$ES
EVERSOURCE ENERGY Stock $es

$es Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000007274121000005 Filed on February 17, 2021

Income Statement

Concept	2019 Q4	2018	2017 Q4
Revenue	$2.050B	$8.448B	$1.896B
YoY Change	0.76%	8.98%	6.7%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$228.7M	$1.072B	$202.6M
YoY Change	10.06%	24.1%	10.29%
% of Gross Profit
Operating Expenses	$1.615B	$6.748B	$1.452B
YoY Change	-1.23%	15.09%	8.45%
Operating Profit	$435.6M	$1.700B	$443.7M
YoY Change	8.9%	-9.97%	1.28%
Interest Expense	-$86.30M	$498.8M	-$102.3M
YoY Change	-31.56%	18.26%	-0.1%
% of Operating Profit	-19.81%	29.34%	-23.06%
Other Income/Expense, Net	-$18.40M	$128.4M	$28.70M
YoY Change	-166.43%	19.0%	29.28%
Pretax Income	$331.0M	$1.330B	$370.3M
YoY Change	9.71%	-15.56%	3.46%
Income Tax	$79.10M	$289.0M	$131.0M
% Of Pretax Income	23.9%	21.74%	35.38%
Net Earnings	$251.9M	$1.041B	$239.4M
YoY Change	8.02%	4.52%	3.59%
Net Earnings / Revenue	12.29%	12.32%	12.63%
Basic Earnings Per Share	$0.77	$3.25	$0.75
Diluted Earnings Per Share	$0.76	$3.25	$0.75
COMMON SHARES
Basic Shares Outstanding	323.8M shares	317.4M shares	316.9M shares
Diluted Shares Outstanding		318.0M shares

Balance Sheet

Concept	2019 Q4	2018	2017 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$15.00M	$108.0M	$38.00M
YoY Change	-86.11%	184.21%	26.67%
Cash & Equivalents	$15.40M	$108.0M	$85.89M
Short-Term Investments
Other Short-Term Assets	$342.1M	$952.0M	$138.0M
YoY Change	31.09%	-25.74%	-35.89%
Inventory	$235.0M	$238.0M	$223.0M
Prepaid Expenses
Receivables	$989.4M	$994.0M	$925.1M
Other Receivables	$0.00	$0.00	$19.00M
Total Short-Term Assets	$2.415B	$2.292B	$2.487B
YoY Change	5.34%	-7.84%	0.38%
LONG-TERM ASSETS
Property, Plant & Equipment	$27.64B	$25.61B	$23.62B
YoY Change	7.9%	8.44%	10.62%
Goodwill	$4.427B		$4.427B
YoY Change	-0.07%		25.8%
Intangibles
YoY Change
Long-Term Investments	$871.6M	$418.0M	$277.6M
YoY Change	87.72%	-28.55%	17.18%
Other Assets	$512.2M	$5.494B	$605.7M
YoY Change	28.57%	7.66%	15.98%
Total Long-Term Assets	$11.12B	$35.95B	$10.12B
YoY Change	7.6%	6.57%	22.99%
TOTAL ASSETS
Total Short-Term Assets	$2.415B	$2.292B	$2.487B
Total Long-Term Assets	$11.12B	$35.95B	$10.12B
Total Assets	$41.12B	$38.24B	$36.22B
YoY Change	7.54%	5.58%	13.0%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.148B	$1.120B	$1.085B
YoY Change	2.49%	3.23%	22.67%
Accrued Expenses	$9.000M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$889.0M	$910.0M	$1.088B
YoY Change	-2.31%	-16.36%	-5.31%
Long-Term Debt Due	$327.4M	$890.0M	$549.6M
YoY Change	-60.9%	61.82%	-28.98%
Total Short-Term Liabilities	$3.606B	$4.113B	$3.589B
YoY Change	-12.33%	14.6%	-1.36%
LONG-TERM LIABILITIES
Long-Term Debt	$13.77B	$12.83B	$11.78B
YoY Change	12.43%	8.97%	33.37%
Other Long-Term Liabilities	$810.6M	$6.148B	$1.074B
YoY Change	11.02%	-2.66%	25.81%
Total Long-Term Liabilities	$14.58B	$18.98B	$9.614B
YoY Change	51.04%	4.91%	10.27%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.606B	$4.113B	$3.589B
Total Long-Term Liabilities	$14.58B	$18.98B	$9.614B
Total Liabilities	$18.19B	$26.60B	$13.20B
YoY Change	32.11%	6.49%	6.85%
SHAREHOLDERS EQUITY
Retained Earnings	$4.177B		$3.561B
YoY Change	5.64%		12.15%
Common Stock	$1.729B		$1.669B
YoY Change	3.59%		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$299.1M		$317.8M
YoY Change	-5.89%		0.0%
Treasury Stock Shares	15.98M shares		16.99M shares
Shareholders Equity	$12.63B	$11.64B	$11.09B
YoY Change
Total Liabilities & Shareholders Equity	$41.12B	$38.24B	$36.22B
YoY Change	7.54%	5.58%	13.0%

