Mortgage Loan Repurchase Losses (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Reserve for mortgage loan repurchase losses
Balance at beginning of period	$ 270	$ 210	$ 265	$ 200
Repurchase provision	90	148	170	276
Charge-offs	(61)	(102)	(136)	(220)
Balance at end of period	$ 299	$ 256	$ 299	$ 256