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Investment Securities (Details 1) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 4,311 | $ 477
Estimated Fair Value, 12 months or more | 52 | 0
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | (83) | (1)
Gross Unrealized Losses, 12 months or more | (1) | 0
State and municipal obligations |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 52 | 0
Estimated Fair Value, 12 months or more | 0 | 0
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | (10) | 0
Gross Unrealized Losses, 12 months or more | 0 | 0
U.S. Government treasury obligations |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 3,710 | 477
Estimated Fair Value, 12 months or more | 52 | 0
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | (72) | (1)
Gross Unrealized Losses, 12 months or more | (1) | 0
Foreign government bonds and obligations |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 549 | 0
Estimated Fair Value, 12 months or more | 0 | 0
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | (1) | 0
Gross Unrealized Losses, 12 months or more | $ 0 | $ 0

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