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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Basis of Presentation (Details) - USD ($) $ in Millions		3 Months Ended
Basis of Presentation (Details) - USD ($) $ in Millions	Feb. 02, 2018	Dec. 31, 2017	Jun. 30, 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
Pro Forma \| Accounting Standards Update 2016-02
Business Acquisition [Line Items]
Lease, right-of-use asset			$ 100