UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 385	$ 363
Billed receivables, net of allowances of $11 in 2017 and $13 in 2016	843	731
Contracts in process	2,200	2,055
Inventories	355	330
Other current assets	238	218
Total current assets	4,021	3,697
Property, plant and equipment, net	1,113	1,121
Goodwill	6,739	6,560
Identifiable intangible assets	296	238
Other assets	263	249
Total assets	12,432	11,865
Current liabilities:
Accounts payable, trade	360	299
Accrued employment costs	494	516
Accrued expenses	409	375
Advance payments and billings in excess of costs incurred	492	492
Income taxes payable	14	22
Other current liabilities	426	431
Total current liabilities	2,195	2,135
Pension and postretirement benefits	1,186	1,177
Deferred income taxes	302	236
Other liabilities	375	368
Long-term debt	3,327	3,325
Total liabilities	7,385	7,241
Commitments and contingencies (see Note 18)
Shareholders' equity:
Common stock: $.01 par value; 300,000,000 shares authorized, 78,003,140 shares outstanding at June 30, 2017 and 77,232,204 shares outstanding at December 31, 2016	6,396	6,285
Treasury stock (at cost), 82,544,813 shares at June 30, 2017 and 82,385,075 shares at December 31, 2016	(7,250)	(7,224)
Retained earnings	6,466	6,218
Accumulated other comprehensive loss	(636)	(726)
Total shareholders' equity	4,976	4,553
Noncontrolling interests	71	71
Total equity	5,047	4,624
Total liabilities and equity	$ 12,432	$ 11,865