Subsequent Events (Details) - USD ($)	3 Months Ended
Dec. 31, 2018	Jul. 20, 2018
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, authorized amount		$ 750,000,000
Forecast
Subsequent Event [Line Items]
Proceeds from divestiture of businesses	$ 4,200,000,000

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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