Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement of Cash Flows [Abstract]
Net income (loss) from continuing operations	$ (3,143)	$ 3,000
Adjustments to reconcile net income (loss) from continuing operations to net cash flows provided by operating activities:
Depreciation and amortization	3,003	2,022
Deferred income tax provision	(34)	19
Stock compensation cost	253	192
Net periodic pension and other postretirement income	(325)	(471)
Goodwill Impairment Loss	3,183	0
Change in:
Accounts receivable	567	(38)
Contract assets	699	(702)
Inventory	(111)	(1,256)
Other current assets	(381)	(640)
Accounts payable and accrued liabilities	(866)	1,170
Contract liabilities	354	853
Global pension contributions	(64)	(41)
Canadian Government Settlement	0	(38)
Other operating activities, net	(171)	426
Net cash flows provided by operating activities from continuing operations	2,964	4,496
Investing Activities of Continuing Operations:
Capital expenditures	(1,172)	(1,122)
Dispositions of businesses (Note 2)	2,575	134
Cash acquired in Raytheon Merger	3,208	0
Increase in customer financing assets, net	(138)	(445)
Increase in collaboration intangible assets	(136)	(259)
Payments for (Proceeds from) Derivative Instrument, Investing Activities	(115)	160
Other investing activities, net	(70)	(200)
Net cash flows provided by (used in) investing activities from continuing operations	4,152	(1,732)
Financing Activities:
Issuance of long-term debt	1,999	2
Dividend from discontinued operations	17,207	0
Repayment of long-term debt	(15,052)	(612)
Decrease in short-term borrowings, net	(2,060)	(165)
Proceeds from Common Stock issued under employee stock plans	6	14
Dividends paid on Common Stock	(2,026)	(1,830)
Payments for Repurchase of Common Stock	(47)	(111)
Net transfers (to) from discontinued operations	(1,998)	1,256
Other financing activities, net	(85)	(38)
Net cash flows used in financing activities from continuing operations	(2,056)	(1,484)
Discontinued Operations:
Net cash (used in) provided by operating activities	(693)	1,605
Net cash used in investing activities	(241)	(241)
Net cash used in financing activities	(1,449)	(1,410)
Net cash flows used in discontinued operations	(2,383)	(46)
Effect of foreign exchange rate changes on cash and cash equivalents from continuing operations	11	(11)
Effect of foreign exchange rate changes on cash and cash equivalents from discontinued operations	(76)	(54)
Net increase in cash, cash equivalents and restricted cash	2,612	1,169
Cash, cash equivalents and restricted cash, beginning of period	4,961	3,731
Cash, cash equivalents and restricted cash within assets related to discontinued operations, beginning of period	2,459	2,481
Cash, cash equivalents and restricted cash, end of period	10,032	7,381
Less: Restricted cash	31	20
Less: Cash, cash equivalents and restricted cash for discontinued operations	0	2,378
Cash and cash equivalents, end of period	$ 10,001	$ 4,983