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Investment Securities (Gross Realized Gain Losses) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Available For Sale Investment Securities Gross Realized Gain Losses [Line Items]        
Total $ (13) $ (11) $ (45) $ 34
Subsidiaries [Member]
       
Available For Sale Investment Securities Gross Realized Gain Losses [Line Items]        
Gains 0 0 0 0
Losses, including impairments 0 0 0 0
Total 0 0 0 0
Subsidiaries GECC [Member]
       
Available For Sale Investment Securities Gross Realized Gain Losses [Line Items]        
Gains 21 45 59 161
Losses, including impairments (34) (56) (104) (127)
Total $ (13) $ (11) $ (45) $ 34