$XEL
Xcel Energy Inc Stock $xel

$xel Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000007290319000010 Filed on February 22, 2019

Income Statement

Concept	2018 Q4	2018	2017 Q4
Revenue	$2.880B	$11.54B	$2.796B
YoY Change	3.0%	1.17%	0.04%
Cost Of Revenue	$313.0M	$3.854B	$287.0M
YoY Change	9.06%	2.58%	9.58%
Gross Profit	$2.567B	$7.683B	$2.508B
YoY Change	2.35%	0.47%	-0.98%
Gross Profit Margin	89.13%	66.59%	89.7%
Selling, General & Admin	$74.00M	$290.0M	$67.00M
YoY Change	10.45%	6.23%	-0.74%
% of Gross Profit	2.88%	3.77%	2.67%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$476.0M	$1.781B	$407.9M
YoY Change	16.7%	10.69%	12.21%
% of Gross Profit	18.54%	23.18%	16.26%
Operating Expenses	$2.226B	$8.694B	$2.067B
YoY Change	7.69%	4.44%	0.55%
Operating Profit	$339.0M	$1.965B	$440.0M
YoY Change	-22.95%	-11.61%	-5.38%
Interest Expense	-$113.0M	$700.0M	-$107.0M
YoY Change	5.61%	5.58%	-28.14%
% of Operating Profit	-33.33%	35.62%	-24.32%
Other Income/Expense, Net	-$20.00M	-$14.00M	-$27.00M
YoY Change	-25.93%	40.0%	-400.0%
Pretax Income	$208.0M	$1.442B	$307.0M
YoY Change	-32.25%	-14.67%	-8.96%
Income Tax	-$6.000M	$181.0M	$95.00M
% Of Pretax Income	-2.88%	12.55%	30.94%
Net Earnings	$214.0M	$1.261B	$189.0M
YoY Change	13.23%	9.84%	-16.74%
Net Earnings / Revenue	7.43%	10.93%	6.76%
Basic Earnings Per Share	$0.42	$2.47	$0.37
Diluted Earnings Per Share	$0.42	$2.47	$0.37
COMMON SHARES
Basic Shares Outstanding	513.8M shares	511.0M shares	507.8M shares
Diluted Shares Outstanding		511.0M shares

Balance Sheet

Concept	2018 Q4	2018	2017 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$147.0M	$147.0M	$83.00M
YoY Change	77.11%	77.11%	-1.19%
Cash & Equivalents	$147.0M	$147.0M	$83.00M
Short-Term Investments
Other Short-Term Assets	$1.539B	$1.539B	$1.483B
YoY Change	3.78%	3.78%	7.7%
Inventory	$548.0M	$548.0M	$610.0M
Prepaid Expenses
Receivables	$860.0M	$860.0M	$797.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.094B	$3.094B	$2.973B
YoY Change	4.07%	4.07%	4.61%
LONG-TERM ASSETS
Property, Plant & Equipment	$36.94B	$36.94B	$34.33B
YoY Change	7.62%	7.62%	4.53%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$141.0M	$141.0M	$140.0M
YoY Change	0.71%	0.71%	5.26%
Other Assets	$272.0M	$5.808B	$278.0M
YoY Change	-2.16%	3.94%	12.1%
Total Long-Term Assets	$42.89B	$42.89B	$40.06B
YoY Change	7.08%	7.08%	4.55%
TOTAL ASSETS
Total Short-Term Assets	$3.094B	$3.094B	$2.973B
Total Long-Term Assets	$42.89B	$42.89B	$40.06B
Total Assets	$45.99B	$45.99B	$43.03B
YoY Change	6.87%	6.87%	4.56%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.237B	$1.237B	$1.243B
YoY Change	-0.48%	-0.48%	18.95%
Accrued Expenses	$174.0M	$174.0M	$174.0M
YoY Change	0.0%	0.0%	0.58%
Deferred Revenue
YoY Change
Short-Term Debt	$1.038B	$1.038B	$814.0M
YoY Change	27.52%	27.52%	107.65%
Long-Term Debt Due	$406.0M	$406.0M	$457.0M
YoY Change	-11.16%	-11.16%	82.8%
Total Short-Term Liabilities	$4.460B	$4.460B	$4.088B
YoY Change	9.1%	9.1%	25.9%
LONG-TERM LIABILITIES
Long-Term Debt	$15.80B	$15.80B	$14.52B
YoY Change	8.84%	8.84%	2.29%
Other Long-Term Liabilities	$206.0M	$9.283B	$145.0M
YoY Change	42.07%	2.42%	-35.56%
Total Long-Term Liabilities	$206.0M	$25.09B	$145.0M
YoY Change	42.07%	6.37%	-35.56%
TOTAL LIABILITIES
Total Short-Term Liabilities	$4.460B	$4.460B	$4.088B
Total Long-Term Liabilities	$206.0M	$25.09B	$145.0M
Total Liabilities	$4.666B	$33.77B	$4.233B
YoY Change	10.23%	6.94%	21.92%
SHAREHOLDERS EQUITY
Retained Earnings	$4.893B		$4.413B
YoY Change	10.88%		10.82%
Common Stock	$7.453B		$7.167B
YoY Change	3.99%		0.25%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$12.22B	$12.22B	$11.46B
YoY Change
Total Liabilities & Shareholders Equity	$45.99B	$45.99B	$43.03B
YoY Change	6.87%	6.87%	4.56%

Cashflow Statement

Concept	2018 Q4	2018	2017 Q4
OPERATING ACTIVITIES
Net Income	$214.0M	$1.261B	$189.0M
YoY Change	13.23%	9.84%	-16.74%
Depreciation, Depletion And Amortization	$476.0M	$1.781B	$407.9M
YoY Change	16.7%	10.69%	12.21%
Cash From Operating Activities	$629.0M	$3.122B	$758.8M
YoY Change	-17.11%	-0.13%	18.67%
INVESTING ACTIVITIES
Capital Expenditures	-$1.197B	-$3.957B	-$1.063B
YoY Change	12.66%	19.22%	-0.62%
Acquisitions
YoY Change
Other Investing Activities	-$83.00M	$9.000M	$5.100M
YoY Change	-1727.45%	-62.5%	-63.31%
Cash From Investing Activities	-$1.280B	-$3.986B	-$1.057B
YoY Change	21.05%	20.93%	0.22%
FINANCING ACTIVITIES
Cash Dividend Paid		$730.0M
YoY Change		1.25%
Common Stock Issuance & Retirement, Net		-$229.0M
YoY Change		-7733.33%
Debt Paid & Issued, Net		$452.0M
YoY Change		-56.12%
Cash From Financing Activities	585.0M	$928.0M	213.2M
YoY Change	174.39%	452.38%	45.13%
NET CHANGE
Cash From Operating Activities	629.0M	$3.122B	758.8M
Cash From Investing Activities	-1.280B	-$3.986B	-1.057B
Cash From Financing Activities	585.0M	$928.0M	213.2M
Net Change In Cash	-66.00M	$64.00M	-85.40M
YoY Change	-22.72%	-3300.0%	-68.23%
FREE CASH FLOW
Cash From Operating Activities	$629.0M	$3.122B	$758.8M
Capital Expenditures	-$1.197B	-$3.957B	-$1.063B
Free Cash Flow	$1.826B	$7.079B	$1.821B
YoY Change	0.26%	9.84%	6.6%

Facts In Submission

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CY2017Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	3000000	USD
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CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.21
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CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.001
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CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.041
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CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	44000000	USD
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	38000000	USD
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CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	12000000	USD
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CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	140000000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	141000000	USD
CY2016Q4	us-gaap	Fair Value Hedges At Fair Value Net FairValueHedgesAtFairValueNet	0	USD
CY2017Q4	us-gaap	Fair Value Hedges At Fair Value Net FairValueHedgesAtFairValueNet	0	USD
CY2018Q4	us-gaap	Fair Value Hedges At Fair Value Net FairValueHedgesAtFairValueNet	0	USD
CY2018Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	12000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1704000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1690000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1442000000	USD
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CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	35000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	581000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	542000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	181000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-62000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-44000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-27000000	USD
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CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	105000000	USD
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CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	65000000	USD
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CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-9000000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-18000000	USD
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CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-61000000	USD
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CY2016	us-gaap	Interest And Debt Expense InterestAndDebtExpense	620000000	USD
CY2017	us-gaap	Interest And Debt Expense InterestAndDebtExpense	628000000	USD
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	652000000	USD
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CY2018	us-gaap	Interest Expense InterestExpense	700000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	592000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	616000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	633000000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	174000000	USD
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CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	45987000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	4088000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	4460000000	USD
CY2017Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	12967000000	USD
CY2018Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	13502000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	14520000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	15803000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	457000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	406000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	406000000	USD
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CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1257000000	USD
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CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	168000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	928000000	USD
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CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3986000000	USD
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CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3122000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	1123000000	USD
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CY2017	us-gaap	Net Income Loss NetIncomeLoss	1148000000	USD
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CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	265000000	USD
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CY2018	us-gaap	Net Income Loss NetIncomeLoss	1261000000	USD
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CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	492000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	466000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	824000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	440000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	2223000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	480000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	450000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	696000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	339000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1965000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	239000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	208000000	USD
