Goodwill and Acquired Intangibles - Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions		12 Months Ended
	Nov. 18, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 10,769	$ 10,807
Distributed Energy Solutions divestiture		(175)
Other		10	(38)
Goodwill, ending balance		10,604	10,769
Aeronautics
Goodwill [Roll Forward]
Goodwill, beginning balance		171	171
Distributed Energy Solutions divestiture		0
Other		0	0
Goodwill, ending balance		171	171
MFC
Goodwill [Roll Forward]
Goodwill, beginning balance		2,262	2,265
Distributed Energy Solutions divestiture	$ (175)	(175)
Other		2	(3)
Goodwill, ending balance		2,089	2,262
RMS
Goodwill [Roll Forward]
Goodwill, beginning balance		6,751	6,784
Distributed Energy Solutions divestiture		0
Other		7	(33)
Goodwill, ending balance		6,758	6,751
Space
Goodwill [Roll Forward]
Goodwill, beginning balance		1,585	1,587
Distributed Energy Solutions divestiture		0
Other		1	(2)
Goodwill, ending balance		$ 1,586	$ 1,585