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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Line Items]  
Assets Acquired and Liabilities Assumed
As of the closing date, the estimated fair value of the assets purchased and the liabilities assumed by WPL were as follows (in millions):
Property, plant and equipment, net

$81

Liabilities
7

Net assets acquired

$74



WPL [Member]  
Property, Plant and Equipment [Line Items]  
Assets Acquired and Liabilities Assumed
As of the closing date, the estimated fair value of the assets purchased and the liabilities assumed by WPL were as follows (in millions):
Property, plant and equipment, net

$81

Liabilities
7

Net assets acquired

$74