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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Nonrecurring [Member]
Mar. 31, 2013
Nonrecurring [Member]
Mar. 31, 2014
Nonrecurring [Member]
Level 2 [Member]
Mar. 31, 2013
Nonrecurring [Member]
Level 2 [Member]
Mar. 31, 2014
Nonrecurring [Member]
Level 3 [Member]
Mar. 31, 2013
Nonrecurring [Member]
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis                
Loans held-for-sale $ 6,172 $ 6,656     $ 4,325 $ 3,902 $ 104 $ 795
Loans and leases         17 20 1,733 3,619
Foreclosed properties         4 [1] 48 [1] 1,179 [1] 1,981 [1]
Other assets 19,181 18,055     77 65    12
Gains (Losses) on loans held-for-sale     (3) (96)        
Gains (Losses) on loans and leases     (330) (640)        
Gains (Losses) on Foreclosed Properties     (14) [1] (19) [1]        
Gains (Losses) on other assets        $ (6)        
[1] Amounts are included in other assets on the Consolidated Balance Sheet and represent fair value of, and related losses on, foreclosed properties that were written down subsequent to their initial classification as foreclosed properties.