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Investment Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | $ 8,410 |  |
Available-for-sale debt securities, Estimated Fair Value | 8,457 |  |
Equity securities |  |  |
Equity securities, Cost | 61 |  | $ 51
Equity securities, Gross Unrealized Gains | 27 | $ 29 | 0
Equity securities, Gross Unrealized Losses | (3) |  | (3)
Equity securities, Estimated Fair Value | 85 |  | 48
Total Cost | 8,471 |  | 4,659
Total Gross Unrealized Gains | 77 |  | 10
Total Gross Unrealized Losses | (6) |  | (22)
Total Estimated Fair Value | 8,542 |  | 4,647
US States and Political Subdivisions Debt Securities [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 324 |  | 594
Available-for-sale debt securities, Gross Unrealized Gains | 9 |  | 4
Available-for-sale debt securities, Gross Unrealized Losses | 0 |  | (2)
Available-for-sale debt securities, Estimated Fair Value | 333 |  | 596
US Government Agencies Debt Securities [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
US Treasury Securities [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 7,383 |  | 3,452
Available-for-sale debt securities, Gross Unrealized Gains | 38 |  | 5
Available-for-sale debt securities, Gross Unrealized Losses | (3) |  | (17)
Available-for-sale debt securities, Estimated Fair Value | 7,418 |  | 3,440
Corporate Debt Securities [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 28 |  | 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 | 28 |  | 28
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 45 |  | 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 | 47 |  | 51
Debt Security, Government, Non-US [Member] |  |  |
Available-for-sale debt securities: |  |  |
Available-for-sale debt securities, Cost | 620 |  | 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 | 621 |  | $ 474
Other Assets [Member] |  |  |
Equity securities |  |  |
Equity securities, Cost | 10 |  |
Equity securities, Estimated Fair Value | $ 37 |  |

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