$CNP
CENTERPOINT ENERGY INC Stock $cnp

$cnp Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000113031019000016 Filed on February 28, 2019

Income Statement

Concept	2018 Q4	2018	2017 Q4
Revenue	$1.666B	$6.277B	$2.638B
YoY Change	-36.85%	10.14%	26.77%
Cost Of Revenue		$40.00M
YoY Change		21.21%
Gross Profit		$6.237B
YoY Change		10.08%
Gross Profit Margin		99.36%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$261.0M	$1.230B	$287.0M
YoY Change	-9.06%	20.59%	13.44%
% of Gross Profit		19.72%
Operating Expenses	-$1.480B	$5.409B	$2.330B
YoY Change	-163.52%	-36.2%	26.77%
Operating Profit	$192.0M	$868.0M	$308.0M
YoY Change	-37.66%	-13.46%	26.75%
Interest Expense	$4.000M	$361.0M	$88.00M
YoY Change	-95.45%	15.34%	-138.26%
% of Operating Profit	2.08%	41.59%	28.57%
Other Income/Expense, Net	$10.00M	-$317.0M	-$110.0M
YoY Change	-109.09%	334.25%	-173.83%
Pretax Income	$218.0M	$551.0M	$286.0M
YoY Change	-23.78%	-40.75%	76.54%
Income Tax	$70.00M	$155.0M	$103.0M
% Of Pretax Income	32.11%	28.13%	36.01%
Net Earnings	$120.0M	$368.0M	$1.296B
YoY Change	-90.74%	-79.46%	1183.17%
Net Earnings / Revenue	7.2%	5.86%	49.13%
Basic Earnings Per Share	$0.18	$0.74	$3.01
Diluted Earnings Per Share	$0.18	$0.74	$2.99
COMMON SHARES
Basic Shares Outstanding	501.2M shares	448.8M shares	431.0M shares
Diluted Shares Outstanding		452.5M shares

Balance Sheet

Concept	2018 Q4	2018	2017 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.771B	$4.771B	$1.220B
YoY Change	291.07%	291.07%	-5.72%
Cash & Equivalents	$4.231B	$4.231B	$260.0M
Short-Term Investments	$540.0M	$540.0M	$960.0M
Other Short-Term Assets	$670.0M	$670.0M	$778.0M
YoY Change	-13.88%	-13.88%	42.23%
Inventory	$394.0M	$394.0M	$397.0M
Prepaid Expenses
Receivables	$586.0M	$1.190B	$1.000B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$7.108B	$7.025B	$3.395B
YoY Change	109.37%	106.92%	16.15%
LONG-TERM ASSETS
Property, Plant & Equipment	$14.02B	$14.04B	$13.06B
YoY Change	7.4%	7.56%	6.09%
Goodwill	$757.0M		$867.0M
YoY Change	-12.69%		0.58%
Intangibles	$65.00M
YoY Change
Long-Term Investments	$2.482B	$2.845B	$2.472B
YoY Change	0.4%	0.35%	-1.32%
Other Assets	$159.0M	$2.163B	$191.0M
YoY Change	-16.75%	-16.23%	10.4%
Total Long-Term Assets	$19.99B	$19.98B	$19.34B
YoY Change	3.33%	3.32%	2.3%
TOTAL ASSETS
Total Short-Term Assets	$7.108B	$7.025B	$3.395B
Total Long-Term Assets	$19.99B	$19.98B	$19.34B
Total Assets	$27.09B	$27.01B	$22.74B
YoY Change	19.16%	18.79%	4.16%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$761.0M	$1.240B	$963.0M
YoY Change	-20.98%	28.76%	46.58%
Accrued Expenses	$121.0M	$121.0M	$104.0M
YoY Change	16.35%	16.35%	-3.7%
Deferred Revenue	$84.00M
YoY Change
Short-Term Debt	$0.00	$0.00	$39.00M
YoY Change	-100.0%	-100.0%	11.43%
Long-Term Debt Due	$482.0M	$482.0M	$606.0M
YoY Change	-20.46%	-20.46%	-40.88%
Total Short-Term Liabilities	$3.385B	$3.302B	$3.069B
YoY Change	10.3%	7.59%	-0.36%
LONG-TERM LIABILITIES
Long-Term Debt	$8.682B	$8.682B	$8.195B
YoY Change	5.94%	5.94%	8.8%
Other Long-Term Liabilities	$403.0M	$3.728B	$357.0M
YoY Change	12.89%	3.27%	28.42%
Total Long-Term Liabilities	$9.085B	$12.41B	$8.552B
YoY Change	6.23%	5.12%	9.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.385B	$3.302B	$3.069B
Total Long-Term Liabilities	$9.085B	$12.41B	$8.552B
Total Liabilities	$12.47B	$18.95B	$11.62B
YoY Change	7.31%	5.0%	6.71%
SHAREHOLDERS EQUITY
Retained Earnings	$349.0M		$543.0M
YoY Change	-35.73%		-181.29%
Common Stock	$5.000M		$4.000M
YoY Change	25.0%		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$8.058B	$8.058B	$4.688B
YoY Change
Total Liabilities & Shareholders Equity	$27.09B	$27.01B	$22.74B
YoY Change	19.16%	18.79%	4.16%

Cashflow Statement

Concept	2018 Q4	2018	2017 Q4
OPERATING ACTIVITIES
Net Income	$120.0M	$368.0M	$1.296B
YoY Change	-90.74%	-79.46%	1183.17%
Depreciation, Depletion And Amortization	$261.0M	$1.230B	$287.0M
YoY Change	-9.06%	20.59%	13.44%
Cash From Operating Activities	$457.0M	$2.136B	$389.0M
YoY Change	17.48%	50.74%	-17.41%
INVESTING ACTIVITIES
Capital Expenditures	-$530.0M	-$1.651B	-$432.0M
YoY Change	22.69%	15.78%	17.71%
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	-$3.000M	-$16.00M	$72.00M
YoY Change	-104.17%	300.0%	0.0%
Cash From Investing Activities	-$533.0M	-$1.207B	-$360.0M
YoY Change	48.06%	-3.98%	22.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$1.844B
YoY Change
Debt Paid & Issued, Net		$484.0M
YoY Change		-60.03%
Cash From Financing Activities	4.023B	$3.053B	34.00M
YoY Change	11732.35%	-1346.12%	-133.66%
NET CHANGE
Cash From Operating Activities	457.0M	$2.136B	389.0M
Cash From Investing Activities	-533.0M	-$1.207B	-360.0M
Cash From Financing Activities	4.023B	$3.053B	34.00M
Net Change In Cash	3.947B	$3.982B	63.00M
YoY Change	6165.08%	-4784.71%	-16.0%
FREE CASH FLOW
Cash From Operating Activities	$457.0M	$2.136B	$389.0M
Capital Expenditures	-$530.0M	-$1.651B	-$432.0M
Free Cash Flow	$987.0M	$3.787B	$821.0M
YoY Change	20.22%	33.2%	-2.03%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016	cnp	Amount Of Allowed Equity Return Recognized In Period AmountOfAllowedEquityReturnRecognizedInPeriod	64000000	USD
CY2017	cnp	Amount Of Allowed Equity Return Recognized In Period AmountOfAllowedEquityReturnRecognizedInPeriod	42000000	USD
CY2018	cnp	Amount Of Allowed Equity Return Recognized In Period AmountOfAllowedEquityReturnRecognizedInPeriod	74000000	USD
CY2017Q4	cnp	Assets Noncurrent Other Than Property Plant And Equipment AssetsNoncurrentOtherThanPropertyPlantAndEquipment	6284000000	USD
CY2018Q4	cnp	Assets Noncurrent Other Than Property Plant And Equipment AssetsNoncurrentOtherThanPropertyPlantAndEquipment	5940000000	USD
CY2016	cnp	Capital Expendituresfor Long Lived Assets CapitalExpendituresforLongLivedAssets	1406000000	USD
CY2017	cnp	Capital Expendituresfor Long Lived Assets CapitalExpendituresforLongLivedAssets	1494000000	USD
CY2018	cnp	Capital Expendituresfor Long Lived Assets CapitalExpendituresforLongLivedAssets	1720000000	USD
CY2016	cnp	Comprehensive Income Netof Tax Before Preferred Stock Div ComprehensiveIncomeNetofTaxBeforePreferredStockDiv	427000000	USD