Cashflow Statement

Concept	2019 Q4	2018	2017 Q4
OPERATING ACTIVITIES
Net Income	$251.9M	$1.041B	$239.4M
YoY Change	8.02%	4.52%	3.59%
Depreciation, Depletion And Amortization	$228.7M	$1.072B	$202.6M
YoY Change	10.06%	24.1%	10.29%
Cash From Operating Activities	$514.7M	$1.831B	$520.4M
YoY Change	21.74%	-8.3%	-6.7%
INVESTING ACTIVITIES
Capital Expenditures	-$782.5M	$2.570B	-$705.8M
YoY Change	14.27%	9.45%	14.26%
Acquisitions
YoY Change
Other Investing Activities	-$40.00M	-$6.754M	-$872.6M
YoY Change	-14.16%	23.27%	406.74%
Cash From Investing Activities	-$822.5M	-$2.437B	-$1.578B
YoY Change	12.46%	-24.56%	99.82%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$425.4M	$0.00
YoY Change
Debt Paid & Issued, Net		$1.050B
YoY Change		40.98%
Cash From Financing Activities	272.9M	$729.9M	972.0M
YoY Change	-28.8%	-39.85%	281.63%
NET CHANGE
Cash From Operating Activities	514.7M	$1.831B	520.4M
Cash From Investing Activities	-822.5M	-$2.437B	-1.578B
Cash From Financing Activities	272.9M	$729.9M	972.0M
Net Change In Cash	-34.90M	$123.4M	-86.00M
YoY Change	-146.72%	-691.73%	-480.53%
FREE CASH FLOW
Cash From Operating Activities	$514.7M	$1.831B	$520.4M
Capital Expenditures	-$782.5M	$2.570B	-$705.8M
Free Cash Flow	$1.297B	-$739.4M	$1.226B
YoY Change	17.12%	110.11%	4.31%

