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, 2014
Dec. 31, 2013
Jun. 30, 2014
Nonrecurring [Member]
Jun. 30, 2013
Nonrecurring [Member]
Jun. 30, 2014
Nonrecurring [Member]
Jun. 30, 2013
Nonrecurring [Member]
Jun. 30, 2014
Nonrecurring [Member]
Level 2 [Member]
Jun. 30, 2013
Nonrecurring [Member]
Level 2 [Member]
Jun. 30, 2014
Nonrecurring [Member]
Level 3 [Member]
Jun. 30, 2013
Nonrecurring [Member]
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis                    
Loans held-for-sale $ 5,262 $ 6,656         $ 1,057 $ 2,195 $ 127 $ 660
Loans and leases             5 14 3,244 4,489
Foreclosed properties             6 [1] 12 [1] 1,156 [1] 1,435 [1]
Other assets 17,946 18,005         90 99 2 12
Gains (Losses) on loans held-for-sale     5 (61) 4 (69)        
Gains (Losses) on loans and leases     (318) (525) (564) (1,004)        
Gains (Losses) on Foreclosed Properties     (21) [1] (12) [1] (28) [1] (18) [1]        
Gains (Losses) on other assets     $ (16) $ (5) $ (16) $ (11)        
[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.