CY2017	cnp	Comprehensive Income Netof Tax Before Preferred Stock Div ComprehensiveIncomeNetofTaxBeforePreferredStockDiv	1795000000	USD
CY2018	cnp	Comprehensive Income Netof Tax Before Preferred Stock Div ComprehensiveIncomeNetofTaxBeforePreferredStockDiv	343000000	USD
CY2017Q4	cnp	Cumulative Preferred Stock CumulativePreferredStock	0	USD
CY2018Q4	cnp	Cumulative Preferred Stock CumulativePreferredStock	0	USD
CY2017Q4	cnp	Deferred Tax Assets Noncurrent Other DeferredTaxAssetsNoncurrentOther	16000000	USD
CY2018Q4	cnp	Deferred Tax Assets Noncurrent Other DeferredTaxAssetsNoncurrentOther	29000000	USD
CY2017Q4	cnp	Deferred Tax Liabilities Noncurrent Other DeferredTaxLiabilitiesNoncurrentOther	127000000	USD
CY2018Q4	cnp	Deferred Tax Liabilities Noncurrent Other DeferredTaxLiabilitiesNoncurrentOther	131000000	USD
CY2018	cnp	Defined Benefit Pension Plan Vesting Period DefinedBenefitPensionPlanVestingPeriod	P3Y
CY2018	cnp	Defined Benefit Plan Percentage Vested DefinedBenefitPlanPercentageVested	1.00
CY2018Q4	cnp	Defined Benefit Plan Retirement Benefit Eligible Earnings Percentage DefinedBenefitPlanRetirementBenefitEligibleEarningsPercentage	0.05
CY2016	cnp	Derivative Income Loss DerivativeIncomeLoss	1812000000	USD
CY2017	cnp	Derivative Income Loss DerivativeIncomeLoss	3568000000	USD
CY2018	cnp	Derivative Income Loss DerivativeIncomeLoss	4024000000	USD
CY2016	cnp	Distribution To Zens Holders DistributionToZENSHolders	178000000	USD
CY2017	cnp	Distribution To Zens Holders DistributionToZENSHolders	0	USD
CY2018	cnp	Distribution To Zens Holders DistributionToZENSHolders	398000000	USD
CY2016	cnp	Gain Loss On Indexed Debt Securities GainLossOnIndexedDebtSecurities	-413000000	USD
CY2017	cnp	Gain Loss On Indexed Debt Securities GainLossOnIndexedDebtSecurities	49000000	USD
CY2018	cnp	Gain Loss On Indexed Debt Securities GainLossOnIndexedDebtSecurities	-232000000	USD
CY2016	cnp	Income Tax Reconciliation Change In Tax Expense IncomeTaxReconciliationChangeInTaxExpense	14000000	USD
CY2017	cnp	Income Tax Reconciliation Change In Tax Expense IncomeTaxReconciliationChangeInTaxExpense	-1101000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6000000	USD
CY2016	cnp	Increase Decrease Interest And Taxes Accrued IncreaseDecreaseInterestAndTaxesAccrued	5000000	USD
CY2017	cnp	Increase Decrease Interest And Taxes Accrued IncreaseDecreaseInterestAndTaxesAccrued	5000000	USD
CY2018	cnp	Income Tax Reconciliation Change In Tax Expense IncomeTaxReconciliationChangeInTaxExpense	38000000	USD
CY2018	cnp	Increase Decrease Interest And Taxes Accrued IncreaseDecreaseInterestAndTaxesAccrued	40000000	USD
CY2017Q4	cnp	Indexed Debt Current IndexedDebtCurrent	122000000	USD
CY2018Q4	cnp	Indexed Debt Current IndexedDebtCurrent	24000000	USD
CY2017Q4	cnp	Indexed Debt Securities Derivative IndexedDebtSecuritiesDerivative	668000000	USD
CY2018Q4	cnp	Indexed Debt Securities Derivative IndexedDebtSecuritiesDerivative	601000000	USD
CY2016	cnp	Indexed Debt Securities Gain Loss IndexedDebtSecuritiesGainLoss	-413000000	USD
CY2017	cnp	Indexed Debt Securities Gain Loss IndexedDebtSecuritiesGainLoss	49000000	USD
CY2018	cnp	Indexed Debt Securities Gain Loss IndexedDebtSecuritiesGainLoss	-232000000	USD
CY2016	cnp	Interest On Transition And System Restoration Bonds InterestOnTransitionAndSystemRestorationBonds	91000000	USD
CY2017	cnp	Interest On Transition And System Restoration Bonds InterestOnTransitionAndSystemRestorationBonds	77000000	USD
CY2018	cnp	Interest On Transition And System Restoration Bonds InterestOnTransitionAndSystemRestorationBonds	59000000	USD
CY2018	cnp	Maximum Number Of Times Annual Salary Included In Severance Benefits MaximumNumberOfTimesAnnualSalaryIncludedInSeveranceBenefits	3	salary_severance_benefits
CY2016	cnp	Other Revenue Excluding Assessed Tax OtherRevenueExcludingAssessedTax	60000000	USD
CY2017	cnp	Other Revenue Excluding Assessed Tax OtherRevenueExcludingAssessedTax	7000000	USD
CY2018	cnp	Other Revenue Excluding Assessed Tax OtherRevenueExcludingAssessedTax	-34000000	USD
CY2018	cnp	Saleof Units Percentage Trigger Rightof First Refusal SaleofUnitsPercentageTriggerRightofFirstRefusal	0.05
CY2016	cnp	Tax Benefit From Remeasurementof Deferred Taxes Dueto Tax Reform TaxBenefitFromRemeasurementofDeferredTaxesDuetoTaxReform	0	USD
CY2017	cnp	Tax Benefit From Remeasurementof Deferred Taxes Dueto Tax Reform TaxBenefitFromRemeasurementofDeferredTaxesDuetoTaxReform	1113000000	USD
CY2017	cnp	Tax Benefit From Remeasurementof Deferred Taxes Dueto Tax Reform TaxBenefitFromRemeasurementofDeferredTaxesDuetoTaxReform	1100000000	USD
CY2018	cnp	Tax Benefit From Remeasurementof Deferred Taxes Dueto Tax Reform TaxBenefitFromRemeasurementofDeferredTaxesDuetoTaxReform	0	USD
CY2016	cnp	Totaldistributionsreceivedfrom Enable TotaldistributionsreceivedfromEnable	319000000	USD
CY2017	cnp	Totaldistributionsreceivedfrom Enable TotaldistributionsreceivedfromEnable	333000000	USD
CY2018	cnp	Totaldistributionsreceivedfrom Enable TotaldistributionsreceivedfromEnable	333000000	USD
CY2017Q4	cnp	Transition And System Restoration Bonds Long Term Debt Current TransitionAndSystemRestorationBondsLongTermDebtCurrent	434000000	USD
CY2018Q4	cnp	Transition And System Restoration Bonds Long Term Debt Current TransitionAndSystemRestorationBondsLongTermDebtCurrent	458000000	USD
CY2017Q4	cnp	Transition And System Restoration Bonds Long Term Debt Non Current TransitionAndSystemRestorationBondsLongTermDebtNonCurrent	1434000000	USD
CY2018Q4	cnp	Transition And System Restoration Bonds Long Term Debt Non Current TransitionAndSystemRestorationBondsLongTermDebtNonCurrent	977000000	USD
CY2017Q4	cnp	Unrecognized Equity Return UnrecognizedEquityReturn	287000000	USD
CY2018Q4	cnp	Unrecognized Equity Return UnrecognizedEquityReturn	213000000	USD
CY2018	cnp	Weather Hedges Term WeatherHedgesTerm	P10Y
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0001130310
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	501206304	shares
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	11873304802	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	CENTERPOINT ENERGY INC
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1000000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1190000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5974000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6223000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	71000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	68000000	USD
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CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-68000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-108000000	USD
CY2017Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	2000000	USD
CY2018Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	0	USD
CY2017Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4209000000	USD
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CY2016	us-gaap	Adjustment For Amortization AdjustmentForAmortization	64000000	USD
CY2017	us-gaap	Adjustment For Amortization AdjustmentForAmortization	88000000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	86000000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	19000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	18000000	USD
CY2016	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	26000000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	24000000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	48000000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10000000	USD
CY2016	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	455000000	USD
CY2017	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	329000000	USD
CY2018	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	531000000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	205000000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	281000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	258000000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	8000000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	10000000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	68000000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-33000000	USD
CY2016Q4	us-gaap	Assets Assets	21829000000	USD
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CY2018Q4	us-gaap	Assets Current AssetsCurrent	7025000000	USD
CY2017Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1199000000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	747000000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	87000000	USD
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CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	201000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	260000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4231000000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	300000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	381000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	296000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4278000000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	81000000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-85000000	USD
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CY2017Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2018Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.03
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.3475
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.12
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	431044845	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	501197784	shares
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	4000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	5000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	427000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1795000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	308000000	USD
CY2017Q4	us-gaap	Cost Method Investments CostMethodInvestments	363000000	USD
CY2018Q4	us-gaap	Cost Method Investments CostMethodInvestments	363000000	USD
CY2016	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1983000000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	3785000000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	4364000000	USD
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CY2017	us-gaap	Costs And Expenses CostsAndExpenses	8478000000	USD
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CY2017Q4	us-gaap	Credit Risk Derivative Assets At Fair Value CreditRiskDerivativeAssetsAtFairValue	154000000	USD
CY2018Q4	us-gaap	Credit Risk Derivative Assets At Fair Value CreditRiskDerivativeAssetsAtFairValue	138000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	23000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	32000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	89000000	USD
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CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	41000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	98000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	18000000	USD
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CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9000000	USD
CY2017Q4	us-gaap	Debt Current DebtCurrent	645000000	USD
CY2018Q4	us-gaap	Debt Current DebtCurrent	482000000	USD
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CY2017	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	3000000	USD
CY2018	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	3000000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	185000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-806000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-25000000	USD
CY2017Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Fair Value Hedge DeferredGainLossOnDiscontinuationOfFairValueHedge	14000000	USD
