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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Financial assets measured at fair value on a recurring basis on the condensed consolidated balance sheets at March 31, 2019 and December 31, 2018 were as follows:
In millions | Level 1 |  | Level 2 |  | Level 3 |  | Total
March 31, 2019 |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |
U.S. government securities | $ | 1,665 |  |  | $ | 79 |  |  | $ | — |  |  | $ | 1,744 |
States, municipalities and political subdivisions | — |  |  | 2,317 |  |  | — |  |  | 2,317 |
U.S. corporate securities | — |  |  | 7,006 |  |  | 58 |  |  | 7,064 |
Foreign securities | — |  |  | 2,350 |  |  | 3 |  |  | 2,353 |
Residential mortgage-backed securities | — |  |  | 595 |  |  | — |  |  | 595 |
Commercial mortgage-backed securities | — |  |  | 637 |  |  | — |  |  | 637 |
Other asset-backed securities | — |  |  | 1,149 |  |  | — |  |  | 1,149 |
Redeemable preferred securities | — |  |  | 27 |  |  | 11 |  |  | 38 |
Total debt securities | 1,665 |  |  | 14,160 |  |  | 72 |  |  | 15,897 |
Equity securities | 9 |  |  | — |  |  | 71 |  |  | 80 |
Total | $ | 1,674 |  |  | $ | 14,160 |  |  | $ | 143 |  |  | $ | 15,977 |
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 [Table Text Block] | 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 March 31, 2019 and December 31, 2018 were as follows:
| Carrying Value |  | Estimated Fair Value
In millions |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
March 31, 2019 |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Mortgage loans | $ | 1,338 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,350 |  |  | $ | 1,350 |
Equity securities (1) | 135 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Liabilities: |  |  |  |  |  |  |  |  |
Investment contract liabilities: |  |  |  |  |  |  |  |  |
With a fixed maturity | 5 |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Without a fixed maturity | 377 |  |  | — |  |  | — |  |  | 364 |  |  | 364 |
Long-term debt | 71,781 |  |  | 72,376 |  |  | — |  |  | — |  |  | 72,376 |
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 [Table Text Block] | Separate Accounts financial assets as of March 31, 2019 and December 31, 2018 were as follows:
|  | March 31, 2019 |  | December 31, 2018
In millions |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Debt securities |  | $ | 983 |  |  | $ | 2,445 |  |  | $ | — |  |  | $ | 3,428 |  |  | $ | 782 |  |  | $ | 2,500 |  |  | $ | 4 |  |  | $ | 3,286 |
Equity securities |  | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Common/collective trusts |  | — |  |  | 415 |  |  | — |  |  | 415 |  |  | — |  |  | 404 |  |  | — |  |  | 404 |
Total (1) |  | $ | 983 |  |  | $ | 2,863 |  |  | $ | — |  |  | $ | 3,846 |  |  | $ | 782 |  |  | $ | 2,907 |  |  | $ | 4 |  |  | $ | 3,693 |
_____________________________________________
(1) | Excludes $228 million and $191 million of cash and cash equivalents and accounts receivable at March 31, 2019 and December 31, 2018, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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