Consolidated Balance Sheets - USD ($)	Mar. 25, 2018	Dec. 31, 2017	Mar. 26, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 2,393,000,000	$ 2,861,000,000	$ 2,216,000,000	$ 1,837,000,000
Receivables, net	2,373,000,000	2,265,000,000
Contract assets	9,405,000,000	7,992,000,000
Inventories	3,196,000,000	2,878,000,000
Other current assets	449,000,000	1,509,000,000
Total current assets	17,816,000,000	17,505,000,000
Property, plant and equipment, net	5,749,000,000	5,775,000,000
Goodwill	10,806,000,000	10,807,000,000
Intangible assets, net	3,730,000,000	3,797,000,000
Deferred income taxes	3,084,000,000	3,156,000,000
Other noncurrent assets	5,449,000,000	5,580,000,000
Total assets	46,634,000,000	46,620,000,000
Current liabilities
Accounts payable	2,715,000,000	1,467,000,000
Contract liabilities	6,550,000,000	7,028,000,000
Salaries, benefits and payroll taxes	1,771,000,000	1,785,000,000
Current maturities of long-term debt	750,000,000	750,000,000
Other current liabilities	2,188,000,000	1,883,000,000
Total current liabilities	13,974,000,000	12,913,000,000
Long-term debt, net	13,473,000,000	13,513,000,000
Accrued pension liabilities	14,199,000,000	15,703,000,000
Other postretirement benefit liabilities	713,000,000	719,000,000
Other noncurrent liabilities	4,386,000,000	4,548,000,000
Total liabilities	46,745,000,000	47,396,000,000
Stockholders’ equity
Common stock, $1 par value per share	284,000,000	284,000,000
Additional paid-in capital	0	0
Retained earnings	14,123,000,000	11,405,000,000			$ 0
Accumulated other comprehensive loss	(14,589,000,000)	(12,539,000,000)
Total stockholders’ deficit	(182,000,000)	(850,000,000)
Noncontrolling interests in subsidiary	71,000,000	74,000,000
Total deficit	(111,000,000)	(776,000,000)	$ 1,482,000,000	$ 1,477,000,000
Total liabilities and equity	$ 46,634,000,000	$ 46,620,000,000