Pension and Other Employee Benefits (Schedule of Marketable Securities) (Details) - USD ($) $ in Millions	Apr. 02, 2017	Dec. 31, 2016
Fair Value, Inputs, Level 1 [Member] \| Marketable Securities in Trust [Member]
Marketable Securities [Line Items]
Marketable securities held in trust	$ 575	$ 550

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant