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Fair Value Measurements - Fair Value of Assets Measured on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | $ 8,170 | $ 9,362 |
Equity securities, estimated fair value | 280 | 657 |
Mortgage loans held for sale | 16 | 12 |
Debt and Equity securities, estimated fair value | 8,466 | 10,031 |
U.S. Treasury bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 303 | 123 |
Municipal bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 1,479 | 1,649 |
Foreign government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 194 | 227 |
Governmental agency bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 229 | 177 |
Governmental agency mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 4,601 | 5,607 |
U.S. corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 921 | 1,081 |
Foreign corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 443 | 498 |
Preferred Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 11 | 17 |
Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 269 | 640 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Equity securities, estimated fair value | 280 | 657 |
Mortgage loans held for sale | 0 | 0 |
Debt and Equity securities, estimated fair value | 280 | 657 |
Level 1 | U.S. Treasury bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | Municipal bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | Foreign government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | Governmental agency bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | Governmental agency mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | U.S. corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | Foreign corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 1 | Preferred Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 11 | 17 |
Level 1 | Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 269 | 640 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 8,170 | 9,362 |
Equity securities, estimated fair value | 0 | 0 |
Mortgage loans held for sale | 14 | 11 |
Debt and Equity securities, estimated fair value | 8,184 | 9,373 |
Level 2 | U.S. Treasury bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 303 | 123 |
Level 2 | Municipal bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 1,479 | 1,649 |
Level 2 | Foreign government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 194 | 227 |
Level 2 | Governmental agency bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 229 | 177 |
Level 2 | Governmental agency mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 4,601 | 5,607 |
Level 2 | U.S. corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 921 | 1,081 |
Level 2 | Foreign corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 443 | 498 |
Level 2 | Preferred Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 0 | 0 |
Level 2 | Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 0 | 0 |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Equity securities, estimated fair value | 0 |  | $ 0
Mortgage loans held for sale | 2 | 1 |
Debt and Equity securities, estimated fair value | 2 |  | $ 1
Level 3 | U.S. Treasury bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | Municipal bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | Foreign government bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | Governmental agency bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | Governmental agency mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | U.S. corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | Foreign corporate debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Debt securities, estimated fair value | 0 | 0 |
Level 3 | Preferred Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | 0 | 0 |
Level 3 | Common Stock |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |  |
Equity securities, estimated fair value | $ 0 | $ 0 |

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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