book Value By More Than 5% |
|  |  | AFS Securities
| Percentage of Fair Value |  | Number of |  | Book Value |  | Fair Value
| Below Book Value |  | Securities |  | (in millions) |  | (in millions)
| > 5% to 15% |  | 47 |  | $ | 299 |  | $ | 273
| > 15% to 25% |  | 11 |  |  | 35 |  |  | 29
| > 25% to 50% |  | 3 |  |  | 12 |  |  | 9
| > 50% |  | 3 |  |  | 99 |  |  | 30
| Total |  | 64 |  | $ | 445 |  | $ | 341
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 |  | 2018 |  | 2017 |  | 2016
Beginning balance |  | $ | 32 |  | $ | 29 |  | $ | 26
Additions for credit loss impairments recognized in the |  |  |  |  |  |  |  |  |
| current period on securities not previously impaired |  |  | - |  |  | 11 |  |  | -
Additions for credit loss impairments recognized in the |  |  |  |  |  |  |  |  |
| current period on securities previously impaired |  |  | 5 |  |  | 5 |  |  | 4
Reductions for credit loss impairments previously recognized |  |  |  |  |  |  |  |  |
| on securities sold during the period |  |  | - |  |  | (2) |  |  | (1)
Reductions for credit loss impairments previously recognized on securities |  |  |  |  |  |  |  |  |
| impaired to fair value during the period |  |  | - |  |  | (11) |  |  | -
Ending balance |  | $ | 37 |  | $ | 32 |  | $ | 29
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) |
| Mortgage-backed: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  | $ | 13 |  | $ | (4) |  | $ | 15 |
| Corporate obligations: |  |  |  |  |  |  |  |  |  |
|  | MBIA(1) |  |  | 81 |  |  | (8) |  |  | - |
| Other: |  |  |  |  |  |  |  |  |  |
|  | Other |  |  | 1 |  |  | - |  |  | - |
| Total |  | $ | 95 |  | $ | (12) |  | $ | 15 |
| _______________ |  |  |  |  |  |  |  |  |  |
| (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 |
|  |  |  | Years Ended December 31, |
| In millions |  | 2018 |  | 2017 |  | 2016 |
| Proceeds from sales |  | $ | 2,117 |  | $ | 2,256 |  | $ | 2,412 |
| Gross realized gains |  | $ | 6 |  | $ | 40 |  | $ | 84 |
| Gross realized losses |  | $ | (19) |  | $ | (22) |  | $ | (23) |
Portion Of Unrealized Gains Losses Recognized On Equity Investments [Table Text Block] |
|  |  | Year Ended
In millions |  | December 31, 2018
Net gains and (losses) recognized during the period on equity securities |  | $ | (4)
Less: |  |  |
Net gains and (losses) recognized during the period on equity securities sold during the period |  |  | 1
Unrealized gains and (losses) recognized during the period on equity securities still held |  |  |
as of December 31, 2018 |  | $ | (5)

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