CY2018Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Fair Value Hedge DeferredGainLossOnDiscontinuationOfFairValueHedge	1000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	213000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-770000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	48000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3850000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3912000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	28000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	36000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	73000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	676000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	673000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	90000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	84000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	347000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	356000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	162000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	160000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	68000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	62000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	18000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3174000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3239000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	13000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	27000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	927000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	987000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	502000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	478000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3174000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3239000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1808000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1894000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	473000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	395000000	USD
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CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	41000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	43000000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2018	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2018	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.5
CY2016	us-gaap	Depreciation Depreciation	607000000	USD
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CY2018	us-gaap	Depreciation Depreciation	626000000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1126000000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1036000000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1243000000	USD
CY2017Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	64000000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	82000000	USD
CY2017Q4	us-gaap	Derivative Assets DerivativeAssets	80000000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	110000000	USD
CY2018Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	100000000	USD
CY2017Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	44000000	USD
CY2018Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	38000000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	57000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	218000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	220000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	775000000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	833000000	USD
CY2016	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-431000000	USD
CY2017	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	260000000	USD
CY2018	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-123000000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	20000000	USD
CY2018Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	126000000	USD
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	4000000	USD
CY2018Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	5000000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	83000000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	101000000	USD
CY2017Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	2000000	USD
CY2018Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	1000000	USD
CY2017Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	120000000	USD
CY2018Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	187000000	USD
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CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.31
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.01
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.16
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.17
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.35
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.18
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.99
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.13
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.17
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.35
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.37
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.69
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.28
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8000000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	5000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	6000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	5000000	USD
CY2017Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	222000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	194000000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2472000000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	2482000000	USD
CY2016	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-402000000	USD
CY2017	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	87000000	USD