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CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	234000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	1037000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	278000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	272000000	USD
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CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-5000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-2000000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	4000000	USD
CY2017	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	3000000	USD
CY2018	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	4000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	9000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	5000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	3000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-11000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	4000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-3000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-4000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-3000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-5000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-2000000	USD
CY2016	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	36000000	USD
CY2017	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	34000000	USD
CY2018	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	35000000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	501000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	463000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	145000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	206000000	USD
CY2017Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	114000000	USD
CY2018Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	121000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-18000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-10000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-14000000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-58000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-73000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-71000000	USD
CY2016	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	18000000	USD
CY2017	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	20000000	USD
CY2018	us-gaap	Other Postretirement Benefits Payments OtherPostretirementBenefitsPayments	11000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	24000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	32000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1000000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	681000000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	721000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	730000000	USD
CY2016	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	547000000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1697000000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	853000000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	3195000000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	3244000000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	3957000000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	1042000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	994000000	USD
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	183000000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	154000000	USD
CY2017Q4	us-gaap	Prepaid Taxes PrepaidTaxes	68000000	USD
CY2018Q4	us-gaap	Prepaid Taxes PrepaidTaxes	79000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	230000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2424000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1518000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1675000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-18000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-19000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-454000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	422000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	225000000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	479000000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1669000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	833000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	48927000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	52249000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	34329000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	36944000000	USD
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	39000000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	39000000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	42000000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	60000000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	75000000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	108000000	USD
CY2017Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	610000000	USD
CY2018Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	548000000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-7000000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-9000000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	424000000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	464000000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3005000000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3326000000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	239000000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	436000000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	5083000000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	5187000000	USD
