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Related Parties (Tables)
6 Months Ended
Jun. 30, 2017
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases
The amounts billed for services provided, sales credited and purchases for the three and six months ended June 30 were as follows (in millions):
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Corporate Services billings

$43

 

$45

 

$82

 

$83

 

$32

 

$37

 

$63

 

$70

Sales credited
5

 
2

 
7

 
3

 
2

 
2

 
2

 
3

Purchases billed
96

 
102

 
162

 
198

 
33

 
23

 
67

 
42

Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
 
IPL
 
WPL
 
June 30, 2017
 
December 31, 2016
 
June 30, 2017
 
December 31, 2016
Net payables to Corporate Services
$102
 
$104
 
$69
 
$72
Related Amounts Billed Between Parties
The related amounts billed between the parties for the three and six months ended June 30 were as follows (in millions):
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
ATC LLC billings to WPL

$27

 

$27

 

$53

 

$54

WPL billings to ATC LLC
3

 
3

 
6

 
6

IPL [Member]  
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases
The amounts billed for services provided, sales credited and purchases for the three and six months ended June 30 were as follows (in millions):
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Corporate Services billings

$43

 

$45

 

$82

 

$83

 

$32

 

$37

 

$63

 

$70

Sales credited
5

 
2

 
7

 
3

 
2

 
2

 
2

 
3

Purchases billed
96

 
102

 
162

 
198

 
33

 
23

 
67

 
42

Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
 
IPL
 
WPL
 
June 30, 2017
 
December 31, 2016
 
June 30, 2017
 
December 31, 2016
Net payables to Corporate Services
$102
 
$104
 
$69
 
$72
WPL [Member]  
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases
The amounts billed for services provided, sales credited and purchases for the three and six months ended June 30 were as follows (in millions):
 
IPL
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Corporate Services billings

$43

 

$45

 

$82

 

$83

 

$32

 

$37

 

$63

 

$70

Sales credited
5

 
2

 
7

 
3

 
2

 
2

 
2

 
3

Purchases billed
96

 
102

 
162

 
198

 
33

 
23

 
67

 
42

Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
 
IPL
 
WPL
 
June 30, 2017
 
December 31, 2016
 
June 30, 2017
 
December 31, 2016
Net payables to Corporate Services
$102
 
$104
 
$69
 
$72
Related Amounts Billed Between Parties
The related amounts billed between the parties for the three and six months ended June 30 were as follows (in millions):
 
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
ATC LLC billings to WPL

$27

 

$27

 

$53

 

$54

WPL billings to ATC LLC
3

 
3

 
6

 
6