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Severance and Restructuring Charges (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Jun. 24, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Severance charges		$ 96	$ 0	$ 80
RMS
Restructuring Cost and Reserve [Line Items]
Severance and restructuring charges	$ 96
Severance and restructuring charges, net of tax	$ 76
Severance and restructuring charges (in dollars per share)	$ 0.26
Severance charges	$ 75
Aeronautics
Restructuring Cost and Reserve [Line Items]
Severance charges				$ 80
Operations Consolidation
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		$ 33
Operations Consolidation | RMS
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	$ 21

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Restructuring Charges, Net Of Tax

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Restructuring Charges, Per Share

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The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are voluntarily and involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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Severance and Restructuring Costs

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Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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