Shareowners' Equity (RNCI) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest balance at January 1	$ 3,025	$ 2,972	$ 2,972
Net earnings (loss)	(81)	(53)
Dividends	(10)	(9)
Redemption value adjustment	(73)	(32)
Other	47	94
Redeemable noncontrolling interest ending balance(a)	3,054	3,036	$ 3,025
Alstom Acquisition
Redeemable Noncontrolling Interest [Line Items]
Other	$ 2,760	$ 2,928