Facts In Submission

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CY2020	dei	Entity Registrant Name EntityRegistrantName	EVERSOURCE ENERGY
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MA
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CY2019	us-gaap	Net Income Loss NetIncomeLoss	916572000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1040519000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7519000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	909053000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1033000000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.56
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.25
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.55
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.81
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.25
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	338836147	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	321416086	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317370369	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	339847062	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	322941636	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317993934	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1212686000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	916572000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1040519000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1596000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1393000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1756000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	342000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1166000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-547000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	13290000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	7618000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-5194000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-11352000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5059000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6403000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7519000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7519000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7519000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1193815000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	903994000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1039403000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	11086242000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1040519000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.02
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	640110000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7519000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-543000	USD
CY2018	es	Otherchangesinshareholdersequity Otherchangesinshareholdersequity	1825000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6403000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	11486817000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	916572000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.14
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	685979000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7519000	USD
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	868550000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	3434000	USD
CY2019	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	69474000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	16296000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5059000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	12629994000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1212686000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	2.27
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	767500000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7519000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	949660000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	7890000	USD
CY2020	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	71888000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	20667000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-11352000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	14063566000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1212686000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	916572000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1040519000	USD
CY2020	us-gaap	Depreciation Depreciation	981380000	USD
CY2019	us-gaap	Depreciation Depreciation	885278000	USD
CY2018	us-gaap	Depreciation Depreciation	819930000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	257154000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	209812000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	174812000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	53461000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	63446000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	61337000	USD
CY2020	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	12888000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	22000000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	5498000	USD
CY2020	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	111524000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	121782000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	194947000	USD
CY2020	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	516411000	USD
CY2019	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	124870000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-34920000	USD
CY2020	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	177679000	USD
CY2019	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	195380000	USD
CY2018	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	252026000	USD
CY2020	es	Proceeds From Payments For Items Related To Spent Nuclear Fuel ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel	0	USD
CY2019	es	Proceeds From Payments For Items Related To Spent Nuclear Fuel ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel	-29000000	USD
CY2018	es	Proceeds From Payments For Items Related To Spent Nuclear Fuel ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel	-145000000	USD
CY2020	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2019	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	68840000	USD
CY2018	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2020	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	0	USD
CY2019	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	239644000	USD
CY2018	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	0	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	174289000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	196087000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	111225000	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	351843000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	98716000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2009577000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1830543000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	24481000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	9591000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	141433000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	15404000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8074000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	831000	USD
CY2020	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-43819000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	16129000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	67770000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	122567000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	14866000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	11603000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-78226000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1682572000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2942996000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2911489000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2569936000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	434124000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	566592000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	900749000	USD
CY2020	es	Proceedsfrom Saleand Maturityof Marketable Securities Usedfor Paymentof Fuel ProceedsfromSaleandMaturityofMarketableSecuritiesUsedforPaymentofFuel	0	USD
CY2019	es	Proceedsfrom Saleand Maturityof Marketable Securities Usedfor Paymentof Fuel ProceedsfromSaleandMaturityofMarketableSecuritiesUsedforPaymentofFuel	0	USD
CY2018	es	Proceedsfrom Saleand Maturityof Marketable Securities Usedfor Paymentof Fuel ProceedsfromSaleandMaturityofMarketableSecuritiesUsedforPaymentofFuel	145000000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	401823000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	537258000	USD
