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Fair Value Measurements - Fair Value of Assets And Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | $ 8,450 | $ 9,362
Equity securities, estimated fair value | 392 | 657
Servicing related assets | 21 | 27
Total assets | 8,863 | 10,046
Servicing related liabilities | 12 | 9
U.S. Treasury bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 147 | 123
Municipal bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,462 | 1,649
Foreign government bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 200 | 227
Governmental agency bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 129 | 177
Governmental agency mortgage-backed securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 5,050 | 5,607
U.S. corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,003 | 1,081
Foreign corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 459 | 498
Preferred Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 14 | 17
Common Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 378 | 640
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Equity securities, estimated fair value | 392 | 657
Servicing related assets | 0 | 0
Total assets | 392 | 657
Servicing related liabilities | 0 | 0
Level 1 | U.S. Treasury bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | Municipal bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | Foreign government bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | Governmental agency bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | Governmental agency mortgage-backed securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | U.S. corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | Foreign corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 1 | Preferred Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 14 | 17
Level 1 | Common Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 378 | 640
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 8,450 | 9,362
Equity securities, estimated fair value | 0 | 0
Servicing related assets | 1 | 11
Total assets | 8,451 | 9,373
Servicing related liabilities | 0 | 0
Level 2 | U.S. Treasury bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 147 | 123
Level 2 | Municipal bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,462 | 1,649
Level 2 | Foreign government bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 200 | 227
Level 2 | Governmental agency bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 129 | 177
Level 2 | Governmental agency mortgage-backed securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 5,050 | 5,607
Level 2 | U.S. corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 1,003 | 1,081
Level 2 | Foreign corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 459 | 498
Level 2 | Preferred Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 0 | 0
Level 2 | Common Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 0 | 0
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Equity securities, estimated fair value | 0 | 0
Servicing related assets | 20 | 16
Total assets | 20 | 16
Servicing related liabilities | 12 | 9
Level 3 | U.S. Treasury bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | Municipal bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | Foreign government bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | Governmental agency bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | Governmental agency mortgage-backed securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | U.S. corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | Foreign corporate debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Debt securities, estimated fair value | 0 | 0
Level 3 | Preferred Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | 0 | 0
Level 3 | Common Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract] |  |
Equity securities, estimated fair value | $ 0 | $ 0

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