Accounts Receivable (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts Receivables [Line Items]
Accounts receivable, net		$ 1,955		$ 3,266
Accounts Receivable, Allowance for Credit Loss		(444)	$ (138)	(73)
U.S. Government Contracts
Accounts Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	[1]	811		1,121
Commercial Airplanes Accounts Receivable
Accounts Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current		17		29
Global Services Accounts Receivable
Accounts Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	[2]	1,437		1,967
Defense, Space, & Security Accounts Receivable
Accounts Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	[2]	120		220
Other Accounts Receivable
Accounts Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current		$ 14		$ 2

[1] Includes foreign military sales through the U.S. government

[2] Excludes U.S. government contracts