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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Long-term debt |
|  |  | As of December 31, |
| In millions |  | 2017 |  | 2016 |
| 6.400% Senior Notes due 2022 (1) |  | $ | 265 |  | $ | 266 |
| 7.000% Debentures due 2025 |  |  | 46 |  |  | 46 |
| 7.150% Debentures due 2027 |  |  | 100 |  |  | 100 |
| 6.625% Debentures due 2028 |  |  | 141 |  |  | 141 |
| 5.700% Senior Notes due 2034 (2) |  |  | 21 |  |  | 21 |
| Surplus Notes due 2033 (3) |  |  | 940 |  |  | 940 |
| Accrued interest |  |  | 624 |  |  | 506 |
| Debt issuance costs |  |  | (16) |  |  | (34) |
| Total |  | $ | 2,121 |  | $ | 1,986 |
| ________________ |  |  |  |  |  |
| (1) - Callable on or after August 15, 2006 at par. |
| (2) - Callable anytime at the greater of par or the present value of the remaining scheduled |
| payments of principal and interest. |
| (3) - Contractual interest rate is based on three month LIBOR plus 11.26%. |
Aggregate maturity of debt obligations |
In millions |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
Corporate debt |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 265 |  | $ | 308 |  | $ | 573
Surplus Notes due 2033 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 940 |  |  | 940
Total debt obligations due |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 265 |  | $ | 1,248 |  | $ | 1,513
Principal payments due under investment agreement obligations |
|  |  | Principal |
| In millions |  | Amount |
| Maturity date: |  |  |  |
| 2018 |  | $ | 17 |
| 2019 |  |  | 7 |
| 2020 |  |  | 35 |
| 2021 |  |  | 3 |
| 2022 |  |  | 3 |
| Thereafter (through 2037) |  |  | 328 |
| Total expected principal payments (1) |  | $ | 393 |
| Less discount and other adjustments (2) |  |  | 56 |
| Total |  | $ | 337 |
| ________________ |  |  |
| (1)- Amounts reflect principal due at maturity for investment agreements issued at a discount. |
| (2)- Includes discounts net of carrying amount adjustments of $61 million, net of accrued interest of $5 million. |
Principal payments due under medium-term note obligations based on contractual maturity |
|  |  | Principal |
| In millions |  | Amount |
| Maturity date: |  |  |  |
| 2018 |  | $ | 36 |
| 2019 |  |  | 61 |
| 2020 |  |  | - |
| 2021 |  |  | - |
| 2022 |  |  | 121 |
| Thereafter (through 2036) |  |  | 847 |
| Total expected principal payments (1) |  | $ | 1,065 |
| Less discount and other adjustments (2) |  |  | 300 |
| Total |  | $ | 765 |
| ________________ |  |  |
| (1)- Amounts reflect principal due at maturity for notes issued at a discount. |
| (2)- Includes discounts net of carrying amount adjustments and embedded derivatives of $240 million, fair value adjustments of $65 million, net of accrued interest of $5 million. |
Maturity of VIE notes, by segment |
|  |  | Principal |  |
| In millions |  | Amount |  |
| Maturity date: |  |  |  |  |
| 2018 |  | $ | 203 |  |
| 2019 |  |  | 147 |  |
| 2020 |  |  | 485 |  |
| 2021 |  |  | 132 |  |
| 2022 |  |  | 116 |  |
| Thereafter (through 2052) |  |  | 1,206 |  |
| Total |  | $ | 2,289 | (1) |
| _______________ |  |  |  |  |
| (1) - Includes $1.1 billion of VIE notes accounted for at fair value as of December 31, 2017.

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