XML 117 R65.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Difference between carrying amounts measured at fair value and aggregate unpaid principal amount    
Carrying amount, Total $ 1,751 $ 2,174
Mortgage loans held for sale
   
Difference between carrying amounts measured at fair value and aggregate unpaid principal amount    
Carrying amount, Total 1,751 2,174
Carrying amount, Loans 90 days or more past due and on non-accrual status 15 17
Aggregate unpaid principal balance, Total 1,775 2,126
Aggregate unpaid principal balance, Loans 90 days or more past due and on non-accrual status 23 25
Difference, Total (24) 48
Difference, Loans 90 days or more past due and on non-accrual status $ (8) $ (8)