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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The tables below reconcile revenue disaggregation by customer class to segment revenue as well as to revenues reflected on the Statements of Consolidated Income (Loss):
Year Ended December 31, 2021 (in millions)
Gas Distribution OperationsElectric Operations
Corporate and Other(2)
Total
Customer Revenues(1)
Residential$2,109.4 $567.9 $— $2,677.3 
Commercial722.4 534.9 — 1,257.3 
Industrial195.7 493.4 — 689.1 
Off-system71.3 — — 71.3 
Miscellaneous27.3 8.2 0.8 36.3 
Total Customer Revenues$3,126.1 $1,604.4 $0.8 $4,731.3 
Other Revenues45.1 91.9 31.3 168.3 
Total Operating Revenues$3,171.2 $1,696.3 $32.1 $4,899.6 
(1)Customer revenue amounts exclude intersegment revenues. See Note 23, "Segments of Business," for discussion of intersegment revenues.
(2)Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.
Year Ended December 31, 2020 (in millions)
Gas Distribution OperationsElectric Operations
Corporate and Other(2)
Total
Customer Revenues(1)
Residential$2,075.0 $527.8 $— $2,602.8 
Commercial670.5 480.3 — 1,150.8 
Industrial212.8 412.1 — 624.9 
Off-system41.0 — — 41.0 
Miscellaneous32.7 20.2 0.8 53.7 
Total Customer Revenues$3,032.0 $1,440.4 $0.8 $4,473.2 
Other Revenues96.1 95.5 16.9 208.5 
Total Operating Revenues$3,128.1 $1,535.9 $17.7 $4,681.7 
(1)Customer revenue amounts exclude intersegment revenues. See Note 23, "Segments of Business," for discussion of intersegment revenues.
(2)Other revenues related to the Transition Services Agreement entered into in connection with the sale of the Massachusetts Business.
Year Ended December 31, 2019 (in millions)
Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Customer Revenues(1)
Residential$2,309.0 $481.6 $— $2,790.6 
Commercial771.3 486.6 — 1,257.9 
Industrial245.2 607.7 — 852.9 
Off-system77.7 — — 77.7 
Miscellaneous52.0 21.5 0.8 74.3 
Total Customer Revenues$3,455.2 $1,597.4 $0.8 $5,053.4 
Other Revenues54.5 101.0 — 155.5 
Total Operating Revenues$3,509.7 $1,698.4 $0.8 $5,208.9 
(1)Customer revenue amounts exclude intersegment revenues. See Note 23, "Segments of Business," for discussion of intersegment revenues.
Customer Accounts Receivable The opening and closing balances of customer receivables for the year ended December 31, 2021, are presented in the table below. We had no significant contract assets or liabilities during the period. Additionally, we have not incurred any significant costs to obtain or fulfill contracts.
(in millions)Customer Accounts Receivable, Billed (less reserve)Customer Accounts Receivable, Unbilled (less reserve)
Balance as of December 31, 2020$400.0 $327.2 
Balance as of December 31, 2021459.6 337.0 
Financing Receivable, Allowance for Credit Loss A rollforward of our allowance for credit losses as of December 31, 2021 and December 31, 2020, are presented in the tables below:
(in millions)Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Balance as of January 1, 2021
$41.8 $9.7 $0.8 $52.3 
Current period provisions5.8 1.4 — 7.2 
Write-offs charged against allowance(46.7)(7.7)— (54.4)
Recoveries of amounts previously written off18.0 0.4 — 18.4 
Balance as of December 31, 2021
$18.9 $3.8 $0.8 $23.5 
(in millions)Gas Distribution OperationsElectric OperationsCorporate and OtherTotal
Balance as of January 1, 2020
$9.1 $3.1 $0.8 $13.0 
Current period provisions45.3 9.3 — 54.6 
Write-offs charged against allowance(26.7)(3.0)— (29.7)
Recoveries of amounts previously written off14.1 0.3 — 14.4 
Balance as of December 31, 2020
$41.8 $9.7 $0.8 $52.3