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Investment Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Schedule of Available for Sale Securities by Type |  |
Cost | $ 3,745 | $ 3,668
Gross Unrealized Gains | 100 | 100
Gross Unrealized Losses | (6) | (9)
Estimated Fair Value | 3,839 | 3,759
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 2,695 | 2,813
Gross Unrealized Gains | 76 | 85
Gross Unrealized Losses | (4) | (5)
Estimated Fair Value | 2,767 | 2,893
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 2 | 2
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2 | 2
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 375 | 406
Gross Unrealized Gains | 10 | 4
Gross Unrealized Losses | 0 | (1)
Estimated Fair Value | 385 | 409
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 28 | 29
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 29 | 30
Mortgage-backed securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 117 | 117
Gross Unrealized Gains | 5 | 4
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 122 | 121
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 | 477 | 250
Gross Unrealized Gains | 7 | 6
Gross Unrealized Losses | 0 | (1)
Estimated Fair Value | 484 | 255
Availabe For Sale Securities Other [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 50 | 50
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | $ 49 | $ 48

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