CY2017Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	212000000	USD
CY2018Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	178000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1036000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1030000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	452000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4413000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	4893000000	USD
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11107000000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11404000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11537000000	USD
CY2016	us-gaap	Revenues Revenues	11107000000	USD
CY2017Q1	us-gaap	Revenues Revenues	2946000000	USD
CY2017Q2	us-gaap	Revenues Revenues	2645000000	USD
CY2017Q3	us-gaap	Revenues Revenues	3017000000	USD
CY2017Q4	us-gaap	Revenues Revenues	2796000000	USD
CY2017	us-gaap	Revenues Revenues	11404000000	USD
CY2018Q1	us-gaap	Revenues Revenues	2951000000	USD
CY2018Q2	us-gaap	Revenues Revenues	2658000000	USD
CY2018Q3	us-gaap	Revenues Revenues	3048000000	USD
CY2018Q4	us-gaap	Revenues Revenues	2880000000	USD
CY2018	us-gaap	Revenues Revenues	11537000000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	41000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	57000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	45000000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	126000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	41.74
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	522000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	503000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	500000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	36.00
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	41.02
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	47.60
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	995000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	939000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	38.48
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	44.30
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	530000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	467000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	475000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	21575000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	22459000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	23393000	USD
CY2018	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	35.92
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	814000000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	1038000000	USD
CY2016	us-gaap	Stock Issued1 StockIssued1	29000000	USD
CY2017	us-gaap	Stock Issued1 StockIssued1	31000000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	67000000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	16000000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	5000000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	270000000	USD
CY2016	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	32000000	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	3000000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	11455000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	12222000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	10601000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	11021000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	11455000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	12222000000	USD
CY2012	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	15000000	USD
CY2013	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	12000000	USD
CY2014	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	17000000	USD
CY2015	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	5000000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	532000000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	545000000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	556000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	121000000	USD
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	448000000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	450000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	134000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	39000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	37000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	4000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	4000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	105000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	7000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	5000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	6000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	10000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	15000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	20000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	28000000	USD
CY2016	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	1303000000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	1479000000	USD
