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 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2012
Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2011
Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2012
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Sep. 30, 2011
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis                    
Loans held-for-sale $ 11,077 $ 7,630         $ 3,551 $ 9,284 $ 1,006 $ 1,465
Gains (Losses) on loans held-for-sale     1 (85) 6 (19)        
Loans and leases             16 [1] 6 [1] 8,576 [1] 10,368 [1]
Gains (Losses) on loans and leases     (1,548) [1] (1,445) [1] (3,422) [1] (4,153) [1]        
Foreclosed properties             64 [2]    [2] 1,436 [2] 2,556 [2]
Gains (Losses) on Foreclosed Properties     (23) [2] (87) [2] (179) [2] (233) [2]        
Other assets 32,552 37,084         32 20 111 861
Gains (Losses) on other assets     $ 9 $ (20) $ 11 $ (43)        
[1] Losses represent charge-offs on real estate-secured loans.
[2] Amounts are included in other assets on the Corporation's 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.