Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value (Details)

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Fair Value Measurements - Nonrecurring Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis                    
Loans held-for-sale $ 10,878 $ 11,659         $ 2,195 $ 683 $ 660 $ 1,139
Gains (Losses) on loans held-for-sale     (61) (69) (69) (12)        
Loans and leases             14 [1] 27 [1] 4,489 [1] 6,902 [1]
Gains (Losses) on loans and leases     (525) [1] (1,213) [1] (1,004) [1] (2,350) [1]        
Foreclosed properties             12 [2] 67 [2] 1,435 [2] 1,305 [2]
Gains (Losses) on Foreclosed Properties     8 [2] (46) [2] 10 [2] (82) [2]        
Other assets 21,746 26,490         99 39 12 11
Gains (Losses) on other assets     $ (5) $ (2) $ (11) $ (2)        
[1] Losses represent charge-offs on real estate-secured loans
[2] Amounts are included in other assets on the Consolidated Balance Sheet and represent fair value and related losses on foreclosed properties that were written down subsequent to their initial classification as foreclosed properties.