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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | Financial assets measured at fair value on a recurring basis on the condensed consolidated balance sheets at September 30, 2019 and December 31, 2018 were as follows:
In millions | Level 1 |  | Level 2 |  | Level 3 |  | Total
September 30, 2019 |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
U.S. government securities | $ | 1,746 |  |  | $ | 80 |  |  | $ | — |  |  | $ | 1,826 |
States, municipalities and political subdivisions | — |  |  | 2,353 |  |  | — |  |  | 2,353 |
U.S. corporate securities | — |  |  | 7,596 |  |  | 41 |  |  | 7,637 |
Foreign securities | — |  |  | 2,284 |  |  | 5 |  |  | 2,289 |
Residential mortgage-backed securities | — |  |  | 554 |  |  | — |  |  | 554 |
Commercial mortgage-backed securities | — |  |  | 701 |  |  | — |  |  | 701 |
Other asset-backed securities | — |  |  | 1,358 |  |  | — |  |  | 1,358 |
Redeemable preferred securities | — |  |  | 28 |  |  | 12 |  |  | 40 |
Total debt securities | 1,746 |  |  | 14,954 |  |  | 58 |  |  | 16,758 |
Equity securities | 32 |  |  | — |  |  | 36 |  |  | 68 |
Total | $ | 1,778 |  |  | $ | 14,954 |  |  | $ | 94 |  |  | $ | 16,826 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |
U.S. government securities | $ | 1,597 |  |  | $ | 91 |  |  | $ | — |  |  | $ | 1,688 |
States, municipalities and political subdivisions | — |  |  | 2,399 |  |  | — |  |  | 2,399 |
U.S. corporate securities | — |  |  | 6,422 |  |  | 67 |  |  | 6,489 |
Foreign securities | — |  |  | 2,380 |  |  | 3 |  |  | 2,383 |
Residential mortgage-backed securities | — |  |  | 577 |  |  | — |  |  | 577 |
Commercial mortgage-backed securities | — |  |  | 605 |  |  | — |  |  | 605 |
Other asset-backed securities | — |  |  | 1,085 |  |  | — |  |  | 1,085 |
Redeemable preferred securities | — |  |  | 22 |  |  | 7 |  |  | 29 |
Total debt securities | 1,597 |  |  | 13,581 |  |  | 77 |  |  | 15,255 |
Equity securities | 19 |  |  | — |  |  | 54 |  |  | 73 |
Total | $ | 1,616 |  |  | $ | 13,581 |  |  | $ | 131 |  |  | $ | 15,328 |
Fair Value, by Balance Sheet Grouping | The carrying value and estimated fair value classified by level of fair value hierarchy for financial instruments carried on the condensed consolidated balance sheets at adjusted cost or contract value at September 30, 2019 and December 31, 2018 were as follows:
| Carrying Value |  | Estimated Fair Value
In millions |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
September 30, 2019 |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Mortgage loans | $ | 1,290 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,317 |  |  | $ | 1,317 |
Equity securities (1) | 142 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Liabilities: |  |  |  |  |  |  |  |  |
Investment contract liabilities: |  |  |  |  |  |  |  |  |
With a fixed maturity | 5 |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Without a fixed maturity | 372 |  |  | — |  |  | — |  |  | 385 |  |  | 385 |
Long-term debt | 67,984 |  |  | 72,823 |  |  | — |  |  | — |  |  | 72,823 |
December 31, 2018 |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Mortgage loans | $ | 1,361 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,366 |  |  | $ | 1,366 |
Equity securities (1) | 140 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Investment contract liabilities: |  |  |  |  |  |  |  |  |  |  |
With a fixed maturity | 5 |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Without a fixed maturity | 382 |  |  | — |  |  | — |  |  | 357 |  |  | 357 |
Long-term debt | 72,709 |  |  | 71,252 |  |  | — |  |  | — |  |  | 71,252 |
_____________________________________________
(1) | It was not practical to estimate the fair value of these cost-method investments as it represents shares of unlisted companies.
Schedule of Fair Value of Separate Accounts by Major Category of Investment | Separate Accounts financial assets as of September 30, 2019 and December 31, 2018 were as follows:
|  | September 30, 2019 |  | December 31, 2018
In millions |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Debt securities |  | $ | 1,207 |  |  | $ | 2,609 |  |  | $ | — |  |  | $ | 3,816 |  |  | $ | 782 |  |  | $ | 2,500 |  |  | $ | 4 |  |  | $ | 3,286 |
Equity securities |  | — |  |  | 2 |  |  | — |  |  | 2 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Common/collective trusts |  | — |  |  | 513 |  |  | — |  |  | 513 |  |  | — |  |  | 404 |  |  | — |  |  | 404 |
Total (1) |  | $ | 1,207 |  |  | $ | 3,124 |  |  | $ | — |  |  | $ | 4,331 |  |  | $ | 782 |  |  | $ | 2,907 |  |  | $ | 4 |  |  | $ | 3,693 |
_____________________________________________
(1) | Excludes $259 million and $191 million of cash and cash equivalents and accounts receivable at September 30, 2019 and December 31, 2018, respectively.

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