UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 374	$ 662
Billed receivables, net of allowances of $18 in 2018 and 2017	798	723
Contract assets	1,499	0
Contracts in process	0	1,933
Inventories	994	389
Prepaid expenses and other current assets	392	300
Assets held for sale	136	135
Assets of discontinued operations	287	306
Total current assets	4,480	4,448
Property, plant and equipment, net	1,131	1,110
Goodwill	6,632	6,615
Identifiable intangible assets	284	292
Other assets	346	264
Total assets	12,873	12,729
Current liabilities:
Accounts payable, trade	587	531
Accrued employment costs	446	493
Accrued expenses	197	217
Contract liabilities	607	0
Advance payments and billings in excess of costs incurred	0	509
Income taxes payable	6	19
Other current liabilities	319	367
Liabilities held for sale	19	17
Liabilities of discontinued operations	154	226
Total current liabilities	2,335	2,379
Pension and postretirement benefits	1,313	1,313
Deferred income taxes	177	158
Other liabilities	397	398
Long-term debt	3,331	3,330
Total liabilities	7,553	7,578
Commitments and contingencies (see Note 19)
Shareholders’ equity:
Common stock: $.01 par value; 300,000,000 shares authorized, 78,387,750 shares outstanding at March 30, 2018 and 77,876,687 shares outstanding at December 31, 2017	6,607	6,519
Treasury stock (at cost), 83,943,641 shares at March 30, 2018 and 83,362,412 shares at December 31, 2017	(7,523)	(7,404)
Retained earnings	6,814	6,659
Accumulated other comprehensive loss	(645)	(691)
Total shareholders’ equity	5,253	5,083
Noncontrolling interests	67	68
Total equity	5,320	5,151
Total liabilities and equity	$ 12,873	$ 12,729