Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Millions		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017
Current assets:
Cash and equivalents		$ 702		$ 963	$ 1,862		$ 2,983
Accounts receivable		3,673		3,759
Unbilled receivables		7,554		6,576
Inventories		6,480		5,977
Other current assets		1,148		914
Total current assets		19,557		18,189
Noncurrent assets:
Property, plant and equipment (PP&E)		9,238		8,972
Accumulated depreciation of PP&E		(5,147)		(4,994)
Intangible assets, net		2,457		2,585
Goodwill	[1]	19,662		19,594
Other assets		2,307		1,062
Net investment in subsidiaries		0		0
Total noncurrent assets		28,517		27,219
Total assets		48,074		45,408
Current liabilities:
Short-term debt and current portion of long-term debt		4,960		973
Customer advances and deposits		6,714		7,270
Other current liabilities		6,340		6,496
Total current liabilities		18,014		14,739
Noncurrent liabilities:
Long-term debt		8,975		11,444
Other liabilities		8,208		7,493
Total noncurrent liabilities		17,183		18,937
Total shareholders’ equity		12,877	$ 12,234	11,732	11,994	$ 11,774	11,435
Total liabilities and shareholders’ equity		48,074		45,408
Consolidating Adjustments
Current assets:
Cash and equivalents		0		0	0		0
Accounts receivable		0		0
Unbilled receivables		0		0
Inventories		0		0
Other current assets		0		0
Total current assets		0		0
Noncurrent assets:
Property, plant and equipment (PP&E)		0		0
Accumulated depreciation of PP&E		0		0
Intangible assets, net		0		0
Goodwill		0		0
Other assets		0		0
Net investment in subsidiaries		(27,981)		(25,313)
Total noncurrent assets		(27,981)		(25,313)
Total assets		(27,981)		(25,313)
Current liabilities:
Short-term debt and current portion of long-term debt		0		0
Customer advances and deposits		0		0
Other current liabilities		0		0
Total current liabilities		0		0
Noncurrent liabilities:
Long-term debt		0		0
Other liabilities		0		0
Total noncurrent liabilities		0		0
Total shareholders’ equity		(27,981)		(25,313)
Total liabilities and shareholders’ equity		(27,981)		(25,313)
Parent Company
Current assets:
Cash and equivalents		243		460	1,329		1,930
Accounts receivable		0		0
Unbilled receivables		0		0
Inventories		0		0
Other current assets		(59)		(45)
Total current assets		184		415
Noncurrent assets:
Property, plant and equipment (PP&E)		302		273
Accumulated depreciation of PP&E		(87)		(83)
Intangible assets, net		0		0
Goodwill		0		0
Other assets		194		195
Net investment in subsidiaries		27,981		25,313
Total noncurrent assets		28,390		25,698
Total assets		28,574		26,113
Current liabilities:
Short-term debt and current portion of long-term debt		4,741		850
Customer advances and deposits		0		0
Other current liabilities		564		552
Total current liabilities		5,305		1,402
Noncurrent liabilities:
Long-term debt		8,918		11,398
Other liabilities		1,474		1,581
Total noncurrent liabilities		10,392		12,979
Total shareholders’ equity		12,877		11,732
Total liabilities and shareholders’ equity		28,574		26,113
Guarantor Subsidiaries
Current assets:
Cash and equivalents		0		0	0		0
Accounts receivable		1,260		1,171
Unbilled receivables		2,864		2,758
Inventories		6,350		5,855
Other current assets		648		441
Total current assets		11,122		10,225
Noncurrent assets:
Property, plant and equipment (PP&E)		7,327		7,177
Accumulated depreciation of PP&E		(4,175)		(4,071)
Intangible assets, net		230		251
Goodwill		7,960		8,031
Other assets		1,015		274
Net investment in subsidiaries		0		0
Total noncurrent assets		12,357		11,662
Total assets		23,479		21,887
Current liabilities:
Short-term debt and current portion of long-term debt		0		0
Customer advances and deposits		4,194		4,541
Other current liabilities		4,036		3,944
Total current liabilities		8,230		8,485
Noncurrent liabilities:
Long-term debt		42		39
Other liabilities		4,583		4,073
Total noncurrent liabilities		4,625		4,112
Total shareholders’ equity		10,624		9,290
Total liabilities and shareholders’ equity		23,479		21,887
Non-Guarantor Subsidiaries
Current assets:
Cash and equivalents		459		503	$ 533		$ 1,053
Accounts receivable		2,413		2,588
Unbilled receivables		4,690		3,818
Inventories		130		122
Other current assets		559		518
Total current assets		8,251		7,549
Noncurrent assets:
Property, plant and equipment (PP&E)		1,609		1,522
Accumulated depreciation of PP&E		(885)		(840)
Intangible assets, net		2,227		2,334
Goodwill		11,702		11,563
Other assets		1,098		593
Net investment in subsidiaries		0		0
Total noncurrent assets		15,751		15,172
Total assets		24,002		22,721
Current liabilities:
Short-term debt and current portion of long-term debt		219		123
Customer advances and deposits		2,520		2,729
Other current liabilities		1,740		2,000
Total current liabilities		4,479		4,852
Noncurrent liabilities:
Long-term debt		15		7
Other liabilities		2,151		1,839
Total noncurrent liabilities		2,166		1,846
Total shareholders’ equity		17,357		16,023
Total liabilities and shareholders’ equity		$ 24,002		$ 22,721

[1] Goodwill in the Information Technology and Mission Systems reporting units is net of $536 and $1.3 billion of accumulated impairment losses, respectively.