Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 1,539	$ 11,225	$ 1,383	$ 2,541
Accounts receivable, net	1,815	1,054
Unbilled receivables, net	5,272	3,465
Inventoried costs, net	690	398
Prepaid expenses and other current assets	406	445
Total current assets	9,722	16,587
Property, plant and equipment, net of accumulated depreciation of $5,187 for 2018 and $5,066 for 2017	5,864	4,225
Goodwill	18,747	12,455
Intangible Assets, net	1,329	52
Deferred tax assets	179	447
Other non-current assets	1,537	1,362
Total assets	37,378	35,128
Liabilities
Trade accounts payable	1,824	1,661
Accrued employee compensation	1,451	1,382
Advance payments and amounts in excess of costs incurred	1,711	1,761
Other current liabilities	2,847	2,288
Total current liabilities	7,833	7,092
Long-term debt, net of current portion of $744 for 2018 and $867 for 2017	14,387	14,399
Pension and other post-retirement benefit plan liabilities	5,755	5,511
Other non-current liabilities	1,176	994
Total liabilities	29,151	27,996
Commitments and contingencies
Shareholders’ equity
Preferred stock, $1 par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $1 par value; 800,000,000 shares authorized; issued and outstanding: 2018—174,254,250 and 2017—174,085,619	174	174
Paid-in capital	0	44
Retained earnings	13,669	11,632
Accumulated other comprehensive loss	(5,616)	(4,718)
Total shareholders’ equity	8,227	7,132	$ 6,036
Total liabilities and shareholders’ equity	$ 37,378	$ 35,128