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	908387000	USD
CY2020	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	1113252000	USD
CY2019	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	239673000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	416337000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	205150000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-23809000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-24204000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-6754000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4129275000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3274288000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2437046000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	928992000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	852254000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	744665000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	663239000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	640110000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7519000	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7519000	USD
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7519000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	14273000	USD
CY2020	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	13955000	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	325370000	USD
CY2018	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	379310000	USD
CY2020	es	Proceeds Payments Of Issuance Of Rate Reduction Bonds ProceedsPaymentsOfIssuanceOfRateReductionBonds	-43210000	USD
CY2019	es	Proceeds Payments Of Issuance Of Rate Reduction Bonds ProceedsPaymentsOfIssuanceOfRateReductionBonds	-52332000	USD
CY2018	es	Proceeds Payments Of Issuance Of Rate Reduction Bonds ProceedsPaymentsOfIssuanceOfRateReductionBonds	635663000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2760000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1520000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2200000000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	327236000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	801078000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1050330000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1006000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-28457000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2594590000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-92261000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1172450000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	729937000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	147887000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	123434000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	117063000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	209324000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	85890000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	264950000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	117063000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	209324000	USD
CY2019	es	Noncontrolling Interest Increasein Contributions From Parent NoncontrollingInterestIncreaseinContributionsFromParent	225000000	USD
CY2020	es	Numberof Electric Natural Gas And Water Customers NumberofElectricNaturalGasAndWaterCustomers	4300000	customer
CY2020Q4	us-gaap	Goodwill Goodwill	4450000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	4430000000	USD
CY2019	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	239600000	USD
CY2019	es	Tangible Asset Impairment Charges After Tax TangibleAssetImpairmentChargesAfterTax	204400000	USD
CY2019	es	Tangible Asset Impairment Charges After Tax Per Share TangibleAssetImpairmentChargesAfterTaxPerShare	0.64
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	206500000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	224800000	USD
CY2020	es	Accounts Receivable Allowance For Credit Loss Increase From Business Combination AccountsReceivableAllowanceForCreditLossIncreaseFromBusinessCombination	24200000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	53500000	USD
CY2020	es	Accounts Receivable Allowance For Credit Loss Deferred Expense Reversal AccountsReceivableAllowanceForCreditLossDeferredExpenseReversal	97000000.0	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	78000000.0	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	13600000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	358900000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	63400000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	61300000	USD
CY2020Q4	us-gaap	Inventory Gross InventoryGross	265600000	USD
CY2019Q4	us-gaap	Inventory Gross InventoryGross	235500000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	42000000.0	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	45000000.0	USD
CY2020	es	Fuel Power Costs FuelPowerCosts	464200000	USD
CY2019	es	Fuel Power Costs FuelPowerCosts	462100000	USD
CY2018	es	Fuel Power Costs FuelPowerCosts	442600000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	23700000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	25600000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	19700000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	44000000.0	USD
CY2020	es	Allowance For Funds Used During Construction AllowanceForFundsUsedDuringConstruction	65700000	USD
CY2019	es	Allowance For Funds Used During Construction AllowanceForFundsUsedDuringConstruction	70600000	USD
CY2018	es	Allowance For Funds Used During Construction AllowanceForFundsUsedDuringConstruction	63700000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.050
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.054
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.049
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	108600000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	132800000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	128400000	USD
CY2020	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	170600000	USD
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	163100000	USD
CY2018	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	161900000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	518000000.0	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	532400000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	503200000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	48900000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	56000000.0	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	158800000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	367200000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	379400000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	389300000	USD
CY2020Q4	us-gaap	Cash Cash	106600000	USD
CY2019Q4	us-gaap	Cash Cash	15400000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	265000000.0	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	117100000	USD
CY2020	es	Payments For Charitable Contributions Related Parties PaymentsForCharitableContributionsRelatedParties	6400000	USD
CY2019	es	Payments For Charitable Contributions Related Parties PaymentsForCharitableContributionsRelatedParties	0	USD
CY2018	es	Payments For Charitable Contributions Related Parties PaymentsForCharitableContributionsRelatedParties	0	USD
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	6569900000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	5514700000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	1076600000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	651100000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	5493300000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	4863600000	USD
CY2020Q4	us-gaap	Amount Of Regulatory Costs Not Yet Approved AmountOfRegulatoryCostsNotYetApproved	196900000	USD
CY2019Q4	us-gaap	Amount Of Regulatory Costs Not Yet Approved AmountOfRegulatoryCostsNotYetApproved	146000000.0	USD
CY2020Q4	es	Deferred Regulatory Costs Uncollectible Expenses Incurred DeferredRegulatoryCostsUncollectibleExpensesIncurred	15800000	USD
CY2020Q4	es	Deferred Regulatory Costs Facilities And Fleet Cleaning Sanitizing Costs And Supplies DeferredRegulatoryCostsFacilitiesAndFleetCleaningSanitizingCostsAndSupplies	8200000	USD
CY2020Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4240200000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4019200000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	389400000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	361200000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	3850800000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	3658000000.0	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	16703200000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	15880000000.0	USD
CY2020Q4	es	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	6111200000	USD
CY2019Q4	es	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	3931100000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	11954000000.0	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	10958400000	USD
