Shareowners' Equity (RNCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest balance at January 1	$ 3,070	$ 79	$ 2,972	$ 98
Net earnings	(82)	0	(221)	(3)
Dividends	(8)	0	(17)	(11)
Redemption value adjustment	(68)	0	(178)	(1)
Other(a)	3	3	138	(4)
Redeemable noncontrolling interest ending balance	$ 3,051	$ 82	3,051	$ 82
Alstom Acquisition
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest balance at January 1			$ 2,900