Basis of Presentation (Details Textuals) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investments in Affordable Housing Projects [Abstract]
Loss from Affordable Housing Projects, Equity Method Investments	$ 11	$ 24	$ 20	$ 32
Affordable Housing Tax Credit And Other Tax Benefits, Amount	12	$ 9	24	$ 18
Qualified Affordable Housing Project, Investments	502		502		$ 522
Qualified Affordable Housing Project Investments, Commitment	$ 106		$ 106
Affordable Housing Tax Credits Commitment, Year to be Paid	between 2015 and 2023

Amount of affordable housing tax credits and other tax benefits recognized.

No definition available.

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Year in which contingent commitments to qualified affordable housing project investments are expected to be paid, in CCYY format

No definition available.

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Amount of investment income (loss) of qualified affordable housing project investments accounted for using the equity method.

No definition available.

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No definition available.

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Amount of investment in qualified affordable housing projects

No definition available.

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Amount of commitment or contingent commitments to qualified affordable housing project investments.

No definition available.

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Data Type:	xbrli:monetaryItemType
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