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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Level 2
Dec. 31, 2012
Level 2
Jun. 30, 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 $ 133   $ 133   $ 1 $ 1 $ 132 $ 221 $ 222
Gains (Losses) on loans, notes and mortgages (1) (53) (2) (40)          
Other assets 2   2   0 0 2 2 2
Gains (Losses) on other assets 0 0 0 0          
Other payables - interest and other 0   0   0   0    
Gain Loss on Other Payables, Interest and Other $ 0 $ 4 $ 0 $ 3