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Investment Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest available-for-sale debt securities | $ 24 | $ 20
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 19,757 |
Available-for-sale debt securities, Estimated Fair Value | 19,869 | 8,328
Equity securities |  |
Equity securities, Cost | 53 | 55
Equity securities, Gross Unrealized Gains | 22 | 25
Equity securities, Gross Unrealized Losses | (2) | (2)
Equity securities, Estimated Fair Value | 73 | 78
Total Cost | 19,810 | 8,339
Total Gross Unrealized Gains | 134 | 71
Total Gross Unrealized Losses | (2) | (4)
Total Estimated Fair Value | 19,942 | 8,406
State and municipal obligations [Member] |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 185 | 236
Available-for-sale debt securities, Gross Unrealized Gains | 7 | 8
Available-for-sale debt securities, Gross Unrealized Losses | 0 | (1)
Available-for-sale debt securities, Estimated Fair Value | 192 | 243
US Government agency obligations [Member] |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 8 | 9
Available-for-sale debt securities, Gross Unrealized Gains | 0 | 0
Available-for-sale debt securities, Gross Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | 8 | 9
U.S. Government treasury obligations [Member] |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 18,959 | 7,395
Available-for-sale debt securities, Gross Unrealized Gains | 100 | 35
Available-for-sale debt securities, Gross Unrealized Losses | 0 | (1)
Available-for-sale debt securities, Estimated Fair Value | 19,059 | 7,429
Corporate debt securities [Member] |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 24 | 27
Available-for-sale debt securities, Gross Unrealized Gains | 0 | 0
Available-for-sale debt securities, Gross Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | 24 | 27
Mortgage-backed securities [Member] |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 35 | 39
Available-for-sale debt securities, Gross Unrealized Gains | 3 | 2
Available-for-sale debt securities, Gross Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | 38 | 41
Foreign government bonds and obligations [Member] |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Cost | 546 | 578
Available-for-sale debt securities, Gross Unrealized Gains | 2 | 1
Available-for-sale debt securities, Gross Unrealized Losses | 0 | 0
Available-for-sale debt securities, Estimated Fair Value | $ 548 | $ 579

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