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Investment Securities (Details 3) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | $ 19,703 |
Estimated Fair Value, Due after 1 year but within 5 years | 1,654 |
Estimated Fair Value, Due after 5 years but within 10 years | 62 |
Estimated Fair Value, Due after 10 years | 131 |
Total | 21,550 | $ 8,328
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Due within 1 year | 19,685 |
Due after 1 year but within 5 years | 1,598 |
Due after 5 years but within 10 years | 55 |
Due after 10 years | 127 |
Available-for-sale debt securities, Cost | $ 21,465 |
Weighted average yields |  |
Weighted average yields, due within 1 year | 0.31% |
Weighted averge yields, due after 1 years but within 5 years | 1.87% |
Weighted averge yields, due after 5 years but within 10 years | 5.53% |
Weighted average yield, due after 10 years | 4.06% |
Weighted average yields, Total | 0.46% |
State and municipal obligations [Member] |  |
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | $ 15 |
Estimated Fair Value, Due after 1 year but within 5 years | 21 |
Estimated Fair Value, Due after 5 years but within 10 years | 49 |
Estimated Fair Value, Due after 10 years | 94 |
Total | 179 | 243
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Available-for-sale debt securities, Cost | 172 | 236
US Government agencies obligations [Member] |  |
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | 0 |
Estimated Fair Value, Due after 1 year but within 5 years | 0 |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |
Estimated Fair Value, Due after 10 years | 7 |
Total | 7 | 9
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Available-for-sale debt securities, Cost | 7 | 9
US government treasury obligations [Member] |  |
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | 19,097 |
Estimated Fair Value, Due after 1 year but within 5 years | 1,621 |
Estimated Fair Value, Due after 5 years but within 10 years | 13 |
Estimated Fair Value, Due after 10 years | 0 |
Total | 20,731 | 7,429
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Available-for-sale debt securities, Cost | 20,655 | 7,395
Corporate debt securities [Member] |  |
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | 11 |
Estimated Fair Value, Due after 1 year but within 5 years | 11 |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |
Estimated Fair Value, Due after 10 years | 0 |
Total | 22 | 27
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Available-for-sale debt securities, Cost | 22 | 27
Mortgage-backed securities [Member] |  |
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | 0 |
Estimated Fair Value, Due after 1 year but within 5 years | 0 |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |
Estimated Fair Value, Due after 10 years | 30 |
Total | 30 | 41
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Available-for-sale debt securities, Cost | 28 | 39
Foreign government bonds and obligations [Member] |  |
Estimated Fair Value |  |
Estimated Fair Value, Due within 1 year | 580 |
Estimated Fair Value, Due after 1 year but within 5 years | 1 |
Estimated Fair Value, Due after 5 years but within 10 years | 0 |
Estimated Fair Value, Due after 10 years | 0 |
Total | 581 | 579
Available For Sale Securities Debt Maturities Amortized Cost [Abstract] |  |
Available-for-sale debt securities, Cost | $ 581 | $ 578

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