Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 3,517	$ 4,907
Accounts receivable, net	1,710	1,501
Unbilled receivables, net	5,519	5,140
Inventoried costs, net	860	759
Prepaid expenses and other current assets	647	1,402
Assets of disposal group held for sale	0	1,635
Total current assets	12,253	15,344
Property, plant and equipment, net of accumulated depreciation of $6,471 for 2021 and $6,335 for 2020	7,093	7,071
Operating lease right-of-use assets	1,552	1,533
Goodwill	17,518	17,518
Intangible assets, net	732	783
Deferred tax assets	311	311
Other non-current assets	1,964	1,909
Total assets	41,423	44,469
Liabilities
Trade accounts payable	1,895	1,806
Accrued employee compensation	1,542	1,997
Advance payments and billings in excess of costs incurred	2,393	2,517
Other current liabilities	2,537	3,002
Liabilities of disposal group held for sale	0	258
Total current liabilities	8,367	9,580
Long-term debt, net of current portion of $42 for 2021 and $742 for 2020	12,764	14,261
Pension and other postretirement benefit plan liabilities	6,217	6,498
Operating lease liabilities	1,354	1,343
Other non-current liabilities	2,196	2,208
Total liabilities	30,898	33,890
Commitments and contingencies (Note 6)
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: 2021—160,960,496 and 2020—166,717,179	161	167
Paid-in capital	8	58
Retained earnings	10,487	10,482
Accumulated other comprehensive loss	(131)	(128)
Total shareholders’ equity	10,525	10,579
Total liabilities and shareholders’ equity	$ 41,423	$ 44,469