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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Level within the fair value hierarchy at which the Company's financial assets and financial liabilities are measured on a recurring basis [Table Text Block] | The following tables present the level within the fair value hierarchy at which the Company’s financial assets and financial liabilities are measured on a recurring basis.
(as of September 30, 2025, in millions) |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Invested assets: |  |  |  |  |  |  |  |
Fixed maturities |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities |  | $ | 4,013 |  |  | $ | 4,013 |  |  | $ | — |  |  | $ | — |
Obligations of U.S. states, municipalities and political subdivisions |  | 30,304 |  |  | — |  |  | 30,304 |  |  | — |
Debt securities issued by foreign governments |  | 988 |  |  | — |  |  | 988 |  |  | — |
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities |  | 13,361 |  |  | — |  |  | 13,358 |  |  | 3 |
Corporate and all other bonds |  | 42,447 |  |  | 13 |  |  | 42,098 |  |  | 336 |
Total fixed maturities |  | 91,113 |  |  | 4,026 |  |  | 86,748 |  |  | 339 |
Equity securities |  |  |  |  |  |  |  |
Common stock |  | 649 |  |  | 642 |  |  | — |  |  | 7 |
Non-redeemable preferred stock |  | 43 |  |  | 16 |  |  | 3 |  |  | 24 |
Total equity securities |  | 692 |  |  | 658 |  |  | 3 |  |  | 31 |
Other investments |  | 22 |  |  | 22 |  |  | — |  |  | — |
Total |  | $ | 91,827 |  |  | $ | 4,706 |  |  | $ | 86,751 |  |  | $ | 370 |
(as of December 31, 2024, in millions) |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Invested assets: |  |  |  |  |  |  |  |
Fixed maturities |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government and government agencies and authorities |  | $ | 5,570 |  |  | $ | 5,570 |  |  | $ | — |  |  | $ | — |
Obligations of U.S. states, municipalities and political subdivisions |  | 27,185 |  |  | — |  |  | 27,185 |  |  | — |
Debt securities issued by foreign governments |  | 909 |  |  | — |  |  | 909 |  |  | — |
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities |  | 12,605 |  |  | — |  |  | 12,602 |  |  | 3 |
Corporate and all other bonds |  | 37,397 |  |  | — |  |  | 37,151 |  |  | 246 |
Total fixed maturities |  | 83,666 |  |  | 5,570 |  |  | 77,847 |  |  | 249 |
Equity securities |  |  |  |  |  |  |  |
Common stock |  | 639 |  |  | 631 |  |  | — |  |  | 8 |
Non-redeemable preferred stock |  | 48 |  |  | 16 |  |  | 3 |  |  | 29 |
Total equity securities |  | 687 |  |  | 647 |  |  | 3 |  |  | 37 |
Other investments |  | 20 |  |  | 20 |  |  | — |  |  | — |
Total |  | $ | 84,373 |  |  | $ | 6,237 |  |  | $ | 77,850 |  |  | $ | 286 |
Carrying value and fair value of the Company's financial assets and financial liabilities disclosed, but not carried, at fair value, and the level within the fair value hierarchy at which such assets and liabilities are categorized [Table Text Block] | The following tables present the carrying value and fair value of the Company’s financial assets and financial liabilities disclosed, but not carried, at fair value, and the level within the fair value hierarchy at which such assets and liabilities are categorized.
(as of September 30, 2025, in millions) |  | Carrying Value |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Financial assets |  |  |  |  |  |  |  |  |  |
Short-term securities |  | $ | 6,798 |  |  | $ | 6,798 |  |  | $ | 1,139 |  |  | $ | 5,612 |  |  | $ | 47 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 9,167 |  |  | $ | 8,597 |  |  | $ | — |  |  | $ | 8,597 |  |  | $ | — |
Commercial paper |  | 100 |  |  | 100 |  |  | — |  |  | 100 |  |  | — |
(as of December 31, 2024, in millions) |  | Carrying Value |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Financial assets |  |  |  |  |  |  |  |  |  |
Short-term securities |  | $ | 4,766 |  |  | $ | 4,766 |  |  | $ | 1,933 |  |  | $ | 2,788 |  |  | $ | 45 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
Debt |  | $ | 7,933 |  |  | $ | 7,095 |  |  | $ | — |  |  | $ | 7,095 |  |  | $ | — |
Commercial paper |  | 100 |  |  | 100 |  |  | — |  |  | 100 |  |  | — |

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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/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + 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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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