Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Net income (loss) from continuing operations	$ 1,901	$ (3,328)
Adjustments to reconcile net income (loss) from continuing operations to net cash flows provided by operating activities:
Depreciation and amortization	2,255	1,839
Deferred income tax provision	175	118
Stock compensation cost	227	135
Net periodic pension and other postretirement income	(715)	(223)
Goodwill Impairment Charge	0	3,183
Goodwill Impairment Loss	0	3,183
Change in:
Accounts receivable	293	1,163
Contract assets	(557)	376
Inventory	(133)	(550)
Other current assets	(258)	(180)
Accounts payable and accrued liabilities	(733)	(1,395)
Contract liabilities	(45)	201
Global pension contributions	(25)	(42)
Other operating activities, net	(336)	45
Net cash flows provided by operating activities from continuing operations	2,049	1,342
Investing Activities:
Capital expenditures	(747)	(783)
Investments in businesses	(6)	0
Dispositions of businesses, net of cash transferred (Note 2)	1,074	234
Cash acquired in Raytheon Merger	0	3,208
Increase in customer financing assets, net	(102)	(129)
Increase in collaboration intangible assets	(60)	(106)
Receipts (payments) from settlements of derivative contracts, net	50	(286)
Other investing activities, net	30	(82)
Net cash flows provided by investing activities from continuing operations	239	2,056
Financing Activities:
Issuance of long-term debt	0	1,984
Distribution from discontinued operations	0	17,207
Repayment of long-term debt	(307)	(15,038)
Decrease in short-term borrowings, net	(51)	(2,045)
Proceeds from Common Stock issued under employee stock plans	2	10
Dividends paid on Common Stock	(1,461)	(1,338)
Repurchase of Common Stock	(1,007)	(47)
Net transfers to discontinued operations	(24)	(1,966)
Other financing activities, net	(271)	(99)
Net cash flows used in financing activities from continuing operations	(3,119)	(1,332)
Discontinued Operations:
Net cash used in operating activities	(24)	(661)
Net cash used in investing activities	0	(241)
Net cash provided by (used in) financing activities	24	(1,481)
Net cash used in discontinued operations	0	(2,383)
Effect of foreign exchange rate changes on cash and cash equivalents from continuing operations	79	(10)
Effect of foreign exchange rate changes on cash and cash equivalents from discontinued operations	0	(76)
Net decrease in cash, cash equivalents and restricted cash	(752)	(403)
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	8,080	7,017
Less: Restricted cash, included in Other assets	29	42
Cash and cash equivalents, end of period	$ 8,051	$ 6,975