Parent Company Financial Statements (Parent Company Statement Of Condition) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009	Dec. 31, 2008
Assets
Interest-bearing deposits with consolidated banking subsidiary	$ 58,886	$ 22,234
Trading account assets	707	479
Investment securities available for sale	99,832	81,881
Other assets	17,139	13,841	564,000
Total assets	216,827	160,505
Commercial paper	2,380	2,800
Long-term debt	8,131	8,550
Total liabilities	197,429	142,718
Total shareholders' equity	19,398	17,787		14,491	12,774
Total liabilities and shareholders' equity	216,827	160,505
Parent Company [Member]
Assets
Interest-bearing deposits with consolidated banking subsidiary	4,914	5,058
Trading account assets	138	122
Investment securities available for sale	25	24
Investments in subsidiaries, Consolidated banking subsidiary	18,724	16,697
Investments in subsidiaries, Consolidated non-banking subsidiaries	2,340	2,299
Investments in subsidiaries, Unconsolidated entities	326	297
Notes and other receivables, Consolidated banking subsidiary	618
Notes and other receivables, Consolidated non-banking subsidiaries and unconsolidated entities	302	283
Other assets	994	850
Total assets	28,381	25,630
Commercial paper	2,384	2,799
Accrued taxes, expenses and other liabilities due to Consolidated banking subsidiary		561
Accrued taxes, expenses and other liabilities due to Third parties	276	161
Long-term debt	6,323	4,322
Total liabilities	8,983	7,843
Total shareholders' equity	19,398	17,787
Total liabilities and shareholders' equity	$ 28,381	$ 25,630