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Fair Values of Assets and Liabilities - Differences Between Aggregate Fair Value, Carrying Amount of MLHFS and Aggregate Unpaid Principal Amount (Details) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Abstract]    
Fair value carrying amount, total loans $ 7,562 $ 7,957
Fair value carrying amount, nonaccrual loans 9 8
Fair value carrying amount, loans 90 days or more past due 2 2
Aggregate unpaid principal, total loans 7,282 7,588
Aggregate unpaid principal, nonaccrual loans 14 13
Aggregate unpaid principal, loans 90 days or more past due 3 3
Carrying amount over (under) unpaid principal, total loans 280 369
Carrying amount over (under) unpaid principal, nonaccrual loans (5) (5)
Carrying amount over (under) unpaid principal, loans 90 days or more past due $ (1) $ (1)