CY2018	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	18000000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	12000000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	96000000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	30000000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases	12000000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases	0	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases	0	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	27000000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	11000000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	39000000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-712000000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	14000000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	5000000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	1000000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	17000000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-656000000	USD
CY2015Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	12000000	USD
CY2016Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-704000000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-622000000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	30000000	USD
CY2017Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	692000000	USD
CY2018Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	732000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	31000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	41000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	11000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	5000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	6000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	6000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	105000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	106000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	74000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	65000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	867000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	867000000	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	686000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1063000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	514000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	208000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	265000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	307000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	208000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	265000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	40000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	254000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-729000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	146000000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	32000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	240000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	372000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	108000000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	0	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	24000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	11000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-16000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-17000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-3000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	27000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	26000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	22000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-104000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	15000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	89000000	USD
CY2016	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	117000000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	216000000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	154000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	133000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	136000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	220000000	USD
CY2016	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-30000000	USD
CY2017	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	84000000	USD
CY2018	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-103000000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-142000000	USD
CY2017	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-30000000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	0	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-34000000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	7000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1000000	USD
CY2016	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	-101000000	USD
CY2017	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	55000000	USD
CY2018	us-gaap	Increase Decrease In Margin Deposits Outstanding IncreaseDecreaseInMarginDepositsOutstanding	-5000000	USD
CY2016	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	25000000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	3000000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	0	USD
CY2016	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	22000000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	34000000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-24000000	USD
CY2016	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	16000000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	4000000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-6000000	USD
CY2016	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	30000000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	36000000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	12000000	USD
CY2016	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	72000000	USD
CY2017	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	85000000	USD
CY2018	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	-33000000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	60000000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	107000000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-28000000	USD
