Subsequent Events (Details) - USD ($) $ in Millions		1 Months Ended
Feb. 01, 2018	Jan. 31, 2018	Nov. 30, 2017
Subsequent Event [Line Items]
Sale of business, consideration	$ 1,200
Proceeds from Divestiture of Businesses	$ 861
Cash Paid For Contract Termination		$ 60	$ 65

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration