Fair Value Measurements (Details 4) (Mortgage servicing rights, USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Mortgage servicing rights
Estimated change in fair value from adverse changes in significant assumptions
Impact on fair value of 10% adverse change, Weighted-Average Prepayment Speed	$ (55)
Impact on fair value of 20% adverse change, Weighted-Average Prepayment Speed	(106)
Impact on fair value of 10% adverse change, Option Adjusted Spread	(58)
Impact on fair value of 20% adverse change, Option Adjusted Spread	(110)
Impact on fair value of 10% adverse change, Weighted Average Delinquency Rate	(23)
Impact on fair value of 20% adverse change, Weighted Average Delinquency Rate	$ (47)

The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References+ Details

- Definition

The hypothetical financial impact of a 20 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References+ Details

- Definition

The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References+ Details