Investment Securities (Investment) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Investments	$ 41,949	$ 44,313
GE
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	38,220	40,665
Gross unrealized gains	3,971	3,917
Gross unrealized losses	(242)	(269)
Estimated fair value	41,949	44,313
Investments	200	137
GE \| U.S. Corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	20,197	20,049
Gross unrealized gains	3,165	3,081
Gross unrealized losses	(84)	(85)
Estimated fair value	23,279	23,046
GE \| Non-U.S. Corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	9,468	11,917
Gross unrealized gains	89	98
Gross unrealized losses	(22)	(27)
Estimated fair value	9,535	11,987
GE \| State and Municipal
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,921	3,916
Gross unrealized gains	432	412
Gross unrealized losses	(80)	(92)
Estimated fair value	4,274	4,236
GE \| Mortgage and Asset-backed
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,723	2,787
Gross unrealized gains	102	111
Gross unrealized losses	(28)	(37)
Estimated fair value	2,797	2,861
GE \| Government and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,744	1,842
Gross unrealized gains	86	160
Gross unrealized losses	(27)	(26)
Estimated fair value	1,803	1,976
GE \| Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	167	154
Gross unrealized gains	95	55
Gross unrealized losses	(1)	(1)
Estimated fair value	$ 262	$ 208

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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