Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Purchased Credit-Impaired Loans (Details)

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Outstanding Loans and Leases - Purchased Credit-Impaired Loans (Details) (Consumer Portfolio Segment [Member], Countrywide [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Consumer Portfolio Segment [Member] | Countrywide [Member]
   
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Accretable Yield, Beginning of Period $ 4,990 $ 5,481
Accretion (276) (1,285)
Disposals/Transfers (24) (118)
Reclassifications to Nonaccretable Difference 182 912
Accretable Yield, End of Period $ 4,872 $ 4,990