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Investment Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available for Sale Securities by Type |  |  |
Cost | $ 3,144 | $ 3,668 | $ 4,280
Gross Unrealized Gains | 35 | 100 | 154
Gross Unrealized Losses | (22) | (9) | (3)
Estimated Fair Value | 3,157 | 3,759 | 4,431
State and municipal obligations [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 2,019 | 2,813 | 3,366
Gross Unrealized Gains | 28 | 85 | 129
Gross Unrealized Losses | (11) | (5) | (2)
Estimated Fair Value | 2,036 | 2,893 | 3,493
U.S. Government agency obligations [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 12 | 2 | 3
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | 0 | 0 | 0
Estimated Fair Value | 12 | 2 | 3
U.S. Government treasury obligations [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 465 | 406 | 346
Gross Unrealized Gains | 3 | 4 | 4
Gross Unrealized Losses | (8) | (1) | 0
Estimated Fair Value | 460 | 409 | 350
Corporate debt securities [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 19 | 29 | 37
Gross Unrealized Gains | 0 | 1 | 3
Gross Unrealized Losses | 0 | 0 | 0
Estimated Fair Value | 19 | 30 | 40
Mortgage-backed securities [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 92 | 117 | 128
Gross Unrealized Gains | 3 | 4 | 8
Gross Unrealized Losses | 0 | 0 | 0
Estimated Fair Value | 95 | 121 | 136
Equity securities [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 1 | 1 | 0
Gross Unrealized Gains | 0 | 0 | 1
Gross Unrealized Losses | 0 | 0 | 0
Estimated Fair Value | 1 | 1 | 1
Foreign government bonds and obligations [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 486 | 250 | 350
Gross Unrealized Gains | 1 | 6 | 9
Gross Unrealized Losses | (1) | (1) | 0
Estimated Fair Value | 486 | 255 | 359
Other [Member] |  |  |
Schedule of Available for Sale Securities by Type |  |  |
Cost | 50 | 50 | 50
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | (2) | (2) | (1)
Estimated Fair Value | $ 48 | $ 48 | $ 49

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