|
Fair Value, Assets Recorded at Fair Value on a Nonrecurring Basis Level 3 Valuation Techniques and Significant Unobservable Inputs (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2012
Minimum [Member]
Mortgages held for sale [Member]
Discounted cash flow [Member]
|
Dec. 31, 2012
Minimum [Member]
Residential Portfolio Segment [Member]
Mortgages held for sale [Member]
Discounted cash flow [Member]
|
Dec. 31, 2012
Maximum [Member]
Mortgages held for sale [Member]
Discounted cash flow [Member]
|
Dec. 31, 2012
Maximum [Member]
Residential Portfolio Segment [Member]
Mortgages held for sale [Member]
Discounted cash flow [Member]
|
Dec. 31, 2012
Weighted Average [Member]
Mortgages held for sale [Member]
Discounted cash flow [Member]
|
Dec. 31, 2012
Weighted Average [Member]
Residential Portfolio Segment [Member]
Mortgages held for sale [Member]
Discounted cash flow [Member]
|
Dec. 31, 2012
Nonrecurring [Member]
|
Dec. 31, 2011
Nonrecurring [Member]
|
Dec. 31, 2012
Level 3 [Member]
Nonrecurring [Member]
|
Dec. 31, 2011
Level 3 [Member]
Nonrecurring [Member]
|
Dec. 31, 2012
Level 3 [Member]
Nonrecurring [Member]
Residential Portfolio Segment [Member]
Discounted cash flow [Member]
|
|
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | |||||||||||||
| Mortgages held for sale | $ 42,305 | $ 44,791 | $ 2,554 | $ 2,185 | $ 1,045 | $ 1,166 | $ 1,045 | ||||||
| Total insignificant level 3 assets | 148 | ||||||||||||
| Total | $ 1,193 | ||||||||||||
| Fair Value Inputs [Abstract] | |||||||||||||
| Discount rate | 3.40% | 4.10% | 7.50% | 11.90% | 5.40% | 10.90% | |||||||
| Loss severity | 1.30% | 2.00% | 35.30% | 45.00% | 26.40% | 6.00% | |||||||
| Default rate | 0.60% | 2.90% | 14.80% | 21.20% | 5.50% | 7.90% | |||||||
| Prepayment rate | 1.00% | 1.00% | 11.00% | 100.00% | 6.20% | 66.70% | |||||||