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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value of Financial Assets and Liabilities | Financial assets and liabilities measured at fair value on a recurring basis on the consolidated balance sheets at December 31, 2018 and 2017 were as follows:
In millions | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2018 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
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 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
U.S. corporate securities | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Foreign securities | — |  |  | 110 |  |  | — |  |  | 110 |
Total debt securities | — |  |  | 111 |  |  | — |  |  | 111 |
Equity securities | — |  |  | — |  |  | — |  |  | — |
Derivative financial instruments | — |  |  | 5 |  |  | — |  |  | 5 |
Total assets | $ | — |  |  | $ | 116 |  |  | $ | — |  |  | $ | 116 |
Liabilities: |  |  |  |  |  |  |
Derivative financial instruments | $ | — |  |  | $ | 23 |  |  | $ | — |  |  | $ | 23 |
Carrying Value and Estimated Fair Value of Certain Financial Instruments | The carrying value and estimated fair value classified by level of fair value hierarchy for financial instruments carried on the consolidated balance sheets at adjusted cost or contract value at December 31, 2018 and 2017 were as follows:
| Carrying Value |  | Estimated Fair Value
In millions |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
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 |
| Carrying Value |  | Estimated Fair Value
In millions |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
December 31, 2017 |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Equity securities (1) | $ | 47 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Liabilities: |  |  |  |  |  |  |  |  |
Long-term debt | 25,726 |  |  | 26,756 |  |  | — |  |  | — |  |  | 26,756 |
_____________________________________________
(1) | It was not practical to estimate the fair value of these cost-method investments as it represents shares of unlisted companies. See Note 1 ‘‘Significant Accounting Policies’’ for additional information regarding the valuation of cost-method investments.
Separate Account Financial Assets | Separate Accounts financial assets as of December 31, 2018 were as follows:
In millions | Level 1 |  | Level 2 |  | Level 3 |  | Total
Debt securities | $ | 782 |  |  | $ | 2,500 |  |  | $ | 4 |  |  | $ | 3,286 |
Equity securities | — |  |  | 3 |  |  | — |  |  | 3 |
Common/collective trusts | — |  |  | 404 |  |  | — |  |  | 404 |
Total (1) | $ | 782 |  |  | $ | 2,907 |  |  | $ | 4 |  |  | $ | 3,693 |
_____________________________________________
(1) | Excludes $191 million of cash and cash equivalents and accounts receivable at December 31, 2018.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value of assets, by major investment asset category, supporting separate accounts with additional insurance benefits and minimum investment return guarantees as of each date for which a statement of financial position is presented. The taxonomy for investment disclosures is utilized to tag elements that represent more detailed breakdowns of the major investment categories specified in reporting regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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