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Investment Securities (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | $ 8,319 |  |
Available-for-sale debt securities, Estimated Fair Value | 8,370 |  |
Equity securities |  |  |
Equity securities, Cost | 62 |  | $ 51
Equity securities, Gross Unrealized Gains | 15 | $ 29 | 0
Equity securities, Gross Unrealized Losses | (2) |  | (3)
Equity securities, Estimated Fair Value | 75 |  | 48
Total Cost | 8,381 |  | 4,659
Total Gross Unrealized Gains | 68 |  | 10
Total Gross Unrealized Losses | (4) |  | (22)
Total Estimated Fair Value | 8,445 |  | 4,647
State and municipal obligations [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 230 |  | 594
Available-for-sale debt securities, Gross Unrealized Gains | 10 |  | 4
Available-for-sale debt securities, Gross Unrealized Losses | 0 |  | (2)
Available-for-sale debt securities, Estimated Fair Value | 240 |  | 596
US Government agency obligations [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 10 |  | 10
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 | 10 |  | 10
U.S. Government treasury obligations [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 7,401 |  | 3,452
Available-for-sale debt securities, Gross Unrealized Gains | 40 |  | 5
Available-for-sale debt securities, Gross Unrealized Losses | (2) |  | (17)
Available-for-sale debt securities, Estimated Fair Value | 7,439 |  | 3,440
Corporate debt securities [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 27 |  | 28
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 | 27 |  | 28
Mortgage-backed securities [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 41 |  | 50
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 | 43 |  | 51
Foreign government bonds and obligations [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 610 |  | 474
Available-for-sale debt securities, Gross Unrealized Gains | 1 |  | 0
Available-for-sale debt securities, Gross Unrealized Losses | 0 |  | 0
Available-for-sale debt securities, Estimated Fair Value | 611 |  | $ 474
Other Assets [Member] |  |  |
Equity securities |  |  |
Equity securities, Cost | 10 |  |
Equity securities, Estimated Fair Value | $ 25 |  |

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