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Fair Values of Assets and Liabilities (Details 5) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Aggregate unpaid principal balance of MLHFS    
Total Loans $ 3,300  
Carrying Amount [Member]
   
Aggregate unpaid principal balance of MLHFS    
Total Loans 3,304 8,100
Nonaccrual loans 9 11
Loans 90 days or more past due 4 6
Aggregate Unpaid Principal [Member]
   
Aggregate unpaid principal balance of MLHFS    
Total Loans 3,187 8,034
Nonaccrual loans 15 18
Loans 90 days or more past due 4 6
Excess of Carrying Amount Over (Under) Unpaid Principal [Member]
   
Aggregate unpaid principal balance of MLHFS    
Total Loans 117 66
Nonaccrual loans (6) (7)
Loans 90 days or more past due $ 0 $ 0