CY2018	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	1642000000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	2300000000	USD
CY2017	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	2270000000	USD
CY2018	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	2352000000	USD
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	509000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	509000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	511000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	509000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	509000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	511000000	shares
CY2017Q4	xel	Accrued Unbilled Revenues AccruedUnbilledRevenues	764000000	USD
CY2018Q4	xel	Accrued Unbilled Revenues AccruedUnbilledRevenues	755000000	USD
CY2016	xel	Amortization And Adjustments To Deferred Income Taxes On Income Tax Regulatory Assets And Liabilities AmortizationAndAdjustmentsToDeferredIncomeTaxesOnIncomeTaxRegulatoryAssetsAndLiabilities	-45000000	USD
CY2017	xel	Amortization And Adjustments To Deferred Income Taxes On Income Tax Regulatory Assets And Liabilities AmortizationAndAdjustmentsToDeferredIncomeTaxesOnIncomeTaxRegulatoryAssetsAndLiabilities	3583000000	USD
CY2018	xel	Amortization And Adjustments To Deferred Income Taxes On Income Tax Regulatory Assets And Liabilities AmortizationAndAdjustmentsToDeferredIncomeTaxesOnIncomeTaxRegulatoryAssetsAndLiabilities	-102000000	USD
CY2018	xel	Approvedannualaccrualfordecommissioningcosts Approvedannualaccrualfordecommissioningcosts	14000000	USD
CY2017	xel	Assumed Annual Escalation Rate During Independent Fuel Storage Installation And Site Restoration Portion Of Decommissioning AssumedAnnualEscalationRateDuringIndependentFuelStorageInstallationAndSiteRestorationPortionOfDecommissioning	0.0336
CY2018	xel	Assumed Annual Escalation Rate During Independent Fuel Storage Installation And Site Restoration Portion Of Decommissioning AssumedAnnualEscalationRateDuringIndependentFuelStorageInstallationAndSiteRestorationPortionOfDecommissioning	0.0336
CY2017	xel	Assumed Annual Escalation Rate During Operations And Radiological Portion Of Decommissioning AssumedAnnualEscalationRateDuringOperationsAndRadiologicalPortionOfDecommissioning	0.0436
CY2018	xel	Assumed Annual Escalation Rate During Operations And Radiological Portion Of Decommissioning AssumedAnnualEscalationRateDuringOperationsAndRadiologicalPortionOfDecommissioning	0.0436
CY2017Q4	xel	Collateral Already Posted Adequate Assurance Clauses Aggregate Fair Value CollateralAlreadyPostedAdequateAssuranceClausesAggregateFairValue	0	USD
CY2018Q4	xel	Collateral Already Posted Adequate Assurance Clauses Aggregate Fair Value CollateralAlreadyPostedAdequateAssuranceClausesAggregateFairValue	0	USD
CY2016	xel	Conservation And Demand Side Management Program Expenses ConservationAndDemandSideManagementProgramExpenses	245000000	USD
CY2017	xel	Conservation And Demand Side Management Program Expenses ConservationAndDemandSideManagementProgramExpenses	273000000	USD
CY2018	xel	Conservation And Demand Side Management Program Expenses ConservationAndDemandSideManagementProgramExpenses	290000000	USD
CY2016	xel	Current Change In Unrecognized Tax Expense Benefit CurrentChangeInUnrecognizedTaxExpenseBenefit	6000000	USD
CY2017	xel	Current Change In Unrecognized Tax Expense Benefit CurrentChangeInUnrecognizedTaxExpenseBenefit	-83000000	USD
CY2018	xel	Current Change In Unrecognized Tax Expense Benefit CurrentChangeInUnrecognizedTaxExpenseBenefit	-6000000	USD
CY2017	xel	Doe Fuel Disposal Assessments Included In Fuel Expense DOEFuelDisposalAssessmentsIncludedInFuelExpense	0	USD
CY2016	xel	Deferred Change In Unrecognized Tax Expense Benefit DeferredChangeInUnrecognizedTaxExpenseBenefit	-2000000	USD
CY2017	xel	Deferred Change In Unrecognized Tax Expense Benefit DeferredChangeInUnrecognizedTaxExpenseBenefit	73000000	USD
CY2018	xel	Deferred Change In Unrecognized Tax Expense Benefit DeferredChangeInUnrecognizedTaxExpenseBenefit	11000000	USD
CY2016	xel	Deferred Investment Tax Credits DeferredInvestmentTaxCredits	5000000	USD
CY2017	xel	Deferred Investment Tax Credits DeferredInvestmentTaxCredits	5000000	USD
CY2018	xel	Deferred Investment Tax Credits DeferredInvestmentTaxCredits	5000000	USD
CY2017Q4	xel	Deferred Tax Assets Deferred Investment Tax Credits DeferredTaxAssetsDeferredInvestmentTaxCredits	17000000	USD
CY2018Q4	xel	Deferred Tax Assets Deferred Investment Tax Credits DeferredTaxAssetsDeferredInvestmentTaxCredits	16000000	USD
CY2017Q4	xel	Deferred Tax Assets Rate Refund DeferredTaxAssetsRateRefund	10000000	USD
CY2018Q4	xel	Deferred Tax Assets Rate Refund DeferredTaxAssetsRateRefund	60000000	USD
CY2017Q4	xel	Deferred Tax Assets Regulatory Liabilities DeferredTaxAssetsRegulatoryLiabilities	886000000	USD
CY2018Q4	xel	Deferred Tax Assets Regulatory Liabilities DeferredTaxAssetsRegulatoryLiabilities	879000000	USD
CY2017Q4	xel	Deferred Tax Assets Tax Credit Carryforward DeferredTaxAssetsTaxCreditCarryforward	607000000	USD
CY2018Q4	xel	Deferred Tax Assets Tax Credit Carryforward DeferredTaxAssetsTaxCreditCarryforward	642000000	USD
CY2016	xel	Deferred Tax Expense Benefit Excluding Selected Items DeferredTaxExpenseBenefitExcludingSelectedItems	631000000	USD
CY2017	xel	Deferred Tax Expense Benefit Excluding Selected Items DeferredTaxExpenseBenefitExcludingSelectedItems	-2939000000	USD