CY2016	us-gaap	Interest And Debt Expense InterestAndDebtExpense	338000000	USD
CY2017	us-gaap	Interest And Debt Expense InterestAndDebtExpense	313000000	USD
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	361000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	406000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	378000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	363000000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	104000000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	121000000	USD
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	175000000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	200000000	USD
CY2016	us-gaap	Inventory Write Down InventoryWriteDown	1000000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	0	USD
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	2000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22736000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	27009000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3069000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3302000000	USD
CY2017Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	6784000000	USD
CY2018Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	6967000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	2900000000	USD
CY2018Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	4500000000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	8195000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	8682000000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8195000000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8682000000	USD
CY2017Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	960000000	USD
CY2018Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	540000000	USD
CY2016	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	326000000	USD
CY2017	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	7000000	USD
CY2018	us-gaap	Marketable Securities Gain Loss MarketableSecuritiesGainLoss	-22000000	USD
CY2016	us-gaap	Marketable Securities Unrealized Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments	326000000	USD
CY2017	us-gaap	Marketable Securities Unrealized Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments	7000000	USD
CY2018	us-gaap	Marketable Securities Unrealized Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments	-22000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-808000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-245000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3053000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1034000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1257000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1207000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1923000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1417000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2136000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	432000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1792000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	368000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	432000000	USD
CY2017Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	192000000	USD
CY2017Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	135000000	USD
CY2017Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	169000000	USD
CY2017Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1296000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1792000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	165000000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-75000000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	153000000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	90000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	333000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	432000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1792000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	333000000	USD
CY2017Q4	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-11000000	USD
CY2018Q4	us-gaap	Net Regulatory Assets NetRegulatoryAssets	-519000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-337000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-73000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-317000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1023000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	291000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	240000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	297000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	308000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1136000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	251000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	187000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	226000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	167000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	831000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	36000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	6000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	6000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	191000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	223000000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	7000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-6000000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	10000000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	4000000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-6000000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	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 Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-15000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	0	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	-4000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-25000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-6000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-6000000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	368000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	341000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	357000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	402000000	USD
