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Revenue Recognition Summary of Contract Assets and Liabilities (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Change in Accounts Receivable [Roll Forward]  
Opening balance as of December 31, 2019 $ 566
Closing balance as of June 30, 2020 565
Increase (Decrease) in Accounts Receivable on Contracts with Customers (1)
Change in Other Accrued Unbilled Revenues [Roll Forward]  
Opening balance as of December 31, 2019 469
Closing balance as of June 30, 2020 276
Increase (Decrease) in Unbilled Receivables (193)
Change in Contract Asset [Roll Forward]  
Opening balance as of December 31, 2019 6
Closing balance as of June 30, 2020 16
Increase (Decrease) in Contract with Customer, Asset 10
Change in Contract Liability [Roll Forward]  
Opening balance as of December 31, 2019 30
Closing balance as of June 30, 2020 26
Increase (Decrease) in Contract with Customer, Liability (4)
Contract with Customer, Liability, Revenue Recognized 28
Houston Electric [Member]  
Change in Accounts Receivable [Roll Forward]  
Opening balance as of December 31, 2019 210
Closing balance as of June 30, 2020 282
Increase (Decrease) in Accounts Receivable on Contracts with Customers 72
Change in Other Accrued Unbilled Revenues [Roll Forward]  
Opening balance as of December 31, 2019 117
Closing balance as of June 30, 2020 125
Increase (Decrease) in Unbilled Receivables 8
Change in Contract Liability [Roll Forward]  
Opening balance as of December 31, 2019 3
Closing balance as of June 30, 2020 5
Increase (Decrease) in Contract with Customer, Liability 2
Contract with Customer, Liability, Revenue Recognized 2
CERC Corp [Member]  
Change in Accounts Receivable [Roll Forward]  
Opening balance as of December 31, 2019 222
Closing balance as of June 30, 2020 155
Increase (Decrease) in Accounts Receivable on Contracts with Customers (67)
Change in Other Accrued Unbilled Revenues [Roll Forward]  
Opening balance as of December 31, 2019 249
Closing balance as of June 30, 2020 83
Increase (Decrease) in Unbilled Receivables $ (166)