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Fair Value, Estimates for Financial Instruments Not Carried at Fair Value (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Financial assets:
Cash and due from banks	$ 17,000	$ 19,440	$ 16,978	$ 16,044
Federal funds sold, securities purchased under resale agreements and other short-term investments	74,143	44,367
Mortgages held for sale	43,449	48,357
Loans held for sale	958	1,338
Loans	766,521	769,631
Nonmarketable equity investments (cost method)	8,162	8,061
Financial liabilities:
Deposits	930,267	920,070
Short-term borrowings	50,964	49,091
Long-term debt	129,752	125,354
Carrying amount [Member]
Financial assets:
Cash and due from banks	17,000	19,440
Federal funds sold, securities purchased under resale agreements and other short-term investments	74,143	44,367
Mortgages held for sale	4,266	3,566
Loans held for sale	162	162
Loans	728,575	731,308
Nonmarketable equity investments (cost method)	8,162	8,061
Financial liabilities:
Deposits	930,267	920,070
Short-term borrowings	50,964	49,091
Long-term debt	129,649	125,238
Estimated fair value [Member]
Financial assets:
Cash and due from banks	17,000	19,440
Federal funds sold, securities purchased under resale agreements and other short-term investments	74,143	44,367
Mortgages held for sale	4,312	3,566
Loans held for sale	167	176
Loans	726,391	723,867
Nonmarketable equity investments (cost method)	8,600	8,490
Financial liabilities:
Deposits	931,738	921,803
Short-term borrowings	50,964	49,091
Long-term debt	132,353	126,484
Estimated fair value [Member] \| Level 1 [Member]
Financial assets:
Cash and due from banks	17,000
Federal funds sold, securities purchased under resale agreements and other short-term investments	0
Mortgages held for sale	0
Loans held for sale	0
Loans	0
Nonmarketable equity investments (cost method)	0
Financial liabilities:
Deposits	0
Short-term borrowings	0
Long-term debt	0
Estimated fair value [Member] \| Level 2 [Member]
Financial assets:
Cash and due from banks	0
Federal funds sold, securities purchased under resale agreements and other short-term investments	74,143
Mortgages held for sale	1,044
Loans held for sale	157
Loans	54,386
Nonmarketable equity investments (cost method)	4
Financial liabilities:
Deposits	856,769
Short-term borrowings	50,964
Long-term debt	0
Estimated fair value [Member] \| Level 3 [Member]
Financial assets:
Cash and due from banks	0
Federal funds sold, securities purchased under resale agreements and other short-term investments	0
Mortgages held for sale	3,268
Loans held for sale	10
Loans	672,005
Nonmarketable equity investments (cost method)	8,596
Financial liabilities:
Deposits	74,969
Short-term borrowings	0
Long-term debt	$ 132,353