CY2020Q4	es	Public Utilities Property Plant And Equipment Distribution Water PublicUtilitiesPropertyPlantAndEquipmentDistributionWater	1743100000	USD
CY2019Q4	es	Public Utilities Property Plant And Equipment Distribution Water PublicUtilitiesPropertyPlantAndEquipmentDistributionWater	1726500000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	201500000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	200200000	USD
CY2020Q4	es	Public Utilities Property Plant And Equipment Electric Natural Gasand Water Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricNaturalGasandWaterUtilityTotal	36713000000.0	USD
CY2019Q4	es	Public Utilities Property Plant And Equipment Electric Natural Gasand Water Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricNaturalGasandWaterUtilityTotal	32696200000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	1269000000.0	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	1025600000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	37982000000.0	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	33721800000	USD
CY2020Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Electric Natural Gasand Water Utility PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationElectricNaturalGasandWaterUtility	8476300000	USD
CY2019Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Electric Natural Gasand Water Utility PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationElectricNaturalGasandWaterUtility	7483500000	USD
CY2020Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Other PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationOther	477600000	USD
CY2019Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Other PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationOther	387400000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	8953900000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	7870900000	USD
CY2020Q4	es	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	29028100000	USD
CY2019Q4	es	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	25850900000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1854400000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1734600000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	30882500000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	27585500000	USD
CY2020	es	Gain Loss On Disposition Of Property Plant And Equipment Net Of Tax GainLossOnDispositionOfPropertyPlantAndEquipmentNetOfTax	3500000	USD
CY2020	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.030
CY2019	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.030
CY2018	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.029
CY2020	es	Distribution Assets Average Useful Life DistributionAssetsAverageUsefulLife	P34Y3M18D
CY2020	es	Distribution Natural Gas Useful Life DistributionNaturalGasUsefulLife	P41Y6M
CY2020	es	Transmission Assets Average Useful Life TransmissionAssetsAverageUsefulLife	P40Y8M12D
CY2020	es	Water Assets Average Useful Life WaterAssetsAverageUsefulLife	P34Y1M6D
CY2020	es	Generation Assets Average Useful Life GenerationAssetsAverageUsefulLife	P24Y3M18D
CY2020	es	Other Assets Average Useful Life OtherAssetsAverageUsefulLife	P11Y
CY2020	es	Percentageof Costsor Benefits Borne Under Capacity Related Contractsby United Illuminated Company PercentageofCostsorBenefitsBorneUnderCapacityRelatedContractsbyUnitedIlluminatedCompany	0.20
CY2020Q4	es	Amountof Capacity Provided Under Capacity Contract AmountofCapacityProvidedUnderCapacityContract	675	MW
CY2019Q4	es	Amountof Capacity Provided Under Capacity Contract AmountofCapacityProvidedUnderCapacityContract	676	MW
CY2020	es	Amountof Natural Gas To Be Purchased Under Futures Contracts AmountofNaturalGasToBePurchasedUnderFuturesContracts	8900000	MMBTU
CY2019	es	Amountof Natural Gas To Be Purchased Under Futures Contracts AmountofNaturalGasToBePurchasedUnderFuturesContracts	9600000	MMBTU
CY2020	es	Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetLiability	-21200000	USD
CY2019	es	Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetLiability	-20700000	USD
CY2018	es	Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetLiability	-25000000.0	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	40900000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	45700000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	213100000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	11200000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	224200000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	228400000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5800000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	234100000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	43600000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	43600000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	57400000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	59700000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	46600000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	49700000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	65500000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	71200000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	213100000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	224200000	USD
CY2020Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	470200000	USD
CY2019Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	462600000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1107100000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	871600000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	14200000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	42200000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3800000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	21800000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	48900000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	22300000	USD
CY2020	es	Numberof Companies That Transmit Hydro Electricity NumberofCompaniesThatTransmitHydroElectricity	2	company
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	489500000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	466200000	USD
CY2020	es	Asset Retirement Obligation Liabilities Assumed In Business Combination AssetRetirementObligationLiabilitiesAssumedInBusinessCombination	20100000	USD
CY2019Q4	es	Payment To Doe PaymentToDOE	29000000	USD
CY2020Q4	es	Interest Included In Payment To Settle Spent Nuclear Fuel Obligation InterestIncludedInPaymentToSettleSpentNuclearFuelObligation	8700000	USD
CY2019	es	Asset Retirement Obligation Liabilities Assumed In Business Combination AssetRetirementObligationLiabilitiesAssumedInBusinessCombination	0	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2100000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	30300000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	21800000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	21300000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	28900000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	27100000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-19100000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-12800000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	499700000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	489500000	USD
CY2020Q4	us-gaap	Longterm Commercial Paper Current And Noncurrent LongtermCommercialPaperCurrentAndNoncurrent	0	USD
CY2019Q4	us-gaap	Longterm Commercial Paper Current And Noncurrent LongtermCommercialPaperCurrentAndNoncurrent	346300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1175200000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1658200000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1049900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1400000000.0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	6700000	shares
CY2019Q4	es	Interest Included In Payment To Settle Spent Nuclear Fuel Obligation InterestIncludedInPaymentToSettleSpentNuclearFuelObligation	8600000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1022200000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	9807900000	USD
CY2020Q4	es	Longtermdebtmaturitiesrepaymentsofprincipaltotal Longtermdebtmaturitiesrepaymentsofprincipaltotal	16113400000	USD
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.07
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.07
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	49400000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	41600000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	38400000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2876601	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3302526	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	379258	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	62.99
