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Investment Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Schedule of Available for Sale Securities by Type |  |
Cost | $ 4,779 | $ 3,158
Gross Unrealized Gains | 11 | 16
Gross Unrealized Losses | (37) | (15)
Estimated Fair Value | 4,753 | 3,159
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,170 | 1,369
Gross Unrealized Gains | 7 | 11
Gross Unrealized Losses | (3) | (3)
Estimated Fair Value | 1,174 | 1,377
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 10 | 11
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 10 | 11
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 2,919 | 1,051
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | (28) | (9)
Estimated Fair Value | 2,893 | 1,045
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 32 | 28
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 32 | 28
Mortgage-backed securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 58 | 67
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 58 | 69
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 50 | 51
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (4) | (3)
Estimated Fair Value | 47 | 48
Foreign government bonds and obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 540 | 581
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | $ 539 | $ 581

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