Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 10,369	$ 11,225	$ 1,403	$ 2,541
Accounts receivable, net	1,241	1,054
Unbilled receivables, net	3,869	3,465
Inventoried costs, net	435	398
Prepaid expenses and other current assets	243	445
Total current assets	16,157	16,587
Property, plant and equipment, net of accumulated depreciation of $5,119 for 2018 and $5,066 for 2017	4,285	4,225
Goodwill	12,455	12,455
Deferred tax assets	474	447
Other non-current assets	1,424	1,414
Total assets	34,795	35,128
Liabilities
Trade accounts payable	1,395	1,661
Accrued employee compensation	1,204	1,382
Advance payments and amounts in excess of costs incurred	1,479	1,761
Other current liabilities	2,337	2,288
Total current liabilities	6,415	7,092
Long-term debt, net of current portion of $868 for 2018 and $867 for 2017	14,392	14,399
Pension and other post-retirement benefit plan liabilities	5,362	5,511
Other non-current liabilities	946	994
Total liabilities	27,115	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—174,382,256 and 2017—174,085,619	174	174
Paid-in capital	0	44
Retained earnings	13,205	11,632
Accumulated other comprehensive loss	(5,699)	(4,718)
Total shareholders’ equity	7,680	7,132	$ 5,672
Total liabilities and shareholders’ equity	$ 34,795	$ 35,128