CY2018	xel	Deferred Tax Expense Benefit Excluding Selected Items DeferredTaxExpenseBenefitExcludingSelectedItems	320000000	USD
CY2017Q4	xel	Deferred Tax Liabilities Compensationand Benefits Employee Benefits DeferredTaxLiabilitiesCompensationandBenefitsEmployeeBenefits	199000000	USD
CY2018Q4	xel	Deferred Tax Liabilities Compensationand Benefits Employee Benefits DeferredTaxLiabilitiesCompensationandBenefitsEmployeeBenefits	178000000	USD
CY2016	xel	Depreciation Expense Expressed As Percentage Of Average Depreciable Property DepreciationExpenseExpressedAsPercentageOfAverageDepreciableProperty	0.029
CY2017	xel	Depreciation Expense Expressed As Percentage Of Average Depreciable Property DepreciationExpenseExpressedAsPercentageOfAverageDepreciableProperty	0.031
CY2018	xel	Depreciation Expense Expressed As Percentage Of Average Depreciable Property DepreciationExpenseExpressedAsPercentageOfAverageDepreciableProperty	0.031
CY2017Q4	xel	Derivative Gross Liability Position Aggregate Fair Value DerivativeGrossLiabilityPositionAggregateFairValue	0	USD
CY2018Q4	xel	Derivative Gross Liability Position Aggregate Fair Value DerivativeGrossLiabilityPositionAggregateFairValue	0	USD
CY2017Q4	xel	Differencesin Cost Studies DifferencesinCostStudies	-489000000	USD
CY2018Q4	xel	Differencesin Cost Studies DifferencesinCostStudies	0	USD
CY2017Q4	xel	Differencesin Discount Rateand Market Risk Premium DifferencesinDiscountRateandMarketRiskPremium	1403000000	USD
CY2018Q4	xel	Differencesin Discount Rateand Market Risk Premium DifferencesinDiscountRateandMarketRiskPremium	1447000000	USD
CY2017Q4	xel	Discounted Decommissioning Cost Obligation DiscountedDecommissioningCostObligation	4807000000	USD
CY2018Q4	xel	Discounted Decommissioning Cost Obligation DiscountedDecommissioningCostObligation	4294000000	USD
CY2017Q4	xel	Discounted Decommissioning Obligation Compared To Assets Currently Held In Trust DiscountedDecommissioningObligationComparedToAssetsCurrentlyHeldInTrust	2664000000	USD
CY2018Q4	xel	Discounted Decommissioning Obligation Compared To Assets Currently Held In Trust DiscountedDecommissioningObligationComparedToAssetsCurrentlyHeldInTrust	2239000000	USD
CY2017Q4	xel	Effect Of Discounting Obligation Using Risk Free Interest Rate EffectOfDiscountingObligationUsingRiskFreeInterestRate	6398000000	USD
CY2018Q4	xel	Effect Of Discounting Obligation Using Risk Free Interest Rate EffectOfDiscountingObligationUsingRiskFreeInterestRate	6911000000	USD
CY2017Q4	xel	Effect Of Escalating Costs To Current Year Dollars EffectOfEscalatingCostsToCurrentYearDollars	396000000	USD
CY2018Q4	xel	Effect Of Escalating Costs To Current Year Dollars EffectOfEscalatingCostsToCurrentYearDollars	539000000	USD
CY2017Q4	xel	Effect Of Escalating Costs To Payment Date EffectOfEscalatingCostsToPaymentDate	7797000000	USD
CY2018Q4	xel	Effect Of Escalating Costs To Payment Date EffectOfEscalatingCostsToPaymentDate	7654000000	USD
CY2016	xel	Effective Income Tax Rate Reconciliation Change In Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits	0.002
CY2017	xel	Effective Income Tax Rate Reconciliation Change In Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits	-0.006
CY2018	xel	Effective Income Tax Rate Reconciliation Change In Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefits	0.004
CY2016	xel	Effective Income Tax Rate Reconciliation Other Regulatory Items Percent EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent	-0.005
CY2017	xel	Effective Income Tax Rate Reconciliation Other Regulatory Items Percent EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent	-0.007
CY2018	xel	Effective Income Tax Rate Reconciliation Other Regulatory Items Percent EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent	-0.010
CY2016	xel	Effective Income Tax Rate Reconciliation Regulatory Differences Utility Plant Items EffectiveIncomeTaxRateReconciliationRegulatoryDifferencesUtilityPlantItems	-0.008
CY2017	xel	Effective Income Tax Rate Reconciliation Regulatory Differences Utility Plant Items EffectiveIncomeTaxRateReconciliationRegulatoryDifferencesUtilityPlantItems	-0.010
CY2018	xel	Effective Income Tax Rate Reconciliation Regulatory Differences Utility Plant Items EffectiveIncomeTaxRateReconciliationRegulatoryDifferencesUtilityPlantItems	-0.020
CY2016	xel	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Changein Tax Rate Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017ChangeinTaxRatePercent	0.000
CY2017	xel	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Changein Tax Rate Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017ChangeinTaxRatePercent	0.000
CY2018	xel	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Changein Tax Rate Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017ChangeinTaxRatePercent	0.006
CY2017Q4	xel	Estimated Decommissioning Cost Obligation From Most Recently Approved Study EstimatedDecommissioningCostObligationFromMostRecentlyApprovedStudy	3012000000	USD
CY2018Q4	xel	Estimated Decommissioning Cost Obligation From Most Recently Approved Study EstimatedDecommissioningCostObligationFromMostRecentlyApprovedStudy	3012000000	USD
CY2017Q4	xel	Estimated Decommissioning Cost Obligation In Current Dollars EstimatedDecommissioningCostObligationInCurrentDollars	3408000000	USD
CY2018Q4	xel	Estimated Decommissioning Cost Obligation In Current Dollars EstimatedDecommissioningCostObligationInCurrentDollars	3551000000	USD
