Goodwill and Acquired Intangibles - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 06, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expense for acquired finite lived intangible assets	$ 296	$ 312	$ 284
Amortization of finite lived intangible assets in 2019	285
Amortization of finite lived intangible assets in 2020	263
Amortization of finite lived intangible assets in 2021	256
Amortization of finite lived intangible assets in 2022	253
Amortization of finite lived intangible assets in 2023	250
Amortization of finite lived intangible assets after 2023	1,300
Sikorsky Aircraft Corporation
Finite-Lived Intangible Assets [Line Items]
Customer contractual obligations acquired				$ 507
Performance obligation satisfied in previous period	$ 325
Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	20 years
Customer programs | Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	9 years
Customer programs | Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	20 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	4 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	10 years
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	3 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	10 years