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Consolidated Statement of Cash Flows (Unaudited) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income (loss) before noncontrolling interests $ 5,220 $ 4,320
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for credit losses 1,219 1,995
Changes in fair value of MSRs, MHFS and LHFS carried at fair value (984) (1,007)
Depreciation and amortization 834 649
Other net gains (2,695) (1,663)
Stock-based compensation 625 539
Excess tax benefits related to stock incentive compensation (86) (98)
Originations of MHFS (99,777) (123,671)
Proceeds from sales of and principal collected on mortgages originated for sale 86,880 91,464
Originations of LHFS 0 (5)
Proceeds from sales of and principal collected on LHFS 92 2,893
Purchases of LHFS (75) (2,095)
Net change in:    
Trading assets 13,135 43,480
Deferred income taxes 235 87
Accrued interest receivable (288) (113)
Accrued interest payable 156 184
Other assets, net 3,110 5,561
Other accrued expenses and liabilities, net 1,536 (6,615)
Net cash provided by operating activities 9,137 15,905
Cash flows from investing activities:    
Net change in Federal funds sold, securities purchased under resale agreements and other short term investments (8,186) (29,776)
Securities available for sale:    
Sales proceeds 1,303 4,242
Prepayments and maturities 13,302 12,317
Purchases (32,098) (18,156)
Nonmarketable equity investments:    
Sales proceeds 283 390
Purchases (467) (524)
Loans:    
Loans originated by banking subsidiaries, net of principal collected (6,252) (3,103)
Proceeds from sales (including participations) of loans originated for investment 2,764 2,193
Purchases (including participations) of loans (1,105) (2,423)
Principal collected on nonbank entities' loans 5,828 2,003
Loans originated by nonbank entities (5,289) (1,620)
Net cash paid for acquisitions 0 (426)
Proceeds from sales of foreclosed assets 2,001 2,365
Changes in MSRs from purchases and sales 396 (14)
Other, net 1,363 (429)
Net cash used by investing activities (26,157) (32,961)
Cash flows from financing activities:    
Net change in deposits 7,898 10,194
Net change in short-term borrowings 3,507 1,488
Long-term debt:    
Proceeds from issuance 7,820 8,999
Repayment (7,134) (5,237)
Preferred stock:    
Proceeds from issuance 610 0
Cash dividends paid (306) (286)
Common stock:    
Proceeds from issuance 644 879
Repurchased (383) (64)
Cash dividends paid (1,284) (1,165)
Excess tax benefits related to stock incentive compensation 86 98
Net change in noncontrolling interests (81) (290)
Net cash provided by financing activities 11,377 14,616
Net change in cash and due from banks (5,643) (2,440)
Cash and due from banks at beginning of period 21,860 19,440
Cash and due from banks at end of period 16,217 17,000
Supplemental cash flow disclosures:    
Cash paid for interest 995 1,183
Cash paid for income taxes $ 377 $ 333