Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Basis of Presentation (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
Basis of Presentation (Details) - USD ($) $ in Millions	Feb. 02, 2018	Feb. 28, 2018	Dec. 31, 2017	Mar. 31, 2018
Business Acquisition [Line Items]
Tax cuts and jobs act of 2017, provisional income tax expense			$ 57
Aclara
Business Acquisition [Line Items]
Consideration transferred to acquire business	$ 1,100	$ 1,100
Pro Forma \| Accounting Standards Update 2016-02
Business Acquisition [Line Items]
Lease, right-of-use asset (less than)				$ 100