Mortgage Servicing Rights Carried at Fair Value (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Changes in MSRs measured at fair value
Fair value, beginning of period			$ 14,467
Changes in fair value:
Due to changes in valuation model inputs or assumptions	(1,075)	(2,661)	(576)	(3,438)
Other changes in fair value	(535)	(575)	(1,115)	(1,194)
Total changes in fair value of MSRs measured at fair value	(1,610)	(3,236)	(1,691)	(4,632)
Fair value, end of period	14,778		14,778
Carried at Fair Value [Member]
Changes in MSRs measured at fair value
Fair value, beginning of period	15,648	15,544	14,467	16,004
Adjustments from adoption of consolidation accounting guidance	0	0	0	(118)
Servicing from securitizations or asset transfers	740	943	2,002	1,997
Net additions	740	943	2,002	1,879
Changes in fair value:
Due to changes in valuation model inputs or assumptions	(1,075)	(2,661)	(576)	(3,438)
Other changes in fair value	(535)	(575)	(1,115)	(1,194)
Total changes in fair value of MSRs measured at fair value	(1,610)	(3,236)	(1,691)	(4,632)
Fair value, end of period	$ 14,778	$ 13,251	$ 14,778	$ 13,251