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Investment Securities (Investment) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Investment [Line Items]     
Gross unrealized gains$ 0    
Gross unrealized loss0   0
Net pre-tax gains (loss) on trading securities(29)332652 
Marketable securities OTTI amounts8638270297 
Marketable securities OTTI recorded in AOCI18784131 
Other than Temporary Impairment Losses, Investments6831186166 
Incremental Charges On Previously Impaired Investment Securities23110437 
Other Than Temporary Impairment Related To Equity Securities6231624 
Other Than Temporary First Time Impairments Of Investment Securities Recognized In Earnings3725794 
Other Than Temporary Impairment Related To Securities Subsequently Sold114240 
Proceeds from Sale of Available-for-sale Securities3,4664,75413,43812,070 
Subsidiaries [Member] | Domestic Corporate Debt Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost1 1 1
Investment securities gross unrealized gains0 0 0
Investment securities gross unrealized loss0 0 0
Investment securities estimated fair value1 1 1
Subsidiaries GECS [Member] | Domestic Corporate Debt Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost21,633 21,633 21,233
Investment securities gross unrealized gains3,076 3,076 1,576
Investment securities gross unrealized loss(276) (276) (237)
Investment securities estimated fair value24,433 24,433 22,572
Domestic Corporate Debt Securities [Member]
     
Investment [Line Items]     
Cumulative impairments recognized in earnings associated with debt securities561428500340 
Subsidiaries GECS [Member] | US States and Political Subdivisions Debt Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost2,970 2,970 2,961
Investment securities gross unrealized gains317 317 45
Investment securities gross unrealized loss(144) (144) (282)
Investment securities estimated fair value3,143 3,143 2,724
Subsidiaries GECS [Member] | Residential Mortgage Backed Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost2,794 2,794 3,092
Investment securities gross unrealized gains191 191 95
Investment securities gross unrealized loss(303) (303) (378)
Investment securities estimated fair value2,682 2,682 2,809
Subsidiaries GECS [Member] | Commercial Mortgage Backed Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost2,887 2,887 3,009
Investment securities gross unrealized gains137 137 145
Investment securities gross unrealized loss(269) (269) (230)
Investment securities estimated fair value2,755 2,755 2,924
Subsidiaries GECS [Member] | Asset-backed Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost4,060 4,060 3,407
Investment securities gross unrealized gains10 10 16
Investment securities gross unrealized loss(216) (216) (193)
Investment securities estimated fair value3,854 3,854 3,230
Subsidiaries GECS [Member] | Foreign Corporate Debt Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost2,703 2,703 2,883
Investment securities gross unrealized gains135 135 116
Investment securities gross unrealized loss(142) (142) (132)
Investment securities estimated fair value2,696 2,696 2,867
Subsidiaries GECS [Member] | Foreign Government Debt Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost2,282 2,282 2,242
Investment securities gross unrealized gains116 116 82
Investment securities gross unrealized loss(133) (133) (58)
Investment securities estimated fair value2,265 2,265 2,266
Subsidiaries GECS [Member] | US Treasury and Government [Member]
     
Investment [Line Items]     
Investment securities amortized cost3,220 3,220 3,358
Investment securities gross unrealized gains91 91 57
Investment securities gross unrealized loss0 0 (47)
Investment securities estimated fair value3,311 3,311 3,368
Subsidiaries GECS [Member] | Retained Interest [Member]
     
Investment [Line Items]     
Investment securities amortized cost29 29 55
Investment securities gross unrealized gains14 14 10
Investment securities gross unrealized loss(6) (6) (26)
Investment securities estimated fair value37 37 39
Subsidiaries [Member] | Available-for-sale Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost17 17 18
Investment securities gross unrealized gains0 0 0
Investment securities gross unrealized loss0 0 0
Investment securities estimated fair value17 17 18
Subsidiaries GECS [Member] | Available-for-sale Securities [Member]
     
Investment [Line Items]     
Investment securities amortized cost828 828 500
Investment securities gross unrealized gains134 134 213
Investment securities gross unrealized loss(83) (83) (8)
Investment securities estimated fair value879 879 705
Subsidiaries GECS [Member] | Trading Securities [Member] | Amortized Cost [Member]
     
Investment [Line Items]     
Trading Securities387 387 417
Subsidiaries GECS [Member] | Trading Securities [Member] | Estimated Fair Value [Member]
     
Investment [Line Items]     
Trading Securities, Fair Value Disclosure387 387 417
Subsidiaries GECS [Member] | Consolidation, Eliminations [Member]
     
Investment [Line Items]     
Investment securities gross unrealized gains0 0 0
Investment securities gross unrealized loss0 0 0
Subsidiaries GECS [Member] | Consolidation, Eliminations [Member] | Amortized Cost [Member]
     
Investment [Line Items]     
Marketable Securities(2) (2) (2)
Subsidiaries GECS [Member] | Consolidation, Eliminations [Member] | Estimated Fair Value [Member]
     
Investment [Line Items]     
Marketable Securities(2) (2) (2)
Subsidiaries GECS [Member] | Sub Total [Member]
     
Investment [Line Items]     
Investment securities gross unrealized gains4,221 4,221 2,355
Investment securities gross unrealized loss(1,572) (1,572) (1,591)
Subsidiaries GECS [Member] | Sub Total [Member] | Amortized Cost [Member]
     
Investment [Line Items]     
Marketable Securities43,793 43,793 43,157
Subsidiaries GECS [Member] | Sub Total [Member] | Estimated Fair Value [Member]
     
Investment [Line Items]     
Marketable Securities46,442 46,442 43,921
Subsidiaries GECS [Member] | Total [Member]
     
Investment [Line Items]     
Investment securities gross unrealized gains4,221 4,221 2,355
Investment securities gross unrealized loss(1,572) (1,572) (1,591)
Subsidiaries GECS [Member] | Total [Member] | Amortized Cost [Member]
     
Investment [Line Items]     
Marketable Securities43,809 43,809 43,174
Subsidiaries GECS [Member] | Total [Member] | Estimated Fair Value [Member]
     
Investment [Line Items]     
Marketable Securities46,458 46,458 43,938
Subsidiaries [Member]
     
Investment [Line Items]     
Investment securities amortized cost18 18 19
Investment securities gross unrealized gains0 0 0
Investment securities gross unrealized loss0 0 0
Investment securities estimated fair value$ 18 $ 18 $ 19