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Investment Securities (Details 2) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) securities | Dec. 31, 2014 USD ($) securities
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | securities | 20 | 0
Number of securities, 12 months or more | securities | 11 | 15
Number of securities, total | securities | 31 | 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 87 | $ 0
Estimated Fair Value, 12 months or more | 73 | 105
Estimated Fair Value, Total | 160 | 105
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | 1 | 0
Gross Unrealized Losses, 12 months or more | 3 | 3
Gross Unrealized Losses, Total | $ 4 | $ 3
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract] |  |
Number of securities, less than 12 months | securities | 20 | 0
Number of securities, 12 months or more | securities | 11 | 15
Number of securities, total | securities | 31 | 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 87 | $ 0
Estimated Fair Value, 12 months or more | 73 | 105
Estimated Fair Value, Total | 160 | 105
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | 1 | 0
Gross Unrealized Losses, 12 months or more | 3 | 3
Gross Unrealized Losses, Total | $ 4 | $ 3

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