Line Of Business Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Line Of Business Information [Line Items]
Lines of business	2
Servicing fees	$ 4,382,000,000	$ 3,938,000,000	$ 3,334,000,000
Management fees	917,000,000	829,000,000	766,000,000
Trading services	1,220,000,000	1,106,000,000	1,094,000,000
Securities finance	378,000,000	318,000,000	570,000,000
Processing fees and other	297,000,000	349,000,000	171,000,000
Total fee revenue	7,194,000,000	6,540,000,000	5,935,000,000
Net interest revenue	2,333,000,000	2,699,000,000	2,564,000,000
Gains (Losses) related to investment securities, net	67,000,000	(286,000,000)	141,000,000
Total revenue	9,594,000,000	8,953,000,000	8,640,000,000
Provision for loan losses		25,000,000	149,000,000
Expenses from operations	6,789,000,000	6,183,000,000	5,667,000,000
Securities lending charge		414,000,000
Provision for fixed-income litigation exposure			250,000,000
Acquisition costs	16,000,000	89,000,000	49,000,000
Restructuring charges	253,000,000	156,000,000
Total expenses	7,058,000,000	6,842,000,000	5,966,000,000
Income from continuing operations before income taxes	2,536,000,000	2,086,000,000	2,525,000,000
Pre-tax margin	26.00%	23.00%	29.00%
Average assets	174,800,000,000	152,000,000,000	146,800,000,000
Percentage of affiliate owned	50.00%
Restructuring Accruals Other	133,000,000	156,000,000
Restructuring Reserve, Accrual Adjustment	120,000,000
Investment Servicing [Member]
Line Of Business Information [Line Items]
Servicing fees	4,382,000,000	3,938,000,000	3,334,000,000
Trading services	1,220,000,000	1,106,000,000	1,094,000,000
Securities finance	333,000,000	265,000,000	387,000,000
Processing fees and other	195,000,000	225,000,000	72,000,000
Total fee revenue	6,130,000,000	5,534,000,000	4,887,000,000
Net interest revenue	2,181,000,000	2,553,000,000	2,489,000,000
Gains (Losses) related to investment securities, net	67,000,000	58,000,000	141,000,000
Total revenue	8,378,000,000	8,145,000,000	7,517,000,000
Provision for loan losses		25,000,000	148,000,000
Expenses from operations	5,889,000,000	5,430,000,000	4,920,000,000
Securities lending charge		75,000,000
Total expenses	5,889,000,000	5,505,000,000	4,920,000,000
Income from continuing operations before income taxes	2,489,000,000	2,615,000,000	2,449,000,000
Pre-tax margin	30.00%	32.00%	33.00%
Average assets	169,400,000,000	146,900,000,000	143,700,000,000
Investment Management [Member]
Line Of Business Information [Line Items]
Management fees	917,000,000	829,000,000	766,000,000
Securities finance	45,000,000	53,000,000	183,000,000
Processing fees and other	102,000,000	124,000,000	99,000,000
Total fee revenue	1,064,000,000	1,006,000,000	1,048,000,000
Net interest revenue	152,000,000	146,000,000	68,000,000
Total revenue	1,216,000,000	1,152,000,000	1,116,000,000
Provision for loan losses			1,000,000
Expenses from operations	900,000,000	753,000,000	747,000,000
Securities lending charge		339,000,000
Provision for fixed-income litigation exposure			250,000,000
Total expenses	900,000,000	1,092,000,000	997,000,000
Income from continuing operations before income taxes	316,000,000	60,000,000	118,000,000
Pre-tax margin	26.00%	5.00%	11.00%
Average assets	5,400,000,000	5,100,000,000	3,100,000,000
Other [Member]
Line Of Business Information [Line Items]
Net interest revenue			7,000,000
Gains (Losses) related to investment securities, net		(344,000,000)
Total revenue		(344,000,000)	7,000,000
Acquisition costs	16,000,000	89,000,000	49,000,000
Restructuring charges	253,000,000	156,000,000
Total expenses	269,000,000	245,000,000	49,000,000
Income from continuing operations before income taxes	$ (269,000,000)	$ (589,000,000)	$ (42,000,000)