CY2017Q4	xel	Estimated Future Decommissioning Costs Undiscounted EstimatedFutureDecommissioningCostsUndiscounted	11205000000	USD
CY2018Q4	xel	Estimated Future Decommissioning Costs Undiscounted EstimatedFutureDecommissioningCostsUndiscounted	11205000000	USD
CY2018	xel	Expense Relatedto Revaluationof Federal Benefit Tcja ExpenseRelatedtoRevaluationofFederalBenefitTCJA	14000000	USD
CY2016	xel	Gain Loss On Hedging And Derivative Transactions GainLossOnHedgingAndDerivativeTransactions	-8000000	USD
CY2017	xel	Gain Loss On Hedging And Derivative Transactions GainLossOnHedgingAndDerivativeTransactions	-2000000	USD
CY2018	xel	Gain Loss On Hedging And Derivative Transactions GainLossOnHedgingAndDerivativeTransactions	-22000000	USD
CY2018Q4	xel	Guarantee Current Exposure GuaranteeCurrentExposure	0	USD
CY2016	xel	Interest Expense Incomerelatedtounrecognizedtaxbenefits InterestExpenseIncomerelatedtounrecognizedtaxbenefits	-3000000	USD
CY2017	xel	Interest Expense Incomerelatedtounrecognizedtaxbenefits InterestExpenseIncomerelatedtounrecognizedtaxbenefits	3000000	USD
CY2018	xel	Interest Expense Incomerelatedtounrecognizedtaxbenefits InterestExpenseIncomerelatedtounrecognizedtaxbenefits	0	USD
CY2016	xel	Inventorytransferstoplantpropertyandequipment Inventorytransferstoplantpropertyandequipment	107000000	USD
CY2017	xel	Inventorytransferstoplantpropertyandequipment Inventorytransferstoplantpropertyandequipment	63000000	USD
CY2018	xel	Inventorytransferstoplantpropertyandequipment Inventorytransferstoplantpropertyandequipment	129000000	USD
CY2018	xel	Maximum Number Of Months Following End Of Annual Period In Which Revenues Are Earned To Be Included In Incentive Programs MaximumNumberOfMonthsFollowingEndOfAnnualPeriodInWhichRevenuesAreEarnedToBeIncludedInIncentivePrograms	P24M
CY2018	xel	Maximum Number Of Months Of Remaining Maturity At Time Of Purchase To Consider Investments In Certain Instruments As Cash Equivalents MaximumNumberOfMonthsOfRemainingMaturityAtTimeOfPurchaseToConsiderInvestmentsInCertainInstrumentsAsCashEquivalents	P3M
CY2018	xel	Minimum Amount Of Time Between Nuclear Decommissioning Studies In Years MinimumAmountOfTimeBetweenNuclearDecommissioningStudiesInYears	P3Y
CY2017Q4	xel	Net Deferred Tax Liabilityassociatedwiththe Unrecognized Tax Benefit Amountsand Related No Lsand Tax Credit Carryforwards NetDeferredTaxLiabilityassociatedwiththeUnrecognizedTaxBenefitAmountsandRelatedNOLsandTaxCreditCarryforwards	-13000000	USD
CY2018Q4	xel	Net Deferred Tax Liabilityassociatedwiththe Unrecognized Tax Benefit Amountsand Related No Lsand Tax Credit Carryforwards NetDeferredTaxLiabilityassociatedwiththeUnrecognizedTaxBenefitAmountsandRelatedNOLsandTaxCreditCarryforwards	-24000000	USD
CY2016	xel	Nuclear Decommissioning Expense NuclearDecommissioningExpense	20000000	USD
CY2017	xel	Nuclear Decommissioning Expense NuclearDecommissioningExpense	20000000	USD
CY2018	xel	Nuclear Decommissioning Expense NuclearDecommissioningExpense	20000000	USD
CY2016	xel	Nuclear Fuel Amortization NuclearFuelAmortization	117000000	USD
CY2017	xel	Nuclear Fuel Amortization NuclearFuelAmortization	114000000	USD
CY2018	xel	Nuclear Fuel Amortization NuclearFuelAmortization	122000000	USD
CY2018	xel	Number Of Years Of Tax Loss Carryback Period NumberOfYearsOfTaxLossCarrybackPeriod	two
CY2018	xel	Numberof Utilitiesin Peer Group NumberofUtilitiesinPeerGroup	22	Parties
CY2018	xel	Operating Lease Purchase Power Agreement Expiration OperatingLeasePurchasePowerAgreementExpiration	2034
CY2017Q4	xel	Operatingand Maintenance Costs Not Includedfor Gaap OperatingandMaintenanceCostsNotIncludedforGAAP	1041000000	USD
CY2018Q4	xel	Operatingand Maintenance Costs Not Includedfor Gaap OperatingandMaintenanceCostsNotIncludedforGAAP	879000000	USD
CY2017Q4	xel	Other Assets Excluding Property Plant And Equipment OtherAssetsExcludingPropertyPlantAndEquipment	5728000000	USD
CY2018Q4	xel	Other Assets Excluding Property Plant And Equipment OtherAssetsExcludingPropertyPlantAndEquipment	5949000000	USD
CY2018Q4	xel	Percentage Of Total Obligation For Decommissioning Expected To Be Funded By External Funds PercentageOfTotalObligationForDecommissioningExpectedToBeFundedByExternalFunds	1
CY2016	xel	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Debt PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt	27000000	USD
CY2017	xel	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Debt PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt	35000000	USD
CY2018	xel	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Debt PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt	48000000	USD
CY2018	xel	Reduced Expense Relatedto Revaluationof Federal Benefits Tcja ReducedExpenseRelatedtoRevaluationofFederalBenefitsTCJA	4000000	USD
CY2018	xel	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalent In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDividendEquivalentInPeriodWeightedAverageGrantDateFairValue	40.74
CY2018	xel	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Dividend Equivalents In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDividendEquivalentsInPeriod	45000	shares
CY2016	xel	Tcja2017 Reclassificationfrom Aoc Ito Retained Earnings TCJA2017ReclassificationfromAOCItoRetainedEarnings	0	USD
CY2017	xel	Tcja2017 Reclassificationfrom Aoc Ito Retained Earnings TCJA2017ReclassificationfromAOCItoRetainedEarnings	-10000000	USD
