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
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Level 2
Dec. 31, 2012
Level 2
Mar. 31, 2013
Level 3
Dec. 31, 2012
Level 3
Dec. 31, 2012
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Loans, notes and mortgages $ 144   $ 0 $ 1 $ 144 $ 221 $ 222
Gains (Losses) on loans, notes and mortgages (82) 12          
Other assets 2   0 0 2 2 2
Gains (Losses) on other assets $ 0 $ 0