$AA
Alcoa Corp Stock $aa

$aa Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000119312518056314 Filed on February 26, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$3.174B	$2.964B	$2.859B
YoY Change	25.11%	27.26%	23.07%
Cost Of Revenue	$2.237B	$2.340B	$2.289B
YoY Change	4.68%	18.9%	17.93%
Gross Profit	$937.0M	$624.0M	$570.0M
YoY Change	134.25%	72.85%	49.21%
Gross Profit Margin	29.52%	21.05%	19.94%
Selling, General & Admin	$66.00M	$70.00M	$70.00M
YoY Change	-15.38%	-23.91%	-22.22%
% of Gross Profit	7.04%	11.22%	12.28%
Research & Development	$9.000M	$8.000M	$8.000M
YoY Change	28.57%	0.0%	14.29%
% of Gross Profit	0.96%	1.28%	1.4%
Depreciation & Amortization	$188.0M	$194.0M	$190.0M
YoY Change	3.3%	7.18%	6.74%
% of Gross Profit	20.06%	31.09%	33.33%
Operating Expenses	$262.0M	$78.00M	$78.00M
YoY Change	-1.87%	-22.0%	-19.59%
Operating Profit	$675.0M	$546.0M	$492.0M
YoY Change	407.52%	109.2%	72.63%
Interest Expense	-$36.00M	$26.00M	$25.00M
YoY Change	-25.0%	-61.19%	-62.12%
% of Operating Profit	-5.33%	4.76%	5.08%
Other Income/Expense, Net	-$86.00M	-$48.00M	-$28.00M
YoY Change	-8700.0%	-145.28%	-221.74%
Pretax Income	$257.0M	$288.0M	$237.0M
YoY Change	-287.59%	182.35%	323.21%
Income Tax	$264.0M	$119.0M	$99.00M
% Of Pretax Income	102.72%	41.32%	41.77%
Net Earnings	-$196.0M	$113.0M	$75.00M
YoY Change	56.8%	-1230.0%	-236.36%
Net Earnings / Revenue	-6.18%	3.81%	2.62%
Basic Earnings Per Share	-$1.06	$0.61	$0.41
Diluted Earnings Per Share	-$1.06	$0.60	$0.40
COMMON SHARES
Basic Shares Outstanding	185.0M shares	185.0M shares	184.0M shares
Diluted Shares Outstanding		187.0M shares	186.0M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.358B	$1.119B	$954.0M
YoY Change	59.2%	364.32%	187.35%
Cash & Equivalents	$1.358B	$1.119B	$954.0M
Short-Term Investments
Other Short-Term Assets	$384.0M	$329.0M	$347.0M
YoY Change	14.97%	-78.02%	23.49%
Inventory	$1.453B	$1.323B	$1.287B
Prepaid Expenses
Receivables	$811.0M	$840.0M	$789.0M
Other Receivables	$232.0M	$193.0M	$206.0M
Total Short-Term Assets	$4.238B	$3.804B	$3.583B
YoY Change	33.23%	5.02%	50.17%
LONG-TERM ASSETS
Property, Plant & Equipment	$9.138B	$9.282B	$9.237B
YoY Change	-2.01%	-3.4%	-3.47%
Goodwill	$989.0M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$1.410B	$1.408B	$1.378B
YoY Change	3.83%	3.38%	0.15%
Other Assets	$1.719B	$1.745B	$1.688B
YoY Change	3.06%	13.75%	-41.55%
Total Long-Term Assets	$13.21B	$13.45B	$13.35B
YoY Change	-2.59%	-1.7%	-4.59%
TOTAL ASSETS
Total Short-Term Assets	$4.238B	$3.804B	$3.583B
Total Long-Term Assets	$13.21B	$13.45B	$13.35B
Total Assets	$17.45B	$17.25B	$16.93B
YoY Change	4.22%	-0.29%	3.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.898B	$1.618B	$1.508B
YoY Change	30.45%	29.23%	18.09%
Accrued Expenses	$459.0M	$450.0M	$445.0M
YoY Change	0.66%	3.93%	52.92%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$16.00M	$17.00M	$19.00M
YoY Change	-23.81%	-19.05%	-13.64%
Total Short-Term Liabilities	$3.252B	$2.766B	$2.608B
YoY Change	15.28%	25.39%	22.38%
LONG-TERM LIABILITIES
Long-Term Debt	$1.388B	$1.384B	$1.418B
YoY Change	-2.53%	-5.01%	508.58%
Other Long-Term Liabilities	$5.700B	$4.668B	$4.356B
YoY Change	26.98%	12.08%	148.49%
Total Long-Term Liabilities	$1.388B	$6.052B	$5.774B
YoY Change	-2.53%	7.65%	190.74%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.252B	$2.766B	$2.608B
Total Long-Term Liabilities	$1.388B	$6.052B	$5.774B
Total Liabilities	$10.65B	$9.136B	$8.730B
YoY Change	17.75%	11.7%	30.43%
SHAREHOLDERS EQUITY
Retained Earnings	$113.0M	$309.0M	$196.0M
YoY Change	-208.65%
Common Stock	$9.592B	$9.586B	$9.561B
YoY Change	0.62%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.523B	$5.862B	$5.954B
YoY Change
Total Liabilities & Shareholders Equity	$17.45B	$17.25B	$16.93B
YoY Change	4.22%	-0.29%	3.39%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	-$196.0M	$113.0M	$75.00M
YoY Change	56.8%	-1230.0%	-236.36%
Depreciation, Depletion And Amortization	$188.0M	$194.0M	$190.0M
YoY Change	3.3%	7.18%	6.74%
Cash From Operating Activities	$455.0M	$384.0M	$311.0M
YoY Change	90.38%	-487.88%	-438.04%
INVESTING ACTIVITIES
Capital Expenditures	-$150.0M	-$96.00M	-$88.00M
YoY Change	2.74%	31.51%	2.33%
Acquisitions
YoY Change
Other Investing Activities	-$20.00M	-$8.000M	-$6.000M
YoY Change	-101.63%	-107.21%	-104.11%
Cash From Investing Activities	-$170.0M	-$104.0M	-$94.00M
YoY Change	-115.71%	-373.68%	-256.67%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-53.00M	-115.0M	-78.00M
YoY Change	-92.41%	228.57%	-2700.0%
NET CHANGE
Cash From Operating Activities	455.0M	384.0M	311.0M
Cash From Investing Activities	-170.0M	-104.0M	-94.00M
Cash From Financing Activities	-53.00M	-115.0M	-78.00M
Net Change In Cash	232.0M	165.0M	139.0M
YoY Change	-62.76%	-271.88%	-579.31%
FREE CASH FLOW
Cash From Operating Activities	$455.0M	$384.0M	$311.0M
Capital Expenditures	-$150.0M	-$96.00M	-$88.00M
Free Cash Flow	$605.0M	$480.0M	$399.0M
YoY Change	57.14%	-1946.15%	-6750.0%

Facts In Submission

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CY2017Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	108000000
CY2017Q4	us-gaap	Assets Assets	17447000000
CY2017Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	127000000
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1358000000
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	750000000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	185200713	shares
CY2017Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	27270482	shares
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	185200713	shares
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	2000000
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	387000000
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	668000000
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3112000000
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1185000000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	949000000
CY2017Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	70000000
CY2017Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	33000000
CY2017Q4	us-gaap	Deferred Costs DeferredCosts	139000000
CY2017Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	279000000
CY2017Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	287000000
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	517000000
CY2017Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	814000000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1185000000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	193000000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	246000000
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	113000000
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	197000000
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	57000000
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	2341000000
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	5320000000
CY2017Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	128000000
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	185000000
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	1105000000
CY2017Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	11000000
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	100000000
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1927000000
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	109000000
CY2017Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	68000000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Other DeferredTaxAssetsTaxCreditCarryforwardsOther	1734000000
CY2017Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	940000000
CY2017Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0328	pure
CY2017Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.055	pure
CY2017Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.045	pure
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	1173000000
CY2017Q4	us-gaap	Due From Related Parties DueFromRelatedParties	84000000
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	459000000
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	1862000000
CY2017Q4	us-gaap	Equity Method Investment Aggregate Cost EquityMethodInvestmentAggregateCost	1400000000
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	1699000000
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	11015000000
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	6751000000
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	24000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	225000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	10000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	10000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	10000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	10000000
CY2017Q4	us-gaap	Other Investments OtherInvestments	10000000
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	1100000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	10000000
CY2017Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	232000000
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1388000000
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	16000000
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	15000000
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	15000000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	58000000
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	412000000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	73000000
CY2017Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	1185000000
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1719000000
CY2017Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	62000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	287000000
CY2017Q4	us-gaap	Goodwill Goodwill	989000000
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	154000000
CY2017Q4	us-gaap	Inventory Net InventoryNet	1453000000
CY2017Q4	us-gaap	Investments Investments	1410000000
CY2017Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	296000000
CY2017Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	473000000
CY2017Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	147000000
CY2017Q4	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	306000000
CY2017Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	258000000
CY2017Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	1410000000
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	543000000
CY2017Q4	us-gaap	Liabilities Liabilities	10649000000
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	17447000000
CY2017Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	516000000
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3252000000
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	1404000000
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	16000000
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	30000000
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	16000000
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	15000000
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1388000000
CY2017Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	221000000
CY2017Q4	us-gaap	Minority Interest MinorityInterest	2275000000
CY2017Q4	us-gaap	Number Of Countries In Which Entity Operates NumberOfCountriesInWhichEntityOperates	10	Country
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	21000000
CY2017Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	142000000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	94000000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	15000000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	47000000
CY2017Q4	us-gaap	Value Added Tax Receivable Noncurrent ValueAddedTaxReceivableNoncurrent	340000000
CY2017Q4	aa	Number Of Structures Required To Demolish NumberOfStructuresRequiredToDemolish	24	Structure
CY2017Q4	aa	Deferred Tax Liabilities Depreciation DeferredTaxLiabilitiesDepreciation	432000000
CY2017Q4	aa	Deferred Tax Assets Depreciation DeferredTaxAssetsDepreciation	141000000
CY2017Q4	us-gaap	Other Inventory Net Of Reserves OtherInventoryNetOfReserves	585000000
CY2017Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	84000000
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	271000000
CY2017Q4	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.29	pure
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9138000000
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	9138000000
CY2017Q4	us-gaap	Recorded Unconditional Purchase Obligation Due In Fourth Year RecordedUnconditionalPurchaseObligationDueInFourthYear	192000000
CY2017Q4	us-gaap	Recorded Unconditional Purchase Obligation Due In Second Year RecordedUnconditionalPurchaseObligationDueInSecondYear	180000000
CY2017Q4	us-gaap	Recorded Unconditional Purchase Obligation Due After Fifth Year RecordedUnconditionalPurchaseObligationDueAfterFifthYear	2824000000
CY2017Q4	us-gaap	Recorded Unconditional Purchase Obligation Due In Fifth Year RecordedUnconditionalPurchaseObligationDueInFifthYear	199000000
CY2017Q4	us-gaap	Recorded Unconditional Purchase Obligation Due In Third Year RecordedUnconditionalPurchaseObligationDueInThirdYear	186000000
CY2017Q4	us-gaap	Recorded Unconditional Purchase Obligation Due Within One Year RecordedUnconditionalPurchaseObligationDueWithinOneYear	176000000
CY2017Q4	us-gaap	Restructuring Reserve RestructuringReserve	45000000
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	113000000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	76000000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.44
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice	26.19
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	4523000000
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6798000000
CY2017Q4	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	0
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10000000
CY2017Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	282000000
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	2000000
CY2017Q4	aa	Deferred Tax Liabilities Employee Benefits DeferredTaxLiabilitiesEmployeeBenefits	0
CY2017Q4	aa	Prepaid Gas Transmission Contract PrepaidGasTransmissionContract	300000000
CY2017Q4	aa	Receivables Excluded From Pension Plan Assets ReceivablesExcludedFromPensionPlanAssets	2000000
CY2017Q4	aa	Deferred Tax Liabilities Gross DeferredTaxLiabilitiesGross	668000000
CY2017Q4	aa	Segment Reporting Information Reported Assets SegmentReportingInformationReportedAssets	14798000000
CY2017Q4	aa	Gas Supply Prepayment GasSupplyPrepayment	510000000
CY2017Q4	aa	Prepaid Pension Cost Non Current PrepaidPensionCostNonCurrent	72000000
CY2017Q4	aa	Spent Pot Lining Disposal SpentPotLiningDisposal	125000000
CY2017Q4	aa	Deferred Tax Liabilities Tax Credit Carryforwards DeferredTaxLiabilitiesTaxCreditCarryforwards	0
CY2017Q4	aa	Segment Reporting Information Equity Method Investments SegmentReportingInformationEquityMethodInvestments	1383000000
CY2015	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	76000000
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10000000
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	291000000
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-1444000000
CY2017Q4	aa	Surety Bonds Expiration Date SuretyBondsExpirationDate	2018
CY2016Q2	aa	Number Of Refineries NumberOfRefineries	3	Refinery
CY2012Q2	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	250000000
CY2012Q2	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	310000000
CY2012Q2	aa	Loss Contingency Recovery From Third Party LossContingencyRecoveryFromThirdParty	303000000
CY2012Q2	aa	Loss Contingency Recovery From Third Party LossContingencyRecoveryFromThirdParty	375000000
CY2015Q3	us-gaap	Accrual For Environmental Loss Contingencies Period Increase Decrease AccrualForEnvironmentalLossContingenciesPeriodIncreaseDecrease	1000000
	aa	Separation Transaction Costs Net Of Tax SeparationTransactionCostsNetOfTax	152000000
CY2017Q3	aa	Partially Restarted Smelter Capacity PartiallyRestartedSmelterCapacity	161	kT
CY2015Q1	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	7000000
CY2015	us-gaap	Asset Impairment Charges AssetImpairmentCharges	311000000
CY2017Q4	aa	Amount Committed Under Outstanding Surety Bonds AmountCommittedUnderOutstandingSuretyBonds	122000000
CY2017Q4	aa	Demolition Demolition	113000000
CY2017Q4	aa	Guarantees Of Third Party Obligations Related To Project Financing GuaranteesOfThirdPartyObligationsRelatedToProjectFinancing	177000000
CY2017Q4	aa	Closure Of Residue Areas ClosureOfResidueAreas	238000000
CY2017Q4	aa	Properties Plants And Equipment Excluding Construction Work In Progress PropertiesPlantsAndEquipmentExcludingConstructionWorkInProgress	8751000000
CY2017Q4	aa	Undistributed Earnings Of Foreign Subsidiaries Deemed Permanently Reinvested UndistributedEarningsOfForeignSubsidiariesDeemedPermanentlyReinvested	150000000
CY2017Q4	aa	Outstanding Receivable For Labor And Other Employee Related Expenses OutstandingReceivableForLaborAndOtherEmployeeRelatedExpenses	13000000
CY2017Q4	aa	Deferred Tax Liabilities Loss Provisions DeferredTaxLiabilitiesLossProvisions	0
CY2017Q4	aa	Deferred Tax Liabilities Operating Loss Carryforwards DeferredTaxLiabilitiesOperatingLossCarryforwards	0
CY2017Q4	aa	Other Asset Retirement Obligation OtherAssetRetirementObligation	1000000
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Period Increase Decrease Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecreaseWeightedAverageExercisePrice	1.34
CY2016Q4	aa	Payment For Separation Transaction PaymentForSeparationTransaction	1072000000
CY2016Q4	aa	Stock Issued For Separation Transaction StockIssuedForSeparationTransaction	146159428	shares
CY2016Q3	aa	Discontinued Operation Conversion Ratio DiscontinuedOperationConversionRatio	0.333	pure
CY2016Q3	aa	Common Stock Distribution Spinoff Transaction Percentage CommonStockDistributionSpinoffTransactionPercentage	0.801	pure
CY2017Q4	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	36311767	shares
CY2017Q4	aa	Debt Instrument Expiration Date DebtInstrumentExpirationDate	2018
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3000000
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	313000000
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	316000000
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0
CY2015	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	171000000
CY2015	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	9039000000
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	59000000
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-85000000
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	86000000
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	30000000
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0
CY2015	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2019
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	780000000
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-1.193	pure
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-4.73
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.626	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.033	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Holidays EffectiveIncomeTaxRateReconciliationTaxHolidays	0.062	pure
CY2015	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-38000000
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-4.73
CY2015	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	86000000
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	43000000
CY2015	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	152000000
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	3209000000
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.003	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.142	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.085	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.037	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.820	pure
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	4119000000
CY2015	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	39000000
CY2015	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-25000000
CY2015	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	32000000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-1053000000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-337000000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	716000000
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	265000000
CY2015	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	7000000
CY2015	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	20000000
CY2015	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	356000000
CY2015	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-311000000
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-212000000
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	53000000
CY2015	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-158000000
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	402000000
CY2015	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-156000000
CY2015	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-32000000
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-58000000
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CY2015	us-gaap	Interest Expense InterestExpense	270000000
CY2015	us-gaap	Interest Costs Incurred InterestCostsIncurred	300000000
CY2015	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	10121000000
CY2015	us-gaap	Interest Paid Net InterestPaidNet	270000000
CY2015	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	106000000
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-384000000
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	875000000
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-162000000
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-863000000
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	124000000
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-42000000
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-705000000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-80000000
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1611000000
CY2015	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	780000000
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	826000000
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	98000000
CY2015	us-gaap	Other Restructuring Costs OtherRestructuringCosts	92000000
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-41000000
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2000000
CY2015	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	63000000
CY2015	us-gaap	Payments For Restructuring PaymentsForRestructuring	66000000
CY2015	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-70000000
CY2015	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	106000000
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	391000000
CY2015	us-gaap	Pension Contributions PensionContributions	69000000
CY2015	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	2000000
CY2015	us-gaap	Profit Loss ProfitLoss	-739000000
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	24000000
CY2015	us-gaap	Restructuring Charges RestructuringCharges	983000000
CY2015	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	69000000
CY2015	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	266000000
CY2015	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	1078000000
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	11199000000
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	35000000
CY2015	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	353000000
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.47
CY2015	us-gaap	Severance Costs1 SeveranceCosts1	199000000
CY2015	us-gaap	Stockholders Equity Other StockholdersEquityOther	-2000000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2000000
CY2015	us-gaap	Translation Adjustment Functional To Reporting Currency Increase Decrease Gross Of Tax TranslationAdjustmentFunctionalToReportingCurrencyIncreaseDecreaseGrossOfTax	-13000000
CY2015	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-26000000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2000000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000
CY2015	us-gaap	Unrecorded Unconditional Purchase Obligation Purchases UnrecordedUnconditionalPurchaseObligationPurchases	125000000
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	182000000	shares
CY2015	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	148000000
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	182471195	shares
CY2015	aa	Change In Valuation Allowance Related To Deferred State Income Taxes ChangeInValuationAllowanceRelatedToDeferredStateIncomeTaxes	-30000000
CY2015	aa	Adjusted Ebitda AdjustedEbitda	2179000000
CY2015	aa	Unrecognized Tax Benefits Increases Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromForeignCurrencyTranslation	-4000000
CY2015	aa	Valuation Allowance Additions ValuationAllowanceAdditions	141000000
CY2015	aa	Segment Reporting Information Corporate Expenses SegmentReportingInformationCorporateExpenses	173000000
CY2015	aa	Deferred Tax Assets Valuation Foreign Currency Translation DeferredTaxAssetsValuationForeignCurrencyTranslation	33000000
CY2015	aa	Expense Related To Expense Acceleration Of Expense Related To Retirement Eligible Employees ExpenseRelatedToExpenseAccelerationOfExpenseRelatedToRetirementEligibleEmployees	6000000
CY2015	aa	Segment Reporting Information Equity In Net Income Of Equity Method Investees Of Segments SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegments	-85000000
CY2015	aa	Payments For Proceeds From Net Parent Investment PaymentsForProceedsFromNetParentInvestment	34000000
CY2015	aa	Separation Transaction Costs Net Of Tax SeparationTransactionCostsNetOfTax	24000000
CY2015	aa	Segment Reporting Information Metal Price Increase Decrease SegmentReportingInformationMetalPriceIncreaseDecrease	30000000
CY2015	aa	Income Loss From Equity Method Investments Before Reconciling Adjustments IncomeLossFromEquityMethodInvestmentsBeforeReconcilingAdjustments	-60000000
CY2015	aa	Income Loss From Equity Method Investments Reconciling Adjustments IncomeLossFromEquityMethodInvestmentsReconcilingAdjustments	7000000
CY2015	aa	Reclassification Of Amounts Included In Other Reserves ReclassificationOfAmountsIncludedInOtherReserves	17000000
CY2015	aa	Change In Parent Company Net Investment ChangeInParentCompanyNetInvestment	-10000000
CY2015	aa	Additional Charge Related To European Commission Announcement AdditionalChargeRelatedToEuropeanCommissionAnnouncement	34000000
CY2015	aa	Additional Charge Related To European Commission Announcement AdditionalChargeRelatedToEuropeanCommissionAnnouncement	37000000
CY2015	aa	Segment Reporting Information Depreciation Depletion And Amortization Expenses SegmentReportingInformationDepreciationDepletionAndAmortizationExpenses	709000000
CY2015	aa	Accrual For Environmental Loss Contingencies Charges AccrualForEnvironmentalLossContingenciesCharges	24000000
CY2015	aa	Equity Method Investment Summarized Financial Information Income Loss Before Taxes EquityMethodInvestmentSummarizedFinancialInformationIncomeLossBeforeTaxes	125000000
CY2015	aa	Restructuring Reserve Period Expenses RestructuringReservePeriodExpenses	421000000
CY2015	aa	Defined Benefit Pension Plans Net Periodic Benefit Cost DefinedBenefitPensionPlansNetPeriodicBenefitCost	67000000
CY2015	aa	Income Tax Expense Payment Of Interest And Penalties IncomeTaxExpensePaymentOfInterestAndPenalties	1000000
CY2015	aa	Minority Interest Increase Decrease From Capital Contribution From Noncontrolling Interest Holders MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders	2000000
CY2015	aa	Restructuring Charges Legal Settlement RestructuringChargesLegalSettlement	201000000
CY2015	aa	Effective Income Tax Rate Reconciliation Foreign Income Tax Expense EffectiveIncomeTaxRateReconciliationForeignIncomeTaxExpense	-0.209	pure
CY2015	aa	Estimated Percentage Of Compensation Expense In Performance Based Award Payouts EstimatedPercentageOfCompensationExpenseInPerformanceBasedAwardPayouts	0.90	pure
CY2015	aa	Percentage Of Effect Of Unrecognized Tax Benefit If Recorded PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded	0.04	pure
CY2015	aa	Costs And Operating Expenses And Nonoperating Income Expenses CostsAndOperatingExpensesAndNonoperatingIncomeExpenses	11536000000
CY2015	aa	Reversals Of Previously Recorded Layoff And Other Costs ReversalsOfPreviouslyRecordedLayoffAndOtherCosts	7000000
CY2015	aa	Income Loss From Equity Method Investments Nonoperating IncomeLossFromEquityMethodInvestmentsNonoperating	89000000
CY2017	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	5000000
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	40000000
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	10000000
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3000000
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-693000000
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	421000000
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	24000000
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	17000000
CY2017	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	26000000
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	43000000
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	12000000
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	505000000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1159000000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1871000000
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	424000000
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	152000000
CY2017	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	9072000000
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	65000000
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0689	pure
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	70000000
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	24000000
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	176000000
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0
CY2017	us-gaap	Defined Benefit Plan Narrative Description Of Basis Used To Determine Overall Expected Long Term Rate Of Return On Assets Assumption DefinedBenefitPlanNarrativeDescriptionOfBasisUsedToDetermineOverallExpectedLongTermRateOfReturnOnAssetsAssumption	The expected long-term rate of return on plan assets is generally applied to a five-year market-related value of plan assets (a four-year average or the fair value at the plan measurement date is used for certain non-U.S.plans)
CY2017	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2021
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	750000000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	2000000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	79000000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3000000
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	74000000
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.518	pure
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M0D
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Type DocumentType	10-K
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.258	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Holidays EffectiveIncomeTaxRateReconciliationTaxHolidays	0.004	pure
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	13000000
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
CY2017	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	8000000
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	82000000
CY2017	dei	Entity Registrant Name EntityRegistrantName	ALCOA CORP
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	71000000
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	3781000000
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001675149
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.001	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.108	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.014	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.031	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.002	pure
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	4469000000
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-8000000
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	116000000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-712000000
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	363000000
CY2017	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	1000000
CY2017	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-39000000
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	99000000
CY2017	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	2000000	shares
CY2017	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-563000000
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	238000000
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000	shares
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	62000000
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-9000000
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	600000000
CY2017	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.11
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	20000000
CY2017	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	377000000
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	111000000
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-43000000
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	118000000
CY2017	us-gaap	Interest Expense InterestExpense	104000000
CY2017	us-gaap	Interest Costs Incurred InterestCostsIncurred	121000000
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	17000000
CY2017	us-gaap	Interest Paid Net InterestPaidNet	100000000
CY2017	us-gaap	Long Term Contract For Purchase Of Electric Power Description LongTermContractForPurchaseOfElectricPowerDescription	In addition, in January 2017, Alcoa Corporation entered into a new financial contract that hedges the anticipated power requirements at this smelter for the period from August 2017 through July 2021 (see D11 above). At December 31, 2017, this financial contract hedges forecasted electricity purchases of 8,805,456 megawatt hours.
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	342000000
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-226000000
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1224000000
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-506000000
CY2017	us-gaap	Net Income Loss NetIncomeLoss	217000000
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	342000000
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	58000000
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1252000000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	447000000
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	25000000
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	284000000
CY2017	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	752000000
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-1089000000
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	101000000
CY2017	us-gaap	Other Restructuring Costs OtherRestructuringCosts	49000000
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-32000000
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2000000
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	66000000
CY2017	us-gaap	Payments For Restructuring PaymentsForRestructuring	73000000
CY2017	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-245000000
CY2017	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	342000000
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	405000000
CY2017	us-gaap	Pension Contributions PensionContributions	106000000
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	80000000
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-8000000
CY2017	us-gaap	Profit Loss ProfitLoss	559000000
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	21000000
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	243000000
CY2017	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	38000000
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	43000000
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	7000000
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	60000000
CY2017	us-gaap	Restructuring Charges RestructuringCharges	309000000
CY2017	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	32000000
CY2017	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	864000000
CY2017	us-gaap	Sales Revenue Net SalesRevenueNet	11652000000
CY2017	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	10788000000
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	24000000
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y9M25D
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	284000000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.000	pure
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0248	pure
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	12.45
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4068	pure
CY2017	us-gaap	Severance Costs1 SeveranceCosts1	23000000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	24000000
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	11000000
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1704299	shares
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	43000000
CY2017	us-gaap	Stockholders Equity Reverse Stock Split StockholdersEquityReverseStockSplit	ParentCo's stock-based compensation plan to Alcoa Corporation employees, the previously-mentioned fair values were adjusted to reflect both the impact of ParentCo's 1-for-3 reverse stock split that occurred on October 5, 2016 and to maintain the intrinsic value of the stock options as a result of the Separation Transaction.
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000
CY2017	us-gaap	Translation Adjustment Functional To Reporting Currency Increase Decrease Gross Of Tax TranslationAdjustmentFunctionalToReportingCurrencyIncreaseDecreaseGrossOfTax	11000000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5000000
CY2017	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	33000000
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	184000000	shares
CY2017	dei	Trading Symbol TradingSymbol	AA
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-24000000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	6000000
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3000000
CY2017	us-gaap	Unrecorded Unconditional Purchase Obligation Purchases UnrecordedUnconditionalPurchaseObligationPurchases	199000000
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	187000000	shares
CY2017	aa	Adjusted Ebitda AdjustedEbitda	2680000000
CY2017	aa	Estimated Caro Ranges Per Structure Maximum EstimatedCaroRangesPerStructureMaximum	28000000
CY2017	aa	Estimated Caro Ranges Per Structure Minimum EstimatedCaroRangesPerStructureMinimum	3000000
CY2017	aa	Valuation Allowance Additions ValuationAllowanceAdditions	94000000
CY2017	aa	Asset Retirement Obligations Liabilities Settled AssetRetirementObligationsLiabilitiesSettled	69000000
CY2017	aa	Segment Reporting Information Corporate Expenses SegmentReportingInformationCorporateExpenses	136000000
CY2017	aa	Deferred Tax Assets Valuation Foreign Currency Translation DeferredTaxAssetsValuationForeignCurrencyTranslation	-45000000
CY2017	aa	Expense Related To Expense Acceleration Of Expense Related To Retirement Eligible Employees ExpenseRelatedToExpenseAccelerationOfExpenseRelatedToRetirementEligibleEmployees	4000000
CY2017	aa	Segment Reporting Information Equity In Net Income Of Equity Method Investees Of Segments SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegments	-24000000
CY2017	aa	Payment For Separation Transaction PaymentForSeparationTransaction	247000000
CY2017	aa	Segment Reporting Information Metal Price Increase Decrease SegmentReportingInformationMetalPriceIncreaseDecrease	-26000000
CY2017	aa	Income Loss From Equity Method Investments Before Reconciling Adjustments IncomeLossFromEquityMethodInvestmentsBeforeReconcilingAdjustments	-52000000
CY2017	aa	Income Loss From Equity Method Investments Reconciling Adjustments IncomeLossFromEquityMethodInvestmentsReconcilingAdjustments	-10000000
CY2017	aa	Reclassification Of Obligation Transferred On Separation ReclassificationOfObligationTransferredOnSeparation	17000000
CY2017	aa	Reclassification Of Amounts Included In Asset Retirement Obligations ReclassificationOfAmountsIncludedInAssetRetirementObligations	5000000
CY2017	aa	Segment Reporting Information Depreciation Depletion And Amortization Expenses SegmentReportingInformationDepreciationDepletionAndAmortizationExpenses	708000000
CY2017	aa	Segment Reporting Information Capital Expenditures SegmentReportingInformationCapitalExpenditures	375000000
CY2017	aa	Bank Guarantees And Letters Of Credit Outstanding BankGuaranteesAndLettersOfCreditOutstanding	29000000
CY2017	aa	Accrual For Environmental Loss Contingencies Charges AccrualForEnvironmentalLossContingenciesCharges	48000000
CY2017	aa	Equity Method Investment Summarized Financial Information Income Loss Before Taxes EquityMethodInvestmentSummarizedFinancialInformationIncomeLossBeforeTaxes	132000000
CY2017	aa	Restructuring Reserve Period Expenses RestructuringReservePeriodExpenses	90000000
CY2017	aa	Defined Benefit Pension Plans Net Periodic Benefit Cost DefinedBenefitPensionPlansNetPeriodicBenefitCost	111000000
CY2017	aa	Income Tax Expense Payment Of Interest And Penalties IncomeTaxExpensePaymentOfInterestAndPenalties	6000000
CY2017	aa	Minority Interest Increase Decrease From Capital Contribution From Noncontrolling Interest Holders MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders	80000000
CY2017	aa	Minimum Required Cash Contribution To Pension Plan MinimumRequiredCashContributionToPensionPlan	290000000
CY2017	aa	Restructuring Charges Legal Settlement RestructuringChargesLegalSettlement	-22000000
CY2017	aa	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod	1704299	shares
CY2017	aa	Maximum Hedging Contracts Period MaximumHedgingContractsPeriod	P5Y
CY2017	aa	Other Derivative Contracts Estimated Term Of Quoted Market Prices OtherDerivativeContractsEstimatedTermOfQuotedMarketPrices	P10Y
CY2017	aa	No Of Year Over Actual Annual Healthcare Cost Trend Experience NoOfYearOverActualAnnualHealthcareCostTrendExperience	P3Y
CY2017	aa	Cash Equivalents Maximum Maturity Period Of Highly Liquid Investments CashEquivalentsMaximumMaturityPeriodOfHighlyLiquidInvestments	P3M
CY2017	aa	Effective Income Tax Rate Reconciliation Foreign Income Tax Expense EffectiveIncomeTaxRateReconciliationForeignIncomeTaxExpense	0.013	pure
CY2017	aa	Minimum Percentage Of Estimated Fair Value Of Reporting Unit To Be Less Than Carrying Amount Of Goodwill MinimumPercentageOfEstimatedFairValueOfReportingUnitToBeLessThanCarryingAmountOfGoodwill	0.50	pure
CY2017	aa	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Behavior ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExerciseBehavior	0.59	pure
CY2017	aa	Estimated Percentage Of Compensation Expense In Performance Based Award Payouts EstimatedPercentageOfCompensationExpenseInPerformanceBasedAwardPayouts	0.90	pure
CY2017	aa	Percentage Of Effect Of Unrecognized Tax Benefit If Recorded PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded	0.01	pure
CY2017	aa	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Annual Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate	0.06	pure
CY2017	aa	Capacity Closure CapacityClosure	191	kT
CY2017	aa	Idle Capacity Closed IdleCapacityClosed	778	kT
CY2017	aa	Costs And Operating Expenses And Nonoperating Income Expenses CostsAndOperatingExpensesAndNonoperatingIncomeExpenses	10493000000
CY2017	aa	Early Termination Of Power Contract EarlyTerminationOfPowerContract	244000000
CY2017	aa	Reversals Of Previously Recorded Layoff And Other Costs ReversalsOfPreviouslyRecordedLayoffAndOtherCosts	43000000
CY2017	aa	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxBenefit	-51000000
CY2017	aa	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit	22000000
CY2017	aa	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Asset Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense	-506000000
CY2017	aa	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Assets Valuation Allowance TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxAssetsValuationAllowance	-433000000
CY2017	aa	Net Operating Losses Carry Forward Period NetOperatingLossesCarryForwardPeriod	P20Y
CY2017	aa	Net Operating Losses Carryback Period NetOperatingLossesCarrybackPeriod	P2Y
CY2017	aa	Percentage Of Taxable Income Related To Net Operating Losses Carryforward And Carryback Periods PercentageOfTaxableIncomeRelatedToNetOperatingLossesCarryforwardAndCarrybackPeriods	1.00	pure
CY2017	aa	Threshold Percentage Related To Tax Cuts And Jobs Act Of Two Thousand And Seventeen ThresholdPercentageRelatedToTaxCutsAndJobsActOfTwoThousandAndSeventeen	0.03	pure
CY2017	aa	Income Loss From Equity Method Investments Nonoperating IncomeLossFromEquityMethodInvestmentsNonoperating	28000000
CY2017	aa	Tax Cuts And Jobs Act Of2017 Remeasurement Of Deferred Tax Expense TaxCutsAndJobsActOf2017RemeasurementOfDeferredTaxExpense	0.019	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2018	aa	Income Tax Rate On Global Intangible Low Tax Income Related To Earnings Taxed At Low Rate Of Foreign Entities Without Significant Fixed Asset Base IncomeTaxRateOnGlobalIntangibleLowTaxIncomeRelatedToEarningsTaxedAtLowRateOfForeignEntitiesWithoutSignificantFixedAssetBase	0.105	pure
CY2018	aa	Net Operating Losses Carry Forward Period NetOperatingLossesCarryForwardPeriod	P0Y
CY2018	aa	Net Operating Losses Carryback Period NetOperatingLossesCarrybackPeriod	P0Y
CY2018	aa	Percentage Of Taxable Income Related To Net Operating Losses Carryforward And Carryback Periods PercentageOfTaxableIncomeRelatedToNetOperatingLossesCarryforwardAndCarrybackPeriods	0.80	pure
CY2016	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	24000000
CY2016	us-gaap	Asset Impairment Charges AssetImpairmentCharges	155000000
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	97000000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2000000
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	19000000
CY2016	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	-16000000
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	117000000
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7000000
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	296000000
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-575000000
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	9000000
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	221000000
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	230000000
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-46000000
CY2016	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	7898000000
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	57000000
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-46000000
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0
CY2016	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2020
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	718000000
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	21000000
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-1.136	pure
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.19
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.019	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Holidays EffectiveIncomeTaxRateReconciliationTaxHolidays	0.112	pure
CY2016	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	13000000
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.19
CY2016	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	26000000
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	21000000
CY2016	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	74000000
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	2844000000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.006	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.443	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.073	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.020	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	1.632	pure
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	3507000000
CY2016	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-8000000
CY2016	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	3000000
CY2016	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	164000000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-688000000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-162000000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	526000000
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	265000000
CY2016	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	1000000
CY2016	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	80000000
CY2016	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	184000000
CY2016	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-320000000
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1000000
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	28000000
CY2016	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-48000000
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	184000000
CY2016	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	6000000
CY2016	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-148000000
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	52000000
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	234000000
CY2016	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-1226000000
CY2016	us-gaap	Interest Expense InterestExpense	243000000
CY2016	us-gaap	Interest Costs Incurred InterestCostsIncurred	266000000
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	23000000
CY2016	us-gaap	Interest Paid Net InterestPaidNet	226000000
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	233000000
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	1077000000
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	-311000000
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-483000000
CY2016	us-gaap	Net Income Loss NetIncomeLoss	-400000000
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	54000000
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	89000000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-229000000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	202000000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	315000000
CY2016	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	718000000
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-342000000
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	90000000
CY2016	us-gaap	Other Restructuring Costs OtherRestructuringCosts	47000000
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	16000000
CY2016	us-gaap	Payments For Restructuring PaymentsForRestructuring	109000000
CY2016	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-112000000
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	12000000
CY2016	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	3000000
CY2016	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	233000000
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	404000000
CY2016	us-gaap	Pension Contributions PensionContributions	66000000
CY2016	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	48000000
CY2016	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	146000000
CY2016	us-gaap	Profit Loss ProfitLoss	-346000000
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	10000000
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-4000000
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	34000000
CY2016	us-gaap	Restructuring Charges RestructuringCharges	318000000
CY2016	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	33000000
CY2016	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	177000000
CY2016	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	958000000
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	9318000000
CY2016	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	8360000000
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	28000000
CY2016	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	359000000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.12
CY2016	us-gaap	Severance Costs1 SeveranceCosts1	32000000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4000000
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-3000000
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	10000000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3000000
CY2016	us-gaap	Translation Adjustment Functional To Reporting Currency Increase Decrease Gross Of Tax TranslationAdjustmentFunctionalToReportingCurrencyIncreaseDecreaseGrossOfTax	5000000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2000000
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-9000000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2000000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000
CY2016	us-gaap	Unrecorded Unconditional Purchase Obligation Purchases UnrecordedUnconditionalPurchaseObligationPurchases	181000000
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	183000000	shares
CY2016	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	1056000000
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	183000000	shares
CY2016	aa	Separation Adjustments SeparationAdjustments	1138000000
CY2016	aa	Adjusted Ebitda AdjustedEbitda	1433000000
CY2016	aa	Unrecognized Tax Benefits Increases Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromForeignCurrencyTranslation	1000000
CY2016	aa	Asset Retirement Obligations Liabilities Settled AssetRetirementObligationsLiabilitiesSettled	47000000
CY2016	aa	Segment Reporting Information Corporate Expenses SegmentReportingInformationCorporateExpenses	177000000
CY2016	aa	Deferred Tax Assets Valuation Foreign Currency Translation DeferredTaxAssetsValuationForeignCurrencyTranslation	13000000
CY2016	aa	Expense Related To Expense Acceleration Of Expense Related To Retirement Eligible Employees ExpenseRelatedToExpenseAccelerationOfExpenseRelatedToRetirementEligibleEmployees	7000000
CY2016	aa	Segment Reporting Information Equity In Net Income Of Equity Method Investees Of Segments SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegments	-64000000
CY2016	aa	Payments For Proceeds From Net Parent Investment PaymentsForProceedsFromNetParentInvestment	-802000000
CY2016	aa	Payment For Separation Transaction PaymentForSeparationTransaction	1072000000
CY2016	aa	Establishment Of Defined Benefit Plans Adjustment EstablishmentOfDefinedBenefitPlansAdjustment	-2528000000
CY2016	aa	Segment Reporting Information Metal Price Increase Decrease SegmentReportingInformationMetalPriceIncreaseDecrease	-9000000
CY2016	aa	Income Loss From Equity Method Investments Before Reconciling Adjustments IncomeLossFromEquityMethodInvestmentsBeforeReconcilingAdjustments	-25000000
CY2016	aa	Income Loss From Equity Method Investments Reconciling Adjustments IncomeLossFromEquityMethodInvestmentsReconcilingAdjustments	-3000000
CY2016	aa	Cash Provided As Result Of Separation From Former Parent CashProvidedAsResultOfSeparationFromFormerParent	-1072000000
CY2016	aa	Reclassification Of Obligation Transferred On Separation ReclassificationOfObligationTransferredOnSeparation	60000000
CY2016	aa	Change In Parent Company Net Investment ChangeInParentCompanyNetInvestment	-603000000
CY2016	aa	Segment Reporting Information Depreciation Depletion And Amortization Expenses SegmentReportingInformationDepreciationDepletionAndAmortizationExpenses	677000000
CY2016	aa	Segment Reporting Information Capital Expenditures SegmentReportingInformationCapitalExpenditures	394000000
CY2016	aa	Accrual For Environmental Loss Contingencies Charges AccrualForEnvironmentalLossContingenciesCharges	32000000
CY2016	aa	Equity Method Investment Summarized Financial Information Income Loss Before Taxes EquityMethodInvestmentSummarizedFinancialInformationIncomeLossBeforeTaxes	85000000
CY2016	aa	Restructuring Reserve Period Expenses RestructuringReservePeriodExpenses	200000000
CY2016	aa	Defined Benefit Pension Plans Net Periodic Benefit Cost DefinedBenefitPensