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Investment Securities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | $ 21,465 |
Available-for-sale debt securities, Estimated Fair Value | 21,550 | $ 8,328
Equity securities |  |
Equity securities, Cost | 56 | 55
Equity securities, Unrealized Gains | 27 | 25
Equity securities, Unrealized Losses | (2) | (2)
Equity securities | 81 | 78
Total Cost | 21,521 | 8,339
Total Unrealized Gains | 112 | 71
Total Unrealized Losses | (2) | (4)
Total Estimated Fair Value | 21,631 | 8,406
State and municipal obligations [Member] |  |
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | 172 | 236
Available-for-sale debt securities, Unrealized Gains | 7 | 8
Available-for-sale debt securities, Unrealized Losses | 0 | (1)
Available-for-sale debt securities, Estimated Fair Value | 179 | 243
US Government agencies obligations [Member] |  |
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | 7 | 9
Available-for-sale debt securities, Unrealized Gains | 0 | 0
Available-for-sale debt securities, Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | 7 | 9
US government treasury obligations [Member] |  |
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | 20,655 | 7,395
Available-for-sale debt securities, Unrealized Gains | 76 | 35
Available-for-sale debt securities, Unrealized Losses | 0 | (1)
Available-for-sale debt securities, Estimated Fair Value | 20,731 | 7,429
Corporate debt securities [Member] |  |
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | 22 | 27
Available-for-sale debt securities, Unrealized Gains | 0 | 0
Available-for-sale debt securities, Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | 22 | 27
Mortgage-backed securities [Member] |  |
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | 28 | 39
Available-for-sale debt securities, Unrealized Gains | 2 | 2
Available-for-sale debt securities, Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | 30 | 41
Foreign government bonds and obligations [Member] |  |
Available-for-sale debt securities |  |
Available-for-sale debt securities, Cost | 581 | 578
Available-for-sale debt securities, Unrealized Gains | 0 | 1
Available-for-sale debt securities, Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | $ 581 | $ 579

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