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v3.20.1

Investment Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | $ 4,838 |  |
Available-for-sale debt securities, Estimated Fair Value | 4,957 |  |
Equity securities |  |  |
Equity securities, Cost | 55 | $ 55 |
Equity securities, Gross Unrealized Gains | 22 | 25 |
Equity securities, Gross Unrealized Losses | (2) | (2) |
Equity securities, Estimated Fair Value | 75 | 78 |
Total Cost | 4,893 | 8,339 |
Total Gross Unrealized Gains | 141 | 71 |
Total Gross Unrealized Losses | (2) | (4) |
Total Estimated Fair Value | 5,032 | 8,406 |
Transferred Equity Investment [Member] |  |  |
Equity securities |  |  |
Equity securities, Gross Unrealized Gains |  |  | $ 9
State and municipal obligations [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 194 | 236 |
Available-for-sale debt securities, Gross Unrealized Gains | 10 | 8 |
Available-for-sale debt securities, Gross Unrealized Losses | 0 | (1) |
Available-for-sale debt securities, Estimated Fair Value | 204 | 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 | 4,001 | 7,395 |
Available-for-sale debt securities, Gross Unrealized Gains | 104 | 35 |
Available-for-sale debt securities, Gross Unrealized Losses | 0 | (1) |
Available-for-sale debt securities, Estimated Fair Value | 4,105 | 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 | 37 | 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 | 40 | 41 |
Foreign government bonds and obligations [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 574 | 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 | 576 | 579 |
Other Assets [Member] |  |  |
Equity securities |  |  |
Equity securities, Cost |  | 3 |
Equity securities, Estimated Fair Value | $ 25 | $ 28 |

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