Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Net income (loss) from continuing operations	$ 3,374	$ (3,143)
Adjustments to reconcile net income (loss) from continuing operations to net cash flows provided by operating activities:
Depreciation and amortization	3,413	3,003
Deferred income tax provision	(142)	(34)
Stock compensation cost	343	253
Net periodic pension and other postretirement income	(1,073)	(325)
Goodwill Impairment Charge	0	3,183
Change in:
Accounts receivable	(397)	567
Contract assets	(1,117)	699
Inventory	(57)	(111)
Other current assets	(275)	(381)
Accounts payable and accrued liabilities	425	(866)
Contract liabilities	83	354
Global pension contributions	(38)	(64)
Other operating activities, net	(558)	(171)
Net cash flows provided by operating activities from continuing operations	3,981	2,964
Investing Activities:
Capital expenditures	(1,180)	(1,172)
Investments in businesses (Note 2)	(6)	0
Dispositions of businesses, net of cash transferred (Note 2)	1,074	2,575
Cash acquired in Raytheon Merger (Note 2)	0	3,208
Customer financing assets receipts (payments), net	24	(138)
Increase in collaboration intangible assets	(138)	(136)
Receipts (payments) from settlements of derivative contracts, net	42	(115)
Other investing activities, net	45	(70)
Net cash flows (used in) provided by investing activities from continuing operations	(139)	4,152
Financing Activities:
Issuance of long-term debt	1,981	1,999
Distribution from discontinued operations	0	17,207
Repayment of long-term debt	(2,547)	(15,052)
Decrease in short-term borrowings, net	(41)	(2,060)
Proceeds from Common Stock issued under employee stock plans	3	6
Dividends paid on Common Stock	(2,212)	(2,026)
Repurchase of Common Stock	(2,000)	(47)
Net transfers to discontinued operations	(27)	(1,998)
Other financing activities, net	(339)	(85)
Net cash flows used in financing activities from continuing operations	(5,182)	(2,056)
Discontinued Operations:
Net cash used in operating activities	(27)	(693)
Net cash used in investing activities	0	(241)
Net cash provided by (used in) financing activities	27	(1,449)
Net cash used in discontinued operations	0	(2,383)
Effect of foreign exchange rate changes on cash and cash equivalents from continuing operations	10	11
Effect of foreign exchange rate changes on cash and cash equivalents from discontinued operations	0	(76)
Net (decrease) increase in cash, cash equivalents and restricted cash	(1,330)	2,612
Cash, cash equivalents and restricted cash, beginning of period	8,832	4,961
Cash, cash equivalents and restricted cash within assets related to discontinued operations, beginning of period	0	2,459
Cash, cash equivalents and restricted cash, end of period	7,502	10,032
Less: Restricted cash, included in Other assets	26	31
Cash and cash equivalents, end of period	$ 7,476	$ 10,001