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Related Parties (Tables)
3 Months Ended
Mar. 31, 2020
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases The amounts billed for services provided, sales credited and purchases for the three months ended March 31 were as follows (in millions):
 
IPL
 
WPL
 
2020
 
2019
 
2020
 
2019
Corporate Services billings

$37

 

$43

 

$32

 

$33

Sales credited
15

 
15

 
2

 
1

Purchases billed
81

 
84

 
20

 
30



Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
 
IPL
 
WPL
 
March 31, 2020
 
December 31, 2019
 
March 31, 2020
 
December 31, 2019
Net payables to Corporate Services
$110
 
$112
 
$72
 
$85

Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
 
2020
 
2019
ATC billings to WPL

$28

 

$27

WPL billings to ATC
3

 
4


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 months ended March 31 were as follows (in millions):
 
IPL
 
WPL
 
2020
 
2019
 
2020
 
2019
Corporate Services billings

$37

 

$43

 

$32

 

$33

Sales credited
15

 
15

 
2

 
1

Purchases billed
81

 
84

 
20

 
30



Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
 
IPL
 
WPL
 
March 31, 2020
 
December 31, 2019
 
March 31, 2020
 
December 31, 2019
Net payables to Corporate Services
$110
 
$112
 
$72
 
$85

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 months ended March 31 were as follows (in millions):
 
IPL
 
WPL
 
2020
 
2019
 
2020
 
2019
Corporate Services billings

$37

 

$43

 

$32

 

$33

Sales credited
15

 
15

 
2

 
1

Purchases billed
81

 
84

 
20

 
30



Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
 
IPL
 
WPL
 
March 31, 2020
 
December 31, 2019
 
March 31, 2020
 
December 31, 2019
Net payables to Corporate Services
$110
 
$112
 
$72
 
$85

Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
 
2020
 
2019
ATC billings to WPL

$28

 

$27

WPL billings to ATC
3

 
4