Accounts Receivable (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Accounts Receivables [Line Items]
Less valuation allowance, Current		$ (62)	$ (65)
Accounts receivable, Net, Current		10,516	8,832
U S Government Contracts [Member]
Accounts Receivables [Line Items]
Accounts Receivable, Gross, Current		5,989	4,639
Commercial Airplanes Accounts Receivable [Member]
Accounts Receivables [Line Items]
Accounts Receivable, Gross, Current		1,542	1,375
Global Services Accounts Receivable Excluding US Government Contracts [Member]
Accounts Receivables [Line Items]
Accounts Receivable, Gross, Current	[1]	1,472	1,257
Defense, Space & Security Customers Excluding US Government Contracts [Member]
Accounts Receivables [Line Items]
Accounts Receivable, Gross, Current	[1]	760	533
Reinsurance Receivables [Member]
Accounts Receivables [Line Items]
Accounts Receivable, Gross, Current		467	526
Other Account Receivable [Member]
Accounts Receivables [Line Items]
Accounts Receivable, Gross, Current		$ 348	$ 567

[1] Excludes U.S. government contracts