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Investment Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Schedule of Available for Sale Securities by Type |  |
Cost | $ 4,465 | $ 4,280
Gross Unrealized Gains | 123 | 154
Gross Unrealized Losses | (4) | (3)
Estimated Fair Value | 4,584 | 4,431
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 3,076 | 3,366
Gross Unrealized Gains | 101 | 129
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 3,175 | 3,493
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 2 | 3
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2 | 3
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 345 | 346
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 351 | 350
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 37 | 37
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 39 | 40
Mortgage-backed securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 115 | 128
Gross Unrealized Gains | 5 | 8
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 120 | 136
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 0 | 0
Gross Unrealized Gains | 1 | 1
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 | 840 | 350
Gross Unrealized Gains | 8 | 9
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 848 | 359
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) | (1)
Estimated Fair Value | $ 48 | $ 49

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