Annual report pursuant to Section 13 and 15(d)

Fair Value Disclosures - Nonrecurring Fair Value (Details)

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Fair Value Disclosures - Nonrecurring Fair Value (Details) (Fair Value, Measurements, Nonrecurring, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gains (Losses) on investment securities non-qualifying   $ (1) $ (32)
Loans, notes and mortgages 222    
Gains (Losses) on loans, notes and mortgages (80) (59) (19)
Other assets 2    
Gains (Losses) on other assets 1 (8) (26)
Gains (Losses) on other payables - Interest and other   0 8
Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities non-qualifying   0  
Loans, notes and mortgages 1 298  
Other assets 0 0  
Other payables — interest and other   0  
Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities non-qualifying   5  
Loans, notes and mortgages 221 245  
Other assets 2 19  
Other payables — interest and other   0  
Estimate of Fair Value, Fair Value Disclosure
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities non-qualifying   5  
Loans, notes and mortgages   543  
Other assets   19  
Other payables — interest and other   $ 0