Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Tax Rate Reconciliation, Percent
Statutory U.S. federal income tax rate		21.00%	21.00%	21.00%
Tax on international activities		(1.50%)	0.70%	(1.00%)
Tax audit settlements		0.00%	(7.00%)	0.00%
U.S. tax reform		0.00%	0.00%	29.70%
Tax charges related to Separation Transactions and Raytheon Merger		(17.70%)	0.00%	0.00%
Disposals of businesses		(7.50%)	0.00%	0.00%
U.S. research and development credit		6.10%	(2.40%)	(2.90%)
Goodwill impairment		(28.40%)	0.00%	0.00%
State income tax, net		2.40%	0.40%	(0.20%)
Foreign Derived Intangible Income (FDII)		3.50%	(3.30%)	(4.10%)
Other		(2.30%)	0.70%	1.30%
Effective income tax rate		(24.40%)	10.10%	43.80%
Effective Tax Rate Reconciliation, Amount
Statutory U.S. federal income tax rate		$ (494)	$ 872	$ 526
Tax on international activities		35	32	(25)
Tax audit settlements	$ 25	0	(290)	0
U.S. tax reform		0	0	744
Tax charges related to Separation Transactions and Raytheon Merger		416	0	0
Disposals of businesses		177	0	0
U.S. research and development credit		(142)	(101)	(73)
Goodwill impairment		668	0	0
State income tax, net		(56)	16	(6)
Foreign Derived Intangible Income (FDII)		(83)	(138)	(102)
Other		54	30	34
Effective income tax rate		$ 575	$ 421	$ 1,098