UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 29, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,366	$ 662
Billed receivables, net of allowances of $18 in 2018 and 2017	863	723
Contract assets	1,611	0
Contracts in process	0	1,933
Inventories	934	389
Prepaid expenses and other current assets	332	300
Assets held for sale	0	135
Assets of discontinued operations	0	306
Total current assets	5,106	4,448
Property, plant and equipment, net	1,137	1,110
Goodwill	6,651	6,615
Identifiable intangible assets	288	292
Other assets	348	264
Total assets	13,530	12,729
Current liabilities:
Current portion of long-term debt	581	0
Accounts payable, trade	588	531
Accrued employment costs	453	493
Accrued expenses	264	217
Contract liabilities	554	0
Advance payments and billings in excess of costs incurred	0	509
Income taxes payable	25	19
Other current liabilities	338	367
Liabilities held for sale	0	17
Liabilities of discontinued operations	0	226
Total current liabilities	2,803	2,379
Pension and postretirement benefits	1,290	1,313
Deferred income taxes	190	158
Other liabilities	416	398
Long-term debt	3,319	3,330
Total liabilities	8,018	7,578
Commitments and contingencies (see Note 19)
Shareholders’ equity:
Common stock: $.01 par value; 300,000,000 shares authorized, 78,242,526 shares outstanding at June 29, 2018 and 77,876,687 shares outstanding at December 31, 2017	6,723	6,519
Treasury stock (at cost), 84,821,829 shares at June 29, 2018 and 83,362,412 shares at December 31, 2017	(7,691)	(7,404)
Retained earnings	7,126	6,659
Accumulated other comprehensive loss	(714)	(691)
Total shareholders’ equity	5,444	5,083
Noncontrolling interests	68	68
Total equity	5,512	5,151
Total liabilities and equity	$ 13,530	$ 12,729