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Derivatives (Details 2) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Gains (losses) in the Consolidated Statement of Operations for derivative instruments        
Total $ 141 $ 181 $ 330 $ 322
Option Contracts [Member] | Gain on mortgage loans, net [Member]
       
Gains (losses) in the Consolidated Statement of Operations for derivative instruments        
Total (4) (12) (7) (12)
Interest rate contracts [Member] | Fleet Interest Expense [Member]
       
Gains (losses) in the Consolidated Statement of Operations for derivative instruments        
Total (1) (3) (1) (6)
Foreign Exchange Contract [Member] | Fleet Interest Expense [Member]
       
Gains (losses) in the Consolidated Statement of Operations for derivative instruments        
Total (3) 6 (5) 5
Interest rate lock commitments [Member] | Gain on mortgage loans, net [Member]
       
Gains (losses) in the Consolidated Statement of Operations for derivative instruments        
Total 249 379 433 581
Forward delivery commitments [Member] | Gain on mortgage loans, net [Member]
       
Gains (losses) in the Consolidated Statement of Operations for derivative instruments        
Total $ (100) $ (189) $ (90) $ (246)