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Consolidated Statement of Cash Flows (Unaudited) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income (loss) before noncontrolling interests $ 10,828 $ 9,041
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for credit losses 1,871 3,795
Changes in fair value of MSRs, MHFS and LHFS carried at fair value (2,269) (1,196)
Depreciation and amortization 1,643 1,384
Other net gains (6,404) 244
Stock-based compensation 1,139 1,039
Excess tax benefits related to stock incentive compensation (158) (125)
Originations of MHFS (203,840) (247,940)
Proceeds from sales of and principal collected on mortgages originated for sale 191,426 203,482
Originations of LHFS 0 (10)
Proceeds from sales of and principal collected on LHFS 242 5,786
Purchases of LHFS (187) (2,578)
Net change in:    
Trading assets 27,924 64,952
Deferred income taxes 2,170 568
Accrued interest receivable (186) 40
Accrued interest payable 198 74
Other assets, net (1,156) 1,858
Other accrued expenses and liabilities, net (1,126) (5,033)
Net cash provided by operating activities 22,115 35,381
Cash flows from investing activities:    
Net change in Federal funds sold, securities purchased under resale agreements and other short term investments (13,047) (30,268)
Securities available for sale:    
Sales proceeds 2,166 8,283
Prepayments and maturities 27,721 30,599
Purchases (52,238) (38,653)
Nonmarketable equity investments:    
Sales proceeds 1,133 863
Purchases (998) (958)
Loans:    
Loans originated by banking subsidiaries, net of principal collected (13,922) (14,426)
Proceeds from sales (including participations) of loans originated for investment 4,692 3,612
Purchases (including participations) of loans (3,729) (7,584)
Principal collected on nonbank entities' loans 12,012 12,088
Loans originated by nonbank entities (10,410) (11,016)
Net cash paid for acquisitions 0 (4,075)
Proceeds from sales of foreclosed assets 4,005 4,987
Changes in MSRs from purchases and sales 530 201
Other, net 1,109 (1,372)
Net cash used by investing activities (40,976) (47,719)
Cash flows from financing activities:    
Net change in deposits 18,750 8,860
Net change in short-term borrowings (203) 6,547
Long-term debt:    
Proceeds from issuance 15,712 17,133
Repayment (16,076) (19,121)
Preferred stock:    
Proceeds from issuance 610 0
Cash dividends paid (486) (439)
Common stock:    
Proceeds from issuance 1,337 1,311
Repurchased (1,838) (2,101)
Cash dividends paid (2,850) (2,336)
Excess tax benefits related to stock incentive compensation 158 125
Net change in noncontrolling interests (174) (270)
Net cash provided by financing activities 14,940 9,709
Net change in cash and due from banks (3,921) (2,629)
Cash and due from banks at beginning of period 21,860 19,440
Cash and due from banks at end of period 17,939 16,811
Supplemental cash flow disclosures:    
Cash paid for interest 2,030 2,610
Cash paid for income taxes $ 4,883 $ 2,850