SIGNIFICANT ACCOUNTING POLICY UPDATES (Details)	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) program $ / shares	Sep. 24, 2017 USD ($) $ / shares	Mar. 26, 2017 USD ($) $ / shares	Jun. 24, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) program contract $ / shares	Sep. 24, 2017 USD ($) $ / shares	Mar. 25, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Number of types of contracts | contract					3
Performance obligation satisfied in previous period	$ 595,000,000	$ 385,000,000			$ 1,600,000,000	$ 1,300,000,000
Customer receivables sold	41,000,000	146,000,000			268,000,000	511,000,000
Gains or losses related to sales of receivables	0	0			0	0
Contracts Accounted for under Percentage of Completion
Disaggregation of Revenue [Line Items]
Increase in operating profit due to profit rate adjustments	545,000,000	365,000,000			1,400,000,000	1,200,000,000
Increase in net earnings due to profit rate adjustments	$ 431,000,000	$ 237,000,000			$ 1,100,000,000	$ 765,000,000
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share) | $ / shares	$ 1.50	$ 0.82			$ 3.93	$ 2.63
EADGE-T
Disaggregation of Revenue [Line Items]
Contract loss incurred, gross			$ 120,000,000
Contract loss incurred, after tax			$ 74,000,000
Contract loss incurred, earnings per share (in dollars per share) | $ / shares			$ 0.25
Cumulative losses on development	$ 260,000,000				$ 260,000,000		$ 260,000,000
LM 2100 Project
Disaggregation of Revenue [Line Items]
Contract loss incurred, gross					75,000,000
Contract loss incurred, after tax					$ 56,000,000
Contract loss incurred, earnings per share (in dollars per share) | $ / shares					$ 0.20
Cumulative losses on development				$ 380,000,000
Warrior Capability Sustainment Program
Disaggregation of Revenue [Line Items]
Contract loss incurred, gross				85,000,000
Contract loss incurred, after tax				$ 64,000,000
Contract loss incurred, earnings per share (in dollars per share) | $ / shares				$ 0.22
Cumulative losses on development	$ 140,000,000			$ 140,000,000	$ 140,000,000
Space
Disaggregation of Revenue [Line Items]
Number of commercial satellite programs with performance issues | program	2				2