v2.4.0.6
Fair Value Measurements (Summary Of Net Gains (Losses) From Changes In Fair Value) (Detail) (Loans Held For Sale [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Loans Held For Sale [Member]
       
Fair Value, Option, Quantitative Disclosures [Line Items]        
Net gains resulting from changes in fair value $ 22 $ 5 $ 12 $ 23