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	33900000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	27300000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	21400000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8900000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7000000.0	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5400000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	19300000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y8M26D
CY2020	es	Effective Tax Rate Reconciliation Percent Tax Effecton Share Based Payments EffectiveTaxRateReconciliationPercentTaxEffectonShareBasedPayments	0.26
CY2020	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	6600000	USD
CY2019	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	1500000	USD
CY2018	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	1500000	USD
CY2020Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	45700000	USD
CY2019Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	52000000.0	USD
CY2018Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	49100000	USD
CY2020Q4	es	Deferred Compensation Cash Based Arrangements Expense Pertaining To Deferred Benefits DeferredCompensationCashBasedArrangementsExpensePertainingToDeferredBenefits	3300000	USD
CY2019Q4	es	Deferred Compensation Cash Based Arrangements Expense Pertaining To Deferred Benefits DeferredCompensationCashBasedArrangementsExpensePertainingToDeferredBenefits	2700000	USD
CY2018Q4	es	Deferred Compensation Cash Based Arrangements Expense Pertaining To Deferred Benefits DeferredCompensationCashBasedArrangementsExpensePertainingToDeferredBenefits	2700000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	73600000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	56900000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	106500000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	19100000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10500000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10600000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	92700000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	67400000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	117100000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	173500000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	138400000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	122600000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	83700000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	71400000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	52200000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	257200000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	209800000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	174800000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2900000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2900000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	346200000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	273500000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	289000000.0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1558900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1190100000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1329500000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	327400000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	249900000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	279200000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-11100000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	1900000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-30800000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	44400000	USD
CY2020	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	5100000	USD
CY2019	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	5100000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3700000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2900000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2900000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	44900000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	24600000	USD
CY2018	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	5100000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	33400000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	40100000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	5200000	USD
CY2020	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	6600000	USD
CY2019	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	1500000	USD
CY2018	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	1500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	2072400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1983700000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	8400000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	9900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	105000000.0	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.222
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-48700000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-37400000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-5000000.0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	15700000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	4700000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	5500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	346200000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	273500000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	289000000.0	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.230
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.217
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	602400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	509400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	92600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	259800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	267000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	87500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	56700000	USD
CY2020Q4	es	Deferred Tax Assets Tax Effect Tax Regulatory Liabilities DeferredTaxAssetsTaxEffectTaxRegulatoryLiabilities	810900000	USD
CY2019Q4	es	Deferred Tax Assets Tax Effect Tax Regulatory Liabilities DeferredTaxAssetsTaxEffectTaxRegulatoryLiabilities	830400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	12700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	9100000	USD
CY2020Q4	es	Deferred Tax Asset Purchase Accounting DeferredTaxAssetPurchaseAccounting	54500000	USD
CY2019Q4	es	Deferred Tax Asset Purchase Accounting DeferredTaxAssetPurchaseAccounting	58700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	200300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	190400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2120700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2026700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	48300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	43000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4153600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3901000000.0	USD
CY2020Q4	es	Deferred Tax Liabilities Resulting From Property Tax Accruals And Other DeferredTaxLiabilitiesResultingFromPropertyTaxAccrualsAndOther	88700000	USD
CY2019Q4	es	Deferred Tax Liabilities Resulting From Property Tax Accruals And Other DeferredTaxLiabilitiesResultingFromPropertyTaxAccrualsAndOther	76800000	USD
CY2020Q4	es	Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals DeferredTaxLiabilitiesRegulatoryAssetsOtherRegulatoryDeferrals	1376700000	USD
CY2019Q4	es	Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals DeferredTaxLiabilitiesRegulatoryAssetsOtherRegulatoryDeferrals	1155600000	USD
CY2020Q4	es	Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssetsTaxEffectTaxRegulatoryAssets	244600000	USD
CY2019Q4	es	Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssetsTaxEffectTaxRegulatoryAssets	238200000	USD
CY2020Q4	es	Deferred Tax Liabilities Goodwill Regulatory Asset DeferredTaxLiabilitiesGoodwillRegulatoryAsset	86000000.0	USD
CY2019Q4	es	Deferred Tax Liabilities Goodwill Regulatory Asset DeferredTaxLiabilitiesGoodwillRegulatoryAsset	90600000	USD
CY2020Q4	es	Deferred Tax Liabilities Regulatory Assets Derivative Assets DeferredTaxLiabilitiesRegulatoryAssetsDerivativeAssets	17800000	USD
CY2019Q4	es	Deferred Tax Liabilities Regulatory Assets Derivative Assets DeferredTaxLiabilitiesRegulatoryAssetsDerivativeAssets	19700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	200300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	257600000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6167700000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	5739500000	USD
CY2020Q4	es	Social Security Tax Employer Deferral Cares Act SocialSecurityTaxEmployerDeferralCARESAct	39000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	6500000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	8500000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	45900000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	51700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	12100000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	6400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	55000000.0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	11900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1400000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	6500000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	61800000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	1700000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	100000	USD
