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Fair Value Measurements - Fair Value of Assets And Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | 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 | $ 9,362 | $ 6,355
Equity securities, estimated fair value | 657 | 464
Servicing related assets | 27 |
Debt and Equity securities, estimated fair value | 10,046 | 6,819
Servicing related liabilities | 9 |
Total liabilities | 9 |
U.S. Treasury bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 123 | 81
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,649 | 1,248
Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 227 | 199
Governmental agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 177 | 264
Governmental agency mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 5,607 | 3,474
U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,081 | 682
Foreign corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 498 | 407
Preferred Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities, estimated fair value | 17 | 19
Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities, estimated fair value | 640 | 445
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Equity securities, estimated fair value | 657 | 464
Servicing related assets | 0 |
Debt and Equity securities, estimated fair value | 657 | 464
Servicing related liabilities | 0 |
Total liabilities | 0 |
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 | 17 | 19
Level 1 | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities, estimated fair value | 640 | 445
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 9,362 | 6,355
Equity securities, estimated fair value | 0 | 0
Servicing related assets | 11 |
Debt and Equity securities, estimated fair value | 9,373 | 6,355
Servicing related liabilities | 0 |
Total liabilities | 0 |
Level 2 | U.S. Treasury bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 123 | 81
Level 2 | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,649 | 1,248
Level 2 | Foreign government bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 227 | 199
Level 2 | Governmental agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 177 | 264
Level 2 | Governmental agency mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 5,607 | 3,474
Level 2 | U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,081 | 682
Level 2 | Foreign corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Debt securities, estimated fair value | 498 | 407
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
Servicing related assets | 16 |
Debt and Equity securities, estimated fair value | 16 | 0
Servicing related liabilities | 9 |
Total liabilities | 9 |
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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