CY2018	xel	Tcja2017 Reclassificationfrom Aoc Ito Retained Earnings TCJA2017ReclassificationfromAOCItoRetainedEarnings	0	USD
CY2017Q4	xel	Tax Benefits Associated With Nol And Tax Credit Carryforwards TaxBenefitsAssociatedWithNolAndTaxCreditCarryforwards	31000000	USD
CY2018Q4	xel	Tax Benefits Associated With Nol And Tax Credit Carryforwards TaxBenefitsAssociatedWithNolAndTaxCreditCarryforwards	35000000	USD
CY2017Q4	xel	Tax Cutsand Jobs Actof2017 Corporate Federal Tax Rate TaxCutsandJobsActof2017CorporateFederalTaxRate	0.21
CY2018	xel	Tax Cutsand Jobs Actof2017 Corporate Federal Tax Rate TaxCutsandJobsActof2017CorporateFederalTaxRate	0.21
CY2017	xel	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Regulatory Liability Customer Refunds Weighted Average Period TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateRegulatoryLiabilityCustomerRefundsWeightedAveragePeriod	P30Y
CY2017	xel	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Regulatory Liability Provisional Income Tax Expense Benefit Gross TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateRegulatoryLiabilityProvisionalIncomeTaxExpenseBenefitGross	3800000000	USD
CY2017	xel	Tax Cutsand Jobs Actof2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	23000000	USD
CY2018	xel	Tax Cutsand Jobs Actof2017 Net Operating Loss Deduction Limitation Percentof Taxableincome TaxCutsandJobsActof2017NetOperatingLossDeductionLimitationPercentofTaxableincome	0.8
CY2017	xel	Tax Cutsand Jobs Actof2017 Reclassificationfrom Aoc Ito Retained Earnings TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarnings	0	USD
CY2017Q4	xel	Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate	19000000	USD
CY2018Q4	xel	Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate	9000000	USD
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:6px;text-align:justify;font-size:10pt;"><font style="font-family:Arial Narrow;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates </font><font style="font-family:Arial Narrow;font-size:10pt;font-style:italic;">—</font><font style="font-family:Arial Narrow;font-size:10pt;"> Xcel Energy uses estimates based on the best information available in recording transactions and balances resulting from business operations. Estimates are used on items such as plant depreciable lives or potential disallowances, AROs, certain regulatory assets and liabilities, tax provisions, uncollectible amounts, environmental costs, unbilled revenues, jurisdictional fuel and energy cost allocations and actuarially determined benefit costs. Recorded estimates are revised when better information becomes available or actual amounts can be determined. Revisions can affect operating results.</font></div></div>
CY2018	xel	Reconciliationof Decommissioning Cost Obligation Regulatoryto Gaap ReconciliationofDecommissioningCostObligationRegulatorytoGAAP	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:6px;text-align:justify;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:70%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:12%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:12%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">(Millions of Dollars)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">2018</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="text-align:center;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">2017</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">Discounted decommissioning cost obligation - regulated basis</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#e0e0e0;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">4,294</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#e0e0e0;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">4,807</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">Differences in discount rate and market risk premium</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(1,447</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(1,403</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">O&M costs not included for GAAP</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(879</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">)</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(1,041</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">ARO differences between 2017 and 2014 cost studies</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">—</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">(489</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">Nuclear production decommissioning ARO - GAAP</font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#e0e0e0;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#e0e0e0;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">1,968</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#e0e0e0;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#e0e0e0;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#e0e0e0;" rowspan="1" colspan="1"><div style="text-align:left;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#e0e0e0;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:right;font-size:8pt;"><font style="font-family:Arial Narrow;font-size:8pt;">1,874</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#e0e0e0;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div></div>

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