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	64700000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	26500000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	10200000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	81000000.0	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Acquisitions And Divestitures AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForAcquisitionsAndDivestitures	22900000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	102400000	USD
CY2020	es	Environmental Site Quantity EnvironmentalSiteQuantity	63	site
CY2019	es	Environmental Site Quantity EnvironmentalSiteQuantity	57	site
CY2020	es	Number Of Gas Sites Acquired NumberOfGasSitesAcquired	9	gasSite
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	1328800000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	1218600000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	1096100000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	1052300000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	1023000000.0	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	5451800000	USD
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	11170600000	USD
CY2020	es	Contractual Obligation Term Of Contract ContractualObligationTermOfContract	P20Y
CY2020	es	Unrecorded Unconditional Purchase Obligation Numberof Capacity Contractsfor Differences Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationNumberofCapacityContractsforDifferencesBetweenCLPandUnitedIlluminatedCompany	3	contract
CY2020	es	Unrecorded Unconditional Purchase Obligation Numberof Generation Projects Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationNumberofGenerationProjectsBetweenCLPandUnitedIlluminatedCompany	2	project
CY2020	es	Unrecorded Unconditional Purchase Obligation Numberof Demand Response Projects Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationNumberofDemandResponseProjectsBetweenCLPandUnitedIlluminatedCompany	1	project
CY2020Q4	es	Amountof Capacity Provided Under Capacity Contract AmountofCapacityProvidedUnderCapacityContract	675	MW
CY2019Q4	es	Amountof Capacity Provided Under Capacity Contract AmountofCapacityProvidedUnderCapacityContract	676	MW
CY2020	es	Percentageof Costsand Benefits Borne Under Unrecorded Unconditional Purchase Obligationby United Illuminated Company PercentageofCostsandBenefitsBorneUnderUnrecordedUnconditionalPurchaseObligationbyUnitedIlluminatedCompany	0.20
CY2020	es	Renewable Energy Costs Incurred RenewableEnergyCostsIncurred	584200000	USD
CY2019	es	Renewable Energy Costs Incurred RenewableEnergyCostsIncurred	320800000	USD
CY2018	es	Renewable Energy Costs Incurred RenewableEnergyCostsIncurred	218500000	USD
CY2020	es	Natural Gas Procurement Costs Incurred NaturalGasProcurementCostsIncurred	453400000	USD
CY2019	es	Natural Gas Procurement Costs Incurred NaturalGasProcurementCostsIncurred	448500000	USD
CY2018	es	Natural Gas Procurement Costs Incurred NaturalGasProcurementCostsIncurred	432400000	USD
CY2020	es	Supply And Stranded Costs Obligations Incurred SupplyAndStrandedCostsObligationsIncurred	62700000	USD
CY2019	es	Supply And Stranded Costs Obligations Incurred SupplyAndStrandedCostsObligationsIncurred	62100000	USD
CY2018	es	Supply And Stranded Costs Obligations Incurred SupplyAndStrandedCostsObligationsIncurred	72000000.0	USD
CY2020	es	Peaker Cfd Expense Incurred PeakerCfdExpenseIncurred	22700000	USD
CY2019	es	Peaker Cfd Expense Incurred PeakerCfdExpenseIncurred	13000000.0	USD
CY2018	es	Peaker Cfd Expense Incurred PeakerCfdExpenseIncurred	20900000	USD
CY2020	es	Transmission Support Commitment Costs Incurred TransmissionSupportCommitmentCostsIncurred	22100000	USD
CY2019	es	Transmission Support Commitment Costs Incurred TransmissionSupportCommitmentCostsIncurred	21800000	USD
CY2018	es	Transmission Support Commitment Costs Incurred TransmissionSupportCommitmentCostsIncurred	23400000	USD
CY2019Q2	us-gaap	Loss Contingency Damages Awarded Value LossContingencyDamagesAwardedValue	500000	USD
CY2019Q2	es	Loss Contingency Damages Sought Remaining Amount LossContingencyDamagesSoughtRemainingAmount	1000000	USD
CY2019Q3	us-gaap	Loss Contingency Damages Paid Value LossContingencyDamagesPaidValue	500000	USD
CY2019Q4	es	Proceeds From Payments For Items Related To Spent Nuclear Fuel ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel	29000000.0	USD
CY2020Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	500000	USD
CY2018Q4	es	Loss Contingency Percentage Of Base Roe Reasonably Justified LossContingencyPercentageOfBaseROEReasonablyJustified	0.1041
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CY2018Q4	es	Loss Contingency Percentage Of Base Roe Reasonably Justified LossContingencyPercentageOfBaseROEReasonablyJustified	0.1041
CY2016Q3	es	Capacity Required For Installationof Distribution Cable CapacityRequiredForInstallationofDistributionCable	115	kV
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2600000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1700000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1400000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1200000	USD
CY2020	es	Finance Lease Cost FinanceLeaseCost	4000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	62600000	USD
CY2018	us-gaap	Revenues Revenues	8448200000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1072000000.0	USD
CY2018	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	5676300000	USD
CY2019	es	Finance Lease Cost FinanceLeaseCost	2900000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	11100000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	11700000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	57800000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	60500000	USD
CY2020	us-gaap	Lease Cost LeaseCost	72900000	USD
CY2019	us-gaap	Lease Cost LeaseCost	75100000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10800000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	55200000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	9500000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	45700000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	55200000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	60500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	57600000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	62600000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	49900000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	8600000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	41300000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	49900000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	8200000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	8100000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	10500000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P17Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P12Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.040
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.039
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.029
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.040
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	10900000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1700000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2800000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	600000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	700000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	11400000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1200000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2600000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2900000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	2000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	11400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	7200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	9000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	6400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	4900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	4800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	4700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	36200000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	60700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	70900000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	88000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	15700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	25400000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	55200000	USD
CY2020	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-19200000	USD
CY2019	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-12100000	USD
CY2020	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-7900000	USD