CY2017Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	50000000	USD
CY2018Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	0	USD
CY2017Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	6761000000	USD
CY2018Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	7705000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-29000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-4000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	50000000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	48000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	24000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	12000000	USD
CY2016	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2017	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2018	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2016	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	9000000	USD
CY2017	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	13000000	USD
CY2018	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	47000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-7000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-16000000	USD
CY2016	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	22000000	USD
CY2017	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	5000000	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	443000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	461000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	499000000	USD
CY2016	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2017	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	11000000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	102000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	132000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2016	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	363000000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	0	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1414000000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1426000000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1651000000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	785000000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	796000000	USD
CY2016	us-gaap	Pension Contributions PensionContributions	9000000	USD
CY2017	us-gaap	Pension Contributions PensionContributions	48000000	USD
CY2018	us-gaap	Pension Contributions PensionContributions	69000000	USD
CY2016	us-gaap	Postemployment Benefits Period Expense PostemploymentBenefitsPeriodExpense	5000000	USD
CY2017	us-gaap	Postemployment Benefits Period Expense PostemploymentBenefitsPeriodExpense	6000000	USD
CY2018	us-gaap	Postemployment Benefits Period Expense PostemploymentBenefitsPeriodExpense	3000000	USD
CY2016	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	0	USD
CY2017	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	0	USD
CY2018	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	35000000	USD
CY2016	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	35000000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	241000000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	192000000	USD
CY2016	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	297000000	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	297000000	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	30000000	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	1844000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	600000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1096000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2495000000	USD
CY2018Q3	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	790000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	1740000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-5000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	469000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	349000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Commercial Paper ProceedsFromRepaymentsOfCommercialPaper	-1543000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-5000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	4000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-39000000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	178000000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	398000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	19031000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	20267000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	13057000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	14044000000	USD
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	7000000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	14000000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	16000000	USD
CY2016	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5440000000	USD
CY2017	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	5603000000	USD
CY2018	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	6163000000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	2477000000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	2044000000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2347000000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1967000000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	2488000000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	2563000000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2464000000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2525000000	USD
CY2016	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	363000000	USD
CY2017	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	0	USD
CY2018	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	0	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1218000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1211000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	484000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	543000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	349000000	USD
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5711000000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	6124000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	6745000000	USD
CY2016	us-gaap	Revenues Revenues	7528000000	USD
CY2017Q1	us-gaap	Revenues Revenues	2735000000	USD
CY2017Q2	us-gaap	Revenues Revenues	2143000000	USD
CY2017Q3	us-gaap	Revenues Revenues	2098000000	USD
CY2017Q4	us-gaap	Revenues Revenues	2638000000	USD
CY2017	us-gaap	Revenues Revenues	9614000000	USD
CY2018Q1	us-gaap	Revenues Revenues	3155000000	USD
CY2018Q2	us-gaap	Revenues Revenues	2186000000	USD
CY2018Q3	us-gaap	Revenues Revenues	2212000000	USD
CY2018Q4	us-gaap	Revenues Revenues	3036000000	USD
CY2018	us-gaap	Revenues Revenues	10589000000	USD
CY2017Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	1590000000	USD
CY2018Q4	us-gaap	Securitized Regulatory Transition Assets Noncurrent SecuritizedRegulatoryTransitionAssetsNoncurrent	1059000000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	14000000	shares
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	39000000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	3460000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	4688000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	8058000000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	384000000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	391000000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	406000000	USD
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	181000000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	204000000	USD
CY2017Q4	us-gaap	Unamortized Loss Reacquired Debt Noncurrent UnamortizedLossReacquiredDebtNoncurrent	75000000	USD
CY2018Q4	us-gaap	Unamortized Loss Reacquired Debt Noncurrent UnamortizedLossReacquiredDebtNoncurrent	68000000	USD
CY2017Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	427000000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	378000000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	2088000000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	4011000000	USD
CY2018	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	4426000000	USD
CY2016	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	983000000	USD
CY2017	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	1109000000	USD
CY2018	us-gaap	Utilities Operating Expense Gas And Petroleum Purchased UtilitiesOperatingExpenseGasAndPetroleumPurchased	1410000000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	2029000000	USD
CY2017	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	2157000000	USD
CY2018	us-gaap	Utilities Operating Expense Maintenance Operations And Other Costs And Expenses UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses	2335000000	USD
CY2016	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	3000000	USD
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	433603000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	434308000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	452465000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	430606000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	430964000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	448829000	shares
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></div>

Files In Submission

Name	View Source	Status
0001130310-19-000016-index-headers.html	Edgar Link	pending
0001130310-19-000016-index.html	Edgar Link	pending
0001130310-19-000016.txt	Edgar Link	pending
0001130310-19-000016-xbrl.zip	Edgar Link	pending
cehe_exhibit2312x12312018.htm	Edgar Link	pending
cehe_exhibit3112x12312018.htm	Edgar Link	pending
cehe_exhibit3122x12312018.htm	Edgar Link	pending
cehe_exhibit3212x12312018.htm	Edgar Link	pending
cehe_exhibit3222x12312018.htm	Edgar Link	pending
cehe_exhibit4h24.htm	Edgar Link	pending
cerc_exhibit2313x12312018.htm	Edgar Link	pending
cerc_exhibit3113x12312018.htm	Edgar Link	pending
cerc_exhibit3123x12312018.htm	Edgar Link	pending
cerc_exhibit3213x12312018.htm	Edgar Link	pending
cerc_exhibit3223x12312018.htm	Edgar Link	pending
cesonlycombinedcolor01.jpg	Edgar Link	pending
cnp-20181231.xml	Edgar Link	completed
cnp-20181231.xsd	Edgar Link	pending
cnp-20181231_cal.xml	Edgar Link	unprocessable
cnp-20181231_def.xml	Edgar Link	unprocessable
cnp-20181231_lab.xml	Edgar Link	unprocessable
cnp-20181231_pre.xml	Edgar Link	unprocessable
cnpstructurechart1.jpg	Edgar Link	pending
cnpstructurechart2colora01.jpg	Edgar Link	pending
cnp_10kx12312018.htm	Edgar Link	pending
cnp_exhibit10hx12312018.htm	Edgar Link	pending
cnp_exhibit10rx12312018.htm	Edgar Link	pending
cnp_exhibit10sx12312018.htm	Edgar Link	pending
cnp_exhibit21x12312018.htm	Edgar Link	pending
cnp_exhibit2311x12312018.htm	Edgar Link	pending
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cnp_exhibit3111x12312018.htm	Edgar Link	pending
cnp_exhibit3121x12312018.htm	Edgar Link	pending
cnp_exhibit3211x12312018.htm	Edgar Link	pending
cnp_exhibit3221x12312018.htm	Edgar Link	pending
electrica05.jpg	Edgar Link	pending
exhibit10m1_12312018.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
ngddescriptiona10.jpg	Edgar Link	pending
ngdterritorya11.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
usmapa15.jpg	Edgar Link	pending
usmaplegenda17.jpg	Edgar Link	pending
vectrenutilityterritorya01.jpg	Edgar Link	pending

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$CNP
CENTERPOINT ENERGY INC Stock $cnp

2018 Q4 Form 10-K Financial Statement

#000113031019000016 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CNP CENTERPOINT ENERGY INC Stock $cnp

2018 Q4 Form 10-K Financial Statement

#000113031019000016 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CNP
CENTERPOINT ENERGY INC Stock $cnp