Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Level 2
Dec. 31, 2011
Level 2
Sep. 30, 2012
Level 3
Dec. 31, 2011
Level 3
Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Investment securities non-qualifying $ 4   $ 4   $ 0 $ 0 $ 4 $ 5 $ 5
Gains (Losses) on investment securities non-qualifying 0 0 0 (5)          
Loans, notes and mortgages 258   258   11 298 247 245 543
Gains (Losses) on loans, notes and mortgages (9) (43) (49) 1          
Other assets 99   99   2 0 97 19 19
Gains (Losses) on other assets (1) 0 (1) (7)          
Other payables - interest and other 0   0   0   0    
Gains (Losses) on other payables - interest and other $ 0 $ 0 $ 0 $ (1)