Investigations, Claims, and Litigation (Narrative) (Details) - Bolivarian Republic of Venezuela $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($) frigates
Loss Contingencies
Number of Foreign Built Frigates \| frigates	2
Arbitral statement claim	$ 151
Litigation counter claim [Member]
Loss Contingencies
Arbitral statement claim	$ 22

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration