$MPLX
MPLX LP Stock $mplx

$mplx Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000155200019000006 Filed on February 28, 2019

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$1.085B	$980.0M	$916.0M
YoY Change	27.95%	16.95%	31.23%
Cost Of Revenue	$501.0M	$432.0M	$402.0M
YoY Change	31.84%	19.67%	17.54%
Gross Profit	$585.0M	$548.0M	$514.0M
YoY Change	25.0%	15.13%	44.38%
Gross Profit Margin	53.92%	55.92%	56.11%
Selling, General & Admin	$81.00M	$73.00M	$70.00M
YoY Change	19.12%	7.35%	-7.89%
% of Gross Profit	13.85%	13.32%	13.62%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$168.0M	$164.0M	$164.0M
YoY Change	9.8%	8.61%	8.61%
% of Gross Profit	28.72%	29.93%	31.91%
Operating Expenses	$249.0M	$237.0M	$234.0M
YoY Change	12.67%	8.22%	3.08%
Operating Profit	$336.0M	$311.0M	$280.0M
YoY Change	36.03%	21.01%	117.05%
Interest Expense	-$80.00M	-$78.00M	-$74.00M
YoY Change	53.85%	52.94%	42.31%
% of Operating Profit	-23.81%	-25.08%	-26.43%
Other Income/Expense, Net	-$16.00M	-$15.00M	-$13.00M
YoY Change	23.08%	15.38%	8.33%
Pretax Income	$239.0M	$218.0M	$193.0M
YoY Change	31.32%	12.37%	201.56%
Income Tax	-$2.000M	$1.000M	$2.000M
% Of Pretax Income	-0.84%	0.46%	1.04%
Net Earnings	$238.0M	$216.0M	$190.0M
YoY Change	78.95%	53.19%	900.0%
Net Earnings / Revenue	21.94%	22.04%	20.74%
Basic Earnings Per Share
Diluted Earnings Per Share	$581.9K	$546.8K	$497.4K
COMMON SHARES
Basic Shares Outstanding
Diluted Shares Outstanding

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$5.000M	$3.000M	$293.0M
YoY Change	-97.86%	-98.56%	737.14%
Cash & Equivalents	$5.000M	$3.000M	$293.0M
Short-Term Investments
Other Short-Term Assets	$37.00M	$32.00M	$31.00M
YoY Change	12.12%	-3.03%	29.17%
Inventory	$65.00M	$64.00M	$62.00M
Prepaid Expenses
Receivables	$292.0M	$320.0M	$284.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$559.0M	$571.0M	$843.0M
YoY Change	-35.6%	-16.76%	73.46%
LONG-TERM ASSETS
Property, Plant & Equipment	$12.19B	$11.92B	$11.64B
YoY Change	6.83%	13.14%	12.34%
Goodwill	$2.245B	$2.245B	$2.245B
YoY Change	0.0%	2.09%	2.09%
Intangibles	$453.0M	$463.0M	$473.0M
YoY Change	-7.93%	-7.58%	-7.44%
Long-Term Investments	$4.010B	$3.997B	$3.368B
YoY Change	62.28%	61.49%	35.53%
Other Assets	$26.00M	$22.00M	$18.00M
YoY Change	85.71%	57.14%	50.0%
Total Long-Term Assets	$18.94B	$18.67B	$17.76B
YoY Change	13.82%	18.68%	13.88%
TOTAL ASSETS
Total Short-Term Assets	$559.0M	$571.0M	$843.0M
Total Long-Term Assets	$18.94B	$18.67B	$17.76B
Total Assets	$19.50B	$19.24B	$18.60B
YoY Change	11.37%	17.2%	15.69%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$151.0M	$152.0M	$144.0M
YoY Change	7.86%	42.06%	41.18%
Accrued Expenses	$231.0M	$202.0M	$178.0M
YoY Change	-0.43%	4.66%	-1.11%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.304B	$1.048B	$790.0M
YoY Change	70.9%	56.42%	21.54%
LONG-TERM LIABILITIES
Long-Term Debt	$7.945B	$7.848B	$7.666B
YoY Change	46.53%	45.04%	42.15%
Other Long-Term Liabilities	$273.0M	$249.0M	$229.0M
YoY Change	31.25%	42.29%	17.44%
Total Long-Term Liabilities	$8.218B	$8.097B	$7.895B
YoY Change	45.97%	44.95%	41.28%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.304B	$1.048B	$790.0M
Total Long-Term Liabilities	$8.218B	$8.097B	$7.895B
Total Liabilities	$8.527B	$8.152B	$7.692B
YoY Change	57.94%	54.95%	37.04%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$9.827B	$9.941B	$9.763B
YoY Change
Total Liabilities & Shareholders Equity	$19.50B	$19.24B	$18.60B
YoY Change	11.37%	17.2%	15.69%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$238.0M	$216.0M	$190.0M
YoY Change	78.95%	53.19%	900.0%
Depreciation, Depletion And Amortization	$168.0M	$164.0M	$164.0M
YoY Change	9.8%	8.61%	8.61%
Cash From Operating Activities	$569.0M	$494.0M	$467.0M
YoY Change	10.27%	61.97%	24.53%
INVESTING ACTIVITIES
Capital Expenditures	-$407.0M	$352.0M	$372.0M
YoY Change	10.0%	4.45%	23.18%
Acquisitions
YoY Change
Other Investing Activities	-$63.00M	-$81.00M	-$79.00M
YoY Change	-59.35%	-268.75%	64.58%
Cash From Investing Activities	-$470.0M	-$433.0M	-$451.0M
YoY Change	-10.48%	49.83%	24.24%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-97.00M	-351.0M	12.00M
YoY Change	-412.9%	-323.57%	-36.84%
NET CHANGE
Cash From Operating Activities	569.0M	494.0M	467.0M
Cash From Investing Activities	-470.0M	-433.0M	-451.0M
Cash From Financing Activities	-97.00M	-351.0M	12.00M
Net Change In Cash	2.000M	-290.0M	28.00M
YoY Change	-90.91%	-267.63%	-9.68%
FREE CASH FLOW
Cash From Operating Activities	$569.0M	$494.0M	$467.0M
Capital Expenditures	-$407.0M	$352.0M	$372.0M
Free Cash Flow	$976.0M	$142.0M	$95.00M
YoY Change	10.16%	-543.75%	30.14%

Facts In Submission

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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	0001552000
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	9800000000	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	MPLX LP
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
CY2018	dei	Trading Symbol TradingSymbol	MPLX
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CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	8250000000	USD
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CY2018Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	0	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-12000000	USD
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CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-1000000	USD
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CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5000000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	453000000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	424000000	USD
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	28000000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	32000000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	33000000	USD
CY2016	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	210000000	USD
CY2017	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	296000000	USD
CY2018	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	534000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	213000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	263000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	484000000	USD
CY2017Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	88000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-73000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1417000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2308000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2686000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1491000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1907000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2826000000	USD
CY2018Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	143000000	USD
CY2017Q4	us-gaap	Inventory Gross InventoryGross	65000000	USD
CY2018Q4	us-gaap	Inventory Gross InventoryGross	77000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	57000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	64000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	85000000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	8527000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	14911000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	19500000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22779000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1304000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1186000000	USD
CY2016Q1	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2017Q1	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2018Q1	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2018	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2012Q1	us-gaap	Limited Liability Company Or Limited Partnership Business Formation Date LimitedLiabilityCompanyOrLimitedPartnershipBusinessFormationDate	2012-03-27
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6945000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	13392000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1500000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	5000000	USD
CY2016	us-gaap	Managing Member Or General Partner Subsequent Distribution Amount ManagingMemberOrGeneralPartnerSubsequentDistributionAmount	205000000	USD
CY2017	us-gaap	Managing Member Or General Partner Subsequent Distribution Amount ManagingMemberOrGeneralPartnerSubsequentDistributionAmount	328000000	USD
CY2018	us-gaap	Managing Member Or General Partner Subsequent Distribution Amount ManagingMemberOrGeneralPartnerSubsequentDistributionAmount	0	USD
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3000000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	7000000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	17000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	113000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	171000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	233000000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	150000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	190000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	216000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	238000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	794000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	421000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	453000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	510000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	434000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1818000000	USD
CY2016	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	191000000	USD
CY2017	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	318000000	USD
CY2018	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	0	USD
CY2016	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	1000000	USD
CY2017	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	411000000	USD
CY2018	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	1743000000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	16000000	USD
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2016	us-gaap	Number Of Reporting Units NumberOfReportingUnits	3
CY2018	us-gaap	Number Of Reporting Units NumberOfReportingUnits	8
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1051000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	73000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	58000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	64000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	67000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	70000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	719000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	7559000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	908000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	758000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	775000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	777000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	909000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	3432000000	USD
CY2016	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	298000000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	277000000	USD
CY2018	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	349000000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	37000000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	46000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	26000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	35000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-14000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2000000	USD
CY2017Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	53000000	USD
CY2018Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	59000000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	81000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-122000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	83000000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-50000000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-56000000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	16000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	28000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	45000000	USD
CY2016	us-gaap	Other Operating Income OtherOperatingIncome	7000000	USD
CY2017	us-gaap	Other Operating Income OtherOperatingIncome	6000000	USD
CY2018	us-gaap	Other Operating Income OtherOperatingIncome	7000000	USD
CY2017Q4	us-gaap	Partners Capital PartnersCapital	9827000000	USD
CY2018Q4	us-gaap	Partners Capital PartnersCapital	6708000000	USD
CY2017	us-gaap	Partners Capital Account Acquisitions PartnersCapitalAccountAcquisitions	-1931000000	USD
CY2018	us-gaap	Partners Capital Account Acquisitions PartnersCapitalAccountAcquisitions	-4100000000	USD
CY2016	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	845000000	USD
CY2017	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	1120000000	USD
CY2018	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	1819000000	USD
CY2016	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	0	USD
CY2017	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	0	USD
CY2018	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	0	USD
CY2016	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	792000000	USD
CY2017	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	483000000	USD
CY2015Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	311469407	shares
CY2016Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	368555271	shares
CY2017Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	415438793	shares
CY2018Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	794089518	shares
CY2016	us-gaap	Partners Capital Account Units Acquisitions PartnersCapitalAccountUnitsAcquisitions	22993880	shares
CY2016	us-gaap	Partners Capital Account Units Contributed PartnersCapitalAccountUnitsContributed	6716419	shares
CY2016	us-gaap	Partners Capital Account Units Converted PartnersCapitalAccountUnitsConverted	366509	shares
CY2017	us-gaap	Partners Capital Account Units Converted PartnersCapitalAccountUnitsConverted	366509	shares
CY2016	us-gaap	Partners Capital Account Units Sale Of Units PartnersCapitalAccountUnitsSaleOfUnits	26885597	shares
CY2017	us-gaap	Partners Capital Account Units Sale Of Units PartnersCapitalAccountUnitsSaleOfUnits	14129589	shares
CY2016	us-gaap	Partners Capital Account Units Unitbased Compensation PartnersCapitalAccountUnitsUnitbasedCompensation	123459	shares
CY2017	us-gaap	Partners Capital Account Units Unitbased Compensation PartnersCapitalAccountUnitsUnitbasedCompensation	273639	shares
CY2018	us-gaap	Partners Capital Account Units Unitbased Compensation PartnersCapitalAccountUnitsUnitbasedCompensation	348527	shares
CY2017Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	146000000	USD
CY2018Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	156000000	USD
CY2015Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	9946000000	USD
CY2016Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	11110000000	USD
CY2017Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	9973000000	USD
CY2018Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	6864000000	USD
CY2016	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	17000000	USD
CY2017	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-80000000	USD
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	29000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	76000000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	249000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	451000000	USD
CY2016	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	87000000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	761000000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	341000000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1313000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1411000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1919000000	USD
CY2016	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	3000000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	7000000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	17000000	USD
CY2016	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	225000000	USD
CY2017	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2018	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2016	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	26000000	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	16000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	434000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2911000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	13186000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Preferred Limited Partners Units ProceedsFromIssuanceOfPreferredLimitedPartnersUnits	984000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Preferred Limited Partners Units ProceedsFromIssuanceOfPreferredLimitedPartnersUnits	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Preferred Limited Partners Units ProceedsFromIssuanceOfPreferredLimitedPartnersUnits	0	USD
CY2016	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	792000000	USD
CY2017	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	483000000	USD
CY2018	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	0	USD
CY2016	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	6000000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	129000000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	11000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-11000000	USD
CY2016	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	2532000000	USD
CY2017	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	2369000000	USD
CY2018	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	3962000000	USD
CY2016	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	1000000	USD
CY2017	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	7000000	USD
CY2018	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	8000000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	434000000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	187000000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	191000000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	217000000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	241000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	836000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	423000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	456000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	516000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	439000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1834000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	14462000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	18316000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12187000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	14639000000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	1056000000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	2038000000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	3119000000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	5714000000	USD
CY2017Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	2063000000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	3676000000	USD
CY2018Q4	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	746000000	USD
CY2016	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	86000000	USD
CY2017	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	92000000	USD
CY2018	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	99000000	USD
CY2017	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	44000000	USD
CY2018	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	8000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1312000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	416000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6780000000	USD
CY2016	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	2540000000	USD
CY2017	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	1983000000	USD
CY2018	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	4347000000	USD
CY2017Q4	us-gaap	Restricted Cash RestrictedCash	4000000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	8000000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	4000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5007000000	USD
CY2017	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	11000000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	5000000	USD
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	10139000000	USD
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P25Y
CY2016	us-gaap	Revenues Revenues	3029000000	USD
CY2017Q1	us-gaap	Revenues Revenues	886000000	USD
CY2017Q2	us-gaap	Revenues Revenues	916000000	USD
CY2017Q3	us-gaap	Revenues Revenues	980000000	USD
CY2017Q4	us-gaap	Revenues Revenues	1085000000	USD
CY2017	us-gaap	Revenues Revenues	3867000000	USD
CY2018Q1	us-gaap	Revenues Revenues	1420000000	USD
CY2018Q2	us-gaap	Revenues Revenues	1578000000	USD
CY2018Q3	us-gaap	Revenues Revenues	1712000000	USD
CY2018Q4	us-gaap	Revenues Revenues	1715000000	USD
CY2018	us-gaap	Revenues Revenues	6425000000	USD
CY2016	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	0	USD
CY2017	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	0	USD
CY2018	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	0	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	6000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	8000000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	11000000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	50000000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	54000000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	72000000	USD
CY2017Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	1000000000	USD
CY2018Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	1004000000	USD
CY2017Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	27000000	USD
CY2018Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	97000000	USD
CY2016	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-705000000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-494000000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-242000000	USD
CY2016	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-705000000	USD
CY2017	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-494000000	USD
CY2018	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-242000000	USD
CY2016	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	338000000	shares
CY2017	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	393000000	shares
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	761000000	shares
CY2016	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	345000000	shares
CY2017	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	396000000	shares
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	761000000	shares
CY2018	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Not Yet Adopted</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%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">ASU 2017-12, Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In August 2017, the FASB issued an ASU to amend the hedge accounting rules to simplify the application of hedge accounting guidance and better portray the economic results of risk management activities in the financial statements. The guidance expands the ability to hedge nonfinancial and financial risk components, reduces complexity in fair value hedges of interest rate risk, eliminates the requirement to separately measure and report hedge ineffectiveness and eases certain hedge effectiveness assessment requirements. The guidance is effective beginning in 2019 with early adoption permitted. We do not expect the adoption of this ASU to have a material impact on our consolidated financial statements.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">ASU 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In January 2017, the FASB issued an ASU which simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Under the new guidance, the recognition of an impairment charge is calculated based on the amount by which the carrying amount exceeds the reporting unit’s fair value, which could be different from the amount calculated under the current method using the implied fair value of the goodwill; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance should be applied on a prospective basis, and is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">ASU 2016-13, Credit Losses - Measurement of Credit Losses on Financial Instruments</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In June 2016, the FASB issued an ASU related to the accounting for credit losses on certain financial instruments. The guidance requires that for most financial assets, losses be based on an expected loss approach which includes estimates of losses over the life of exposure that considers historical, current and forecasted information. Expanded disclosures related to the methods used to estimate the losses as well as a specific disaggregation of balances for financial assets are also required. The change is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. MPLX does not expect application of this ASU to have a material impact on our consolidated financial statements. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">ASU 2016-02, Leases and related updates</font><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In February 2016, the FASB issued an ASU requiring lessees to record virtually all leases on their balance sheets. The ASU also requires expanded disclosures to help financial statement users better understand the amount, timing and uncertainty of cash flows arising from leases. For lessors, this amended guidance modifies the classification criteria and the accounting for sales-type and direct financing leases. The guidance will be effective for fiscal years beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. As of January 1, 2019, we have transitioned to the new guidance. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As part of implementing this standard, MPLX evaluated the impact to our financial statements, disclosures, internal controls and accounting policies. This evaluation process included reviewing all forms of leases, performing a completeness assessment over the lease population and analyzing the practical expedients in order to determine the best path of implementing changes to existing processes and controls. We have implemented a third-party supported lease accounting information system to account for our lease population in accordance with this new standard and established internal controls over the new system. We expect that adoption of the standard will result in the recognition of right-of-use assets and lease liabilities for operating leases in the range of</font><font style="font-family:inherit;font-size:10pt;">$450 million</font><font style="font-family:inherit;font-size:10pt;"> to </font><font style="font-family:inherit;font-size:10pt;">$550 million</font><font style="font-family:inherit;font-size:10pt;">. The adoption of ASC 842 will not have a material impact on our consolidated statements of income or cash flows, except for the potential effects from lease modifications as discussed below.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In addition, based on the changes presented in the standard, MPLX, as a lessor, may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases. If such a modification were to occur, it may result in the de-recognition of existing assets, recognition of a receivable in the amount of the present value of fixed payments expected to be received by MPLX under the lease, and recognition of a corresponding gain or loss in the period of change. MPLX will evaluate the impact of a lease reassessment as modifications occur.</font></div></div>
CY2018	us-gaap	Incentive Distribution Policy Managing Member Or General Partner Description IncentiveDistributionPolicyManagingMemberOrGeneralPartnerDescription	<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;">Distributions</font><font style="font-family:inherit;font-size:10pt;"> – In preparing the Consolidated Statements of Equity, net income attributable to MPLX LP is allocated to preferred unitholders based on a fixed distribution schedule, as discussed in Note </font><font style="font-family:inherit;font-size:10pt;">9</font><font style="font-family:inherit;font-size:10pt;">, and subsequently allocated to the general partner and limited partner unitholders. Distributions, although earned, are not accrued as a liability until declared. However, when distributions related to the eliminated IDRs were made, earnings equal to the amount of those distributions were first allocated to the general partner before the remaining earnings are allocated to the limited partner unitholders based on their respective ownership percentages. The allocation of net income attributable to MPLX LP for purposes of calculating net income per limited partner unit is described in below.</font></div></div>
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font><font style="font-family:inherit;font-size:10pt;"> – The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the respective reporting periods. Actual results could differ materially from those estimates. Estimates are subject to uncertainties due to the levels of subjectivity and judgment necessary to account for highly uncertain matters or the susceptibility of such matters to change and affect items such as valuing identified intangible assets; determining the fair value of derivative instruments; evaluating impairments of long-lived assets, goodwill and equity investments; establishing estimated useful lives for long-lived assets; acquisition accounting; recognizing share-based compensation expense; estimating revenues, expense accruals and capital expenditures; valuing AROs; and determining liabilities, if any, for environmental and legal contingencies.</font></div></div>

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$MPLX
MPLX LP Stock $mplx

2017 Q4 Form 10-K Financial Statement

#000155200019000006 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPLX MPLX LP Stock $mplx

2017 Q4 Form 10-K Financial Statement

#000155200019000006 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPLX
MPLX LP Stock $mplx