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Investment Securities (Gross Realized Gain Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Total $ 6 $ 41 $ (231)
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 1,718 5,746 1,898
GE      
Schedule of Available-for-sale Securities [Line Items]      
Gains 11 7 3
Losses, including impairments (12) (36) (218)
Total (2) (29) (215)
GE Capital      
Schedule of Available-for-sale Securities [Line Items]      
Gains 50 121 87
Losses, including impairments (43) (51) (104)
Total $ 7 $ 70 $ (16)