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Investment Securities (Details 1) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 224
Estimated Fair Value, 12 months or more | 475 | 873
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 Months | 0 | (2)
Gross Unrealized Losses, 12 months or more | (2) | (16)
State and municipal obligations [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or more | 0 | 82
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 Months | 0 | 0
Gross Unrealized Losses, 12 months or more | 0 | (1)
U.S. Government treasury obligations [Member] |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 224
Estimated Fair Value, 12 months or more | 475 | 791
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 Months | 0 | (2)
Gross Unrealized Losses, 12 months or more | $ (2) | $ (15)

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