Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details)

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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gains on sales of debt securities $ 382 $ 457 $ 759 $ 525
Net interest income 10,013 10,549 20,098 21,213
Trading Gain (Loss) 1,832 1,938 4,299 4,927
Personnel 8,306 8,531 18,055 18,422
Other income (loss) 407 (80) 818 (201)
Income tax expense 504 1,486 99 1,987
Net income 2,291 [1] 4,012 [1] 2,015 [2] 5,495 [2]
Debt Securities [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gains on sales of debt securities 382 457 759 525
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income     241 (43)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] | Debt Securities [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gains on sales of debt securities     759 525
Other income (loss)     11 13
Income (loss) before income taxes     748 512
Income tax expense     284 190
Net income     464 322
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) before income taxes     (335) (421)
Income tax expense     (126) (156)
Net income     (209) (265)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Contracts [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net interest income     (560) (547)
Other income (loss)     0 18
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Commodity Contract [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Trading Gain (Loss)     0 (1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Equity Contracts [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Personnel     225 109
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) before income taxes     (25) (146)
Income tax expense     (10) (45)
Net income     (15) (101)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Prior service cost and actuarial losses [Member] [Domain]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Personnel     (25) (146)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign currency [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (loss)     2 (32)
Income (loss) before income taxes     2 (32)
Income tax expense     1 (33)
Net income     $ 1 $ 1
[1] There were no material intersegment revenues.
[2] (1) There were no material intersegment revenues.