Fair Value Measurements (Details 4) (Fair Value, Measurements, Recurring [Member], USD $) In Millions	Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Estimated change in the fair value of MSRs from adverse changes in the significant assumptions
Impact on fair value of 10% adverse change, Weighted-Average Prepayment Speed	$ (79)
Impact on fair value of 20% adverse change, Weighted-Average Prepayment Speed	(152)
Impact on fair value of 10% adverse change, Option Adjusted Spread	(68)
Impact on fair value of 20% adverse change, Option Adjusted Spread	(130)
Impact on fair value of 10% adverse change, Volatility	(29)
Impact on fair value of 20% adverse change, Volatility	$ (60)

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.

+ References+ Details

The hypothetical financial impact of a 10 percent adverse change of the specified assumption 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 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 the specified assumption 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