Goodwill and Other Intangible Assets (Commercial and Residential Mortgage Loan Servicing Assets - Key Valuation Assumptions) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2012 yr	Dec. 31, 2011 yr	Jun. 30, 2011	Dec. 31, 2010
Commercial Mortgage Servicing Rights [Member]
Goodwill [Line Items]
Fair Value	$ 400	$ 471
Weighted-average life (years)	5.6	5.9
Weighted-average constant prepayment rate	6.34%	5.08%
Decline in fair value from 10% adverse change in prepayment rate	8	6
Decline in fair value from 20% adverse change in prepayment rate	15	11
Effective Discount Rate	7.92%	7.92%
Decline in fair value from 10% adverse change in interest rate	12	9
Decline in fair value from 20% adverse change in interest rate	23	18
Residential Mortgage Servicing Rights [Member]
Goodwill [Line Items]
Fair Value	581	647	996	1,033
Weighted-average life (years)	3.7	3.6
Weighted-average constant prepayment rate	21.35%	22.10%
Decline in fair value from 10% adverse change in prepayment rate	42	44
Decline in fair value from 20% adverse change in prepayment rate	79	84
Weighted Average Option Adjusted Spread	11.46%	11.77%
Decline in fair value from 10% adverse change in interest rate	22	25
Decline in fair value from 20% adverse change in interest rate	$ 43	$ 48

Mortgage Service Right Key Valuation Assumptions Effective Discount Rate

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- Definition

Mortgage Service Right Key Valuation Assumptions Weighted-average constant prepayment rate

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- Definition

The weighted-average option adjusted spread key valuation assumption used in the valuation process of RMSRs.

+ References

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- Definition

The weighted average life of securitized assets. This is used as a key input and assumption in measuring the fair value of assets or liabilities that relate to a transferor's continuing involvement, if any, as of the date of the latest statement of financial position presented.

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- Definition

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

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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.

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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.

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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

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- Definition

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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