CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 363	$ 207
Billed receivables, net of allowances of $13 in 2016 and $15 in 2015	731	746
Contracts in process	2,055	2,081
Inventories	330	333
Other current assets	218	201
Assets of discontinued operations	0	664
Total current assets	3,697	4,232
Property, plant and equipment, net	1,121	1,097
Goodwill	6,560	6,281
Identifiable intangible assets	238	199
Other assets	249	260
Total assets	11,865	12,069
Current liabilities:
Current portion of long-term debt	0	499
Accounts payable, trade	299	297
Accrued employment costs	516	504
Accrued expenses	375	390
Advance payments and billings in excess of costs incurred	492	562
Income taxes payable	22	13
Other current liabilities	431	394
Liabilities of discontinued operations	0	220
Total current liabilities	2,135	2,879
Pension and postretirement benefits	1,177	1,047
Deferred income taxes	236	219
Other liabilities	368	368
Long-term debt	3,325	3,127
Total liabilities	7,241	7,640
Commitments and contingencies (see Note 18)
Shareholders' equity:
Common stock: $.01 par value; 300,000,000 shares authorized, 77,232,204 shares outstanding at December 31, 2016 and 78,133,763 shares outstanding at December 31, 2015	6,285	6,052
Treasury stock (at cost), 82,385,075 shares at December 31, 2016 and 79,375,063 shares at December 31, 2015	(7,224)	(6,851)
Retained earnings	6,218	5,728
Accumulated other comprehensive loss	(726)	(574)
Total shareholders' equity	4,553	4,355
Noncontrolling interests	71	74
Total equity	4,624	4,429
Total liabilities and equity	$ 11,865	$ 12,069