Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable [Line Items]
Total accounts receivable	$ 3,544	$ 3,759
Non-U.S. Government
Accounts Receivable [Line Items]
Total accounts receivable	1,847	2,035
Receivables related to long-term production programs	1,700	1,900
Receivables related to long-term production programs, net of customer advances	(295)	(338)
U.S. Government
Accounts Receivable [Line Items]
Total accounts receivable	1,076	1,189
Commercial
Accounts Receivable [Line Items]
Total accounts receivable	$ 621	$ 535