Business Combinations (Raytheon Company Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Apr. 03, 2020
Business Acquisition [Line Items]
Goodwill		$ 54,436	$ 54,285
Raytheon Company [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				$ 3,208
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				1,997
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Assets				6,023
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory				705
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other				940
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				4,745
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets				950
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				19,130
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets				1,218
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				38,916
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable				1,477
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Employee Compensation				1,492
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Liabilities				1,921
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Contract Liabilities				3,002
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt				4,700
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation				738
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Pension and Postretirement Liabilities				11,607
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				2,368
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				27,305
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				11,611
Goodwill				21,589
Business Combination, Acquisition of Noncontrolling Interest, Fair Value				(34)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				$ 33,166
Goodwill, Purchase Accounting Adjustments	$ 61