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Investment Securities (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Schedule of Available for Sale Securities by Type |  |
Cost | $ 3,231 | $ 3,144
Gross Unrealized Gains | 28 | 35
Gross Unrealized Losses | (9) | (22)
Estimated Fair Value | 3,250 | 3,157
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,412 | 2,019
Gross Unrealized Gains | 17 | 28
Gross Unrealized Losses | (2) | (11)
Estimated Fair Value | 1,427 | 2,036
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 12 | 12
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 12 | 12
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,115 | 465
Gross Unrealized Gains | 8 | 3
Gross Unrealized Losses | (5) | (8)
Estimated Fair Value | 1,118 | 460
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 28 | 19
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 28 | 19
Mortgage-backed securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 74 | 92
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 76 | 95
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1 | 1
Foreign government bonds and obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 539 | 486
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 0 | (1)
Estimated Fair Value | 540 | 486
Availabe For Sale Securities Other [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 50 | 50
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | $ 48 | $ 48

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