CY2019	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-7000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11300000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5100000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	6000000.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	4400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	-200000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	7900000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	7000000.0	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	6600000	USD
CY2020	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-1800000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1205200000	USD
CY2020	es	Accounts Receivable Allowance For Credit Loss Increase From Business Combination AccountsReceivableAllowanceForCreditLossIncreaseFromBusinessCombination	24200000	USD
CY2020Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
CY2020Q4	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	4610000000	USD
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	357818402	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	345858402	shares
CY2020Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	6000000	shares
CY2020Q2	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	86.26
CY2020Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	509200000	USD
CY2019Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	5980000	shares
CY2019Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	5980000	shares
CY2020Q2	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	6000000	shares
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	929000000.0	USD
CY2020Q2	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	11960000	shares
CY2020Q2	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	11960000	shares
CY2019Q4	us-gaap	Forward Contract Indexed To Issuers Equity Forward Rate ForwardContractIndexedToIssuersEquityForwardRate	71.48
CY2020Q4	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	6000000	shares
CY2020Q1	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	1500000	shares
CY2020Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	105700000	USD
CY2020Q1	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	4460000	shares
CY2020Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	314100000	USD
CY2020Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	5960000	shares
CY2020Q4	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	6000000	shares
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	852300000	USD
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	14864379	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	15977757	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	342954023	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	329880645	shares
CY2020Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	155600000	USD
CY2019Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	155600000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	7500000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	7500000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	7500000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	155600000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	155600000	USD
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	39560	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1205200000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	909100000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1033000000.0	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	338836147	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	321416086	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317370369	shares
CY2020	es	Incremental Common Shares Attributable To Dilutive Effect Of Share Based Payment Arrangements And Other IncrementalCommonSharesAttributableToDilutiveEffectOfShareBasedPaymentArrangementsAndOther	738994	shares
CY2019	es	Incremental Common Shares Attributable To Dilutive Effect Of Share Based Payment Arrangements And Other IncrementalCommonSharesAttributableToDilutiveEffectOfShareBasedPaymentArrangementsAndOther	762215	shares
CY2018	es	Incremental Common Shares Attributable To Dilutive Effect Of Share Based Payment Arrangements And Other IncrementalCommonSharesAttributableToDilutiveEffectOfShareBasedPaymentArrangementsAndOther	623565	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	271921	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	763335	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1010915	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1525550	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	623565	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	339847062	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	322941636	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317993934	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.56
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.25
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.55
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.81
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.25
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	8766500000	USD
CY2020	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	130000000.0	USD
CY2020	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	7900000	USD
CY2020	us-gaap	Revenues Revenues	8904400000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	8450000000.0	USD
CY2019	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	53200000	USD
CY2019	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	23300000	USD
CY2019	us-gaap	Revenues Revenues	8526500000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	8472700000	USD
CY2018	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	-46100000	USD
CY2018	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	21600000	USD
CY2018	us-gaap	Revenues Revenues	8448200000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	4300000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	4400000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2020	us-gaap	Revenues Revenues	8904400000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1159100000	USD
CY2020	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	5756600000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	1988700000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	4800000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	103800000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	346200000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1212700000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2020Q4	us-gaap	Assets Assets	46099600000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2943000000.0	USD
CY2019	us-gaap	Revenues Revenues	8526500000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1080700000	USD
CY2019	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	239600000	USD
CY2019	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	5615700000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1590500000	USD
CY2019	us-gaap	Interest Expense InterestExpense	533200000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	12800000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	120000000.0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	273500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	916600000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	909100000	USD
CY2019Q4	us-gaap	Assets Assets	41123900000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2911500000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1699900000	USD
CY2018	us-gaap	Interest Expense InterestExpense	498800000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	18100000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	110300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	289000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1040500000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1033000000.0	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2569900000	USD
CY2020Q4	es	Number Of Natural Gas Customers NumberOfNaturalGasCustomers	303000	customer
CY2017	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	154800000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	13900000	USD
CY2020Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	4427000000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	42000000	USD
CY2020	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	23000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	4446000000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2876601	shares

Files In Submission

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$ES
EVERSOURCE ENERGY Stock $es

2019 Q4 Form 10-K Financial Statement

#000007274121000005 Filed on February 17, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ES EVERSOURCE ENERGY Stock $es

2019 Q4 Form 10-K Financial Statement

#000007274121000005 Filed on February 17, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ES
EVERSOURCE ENERGY Stock $es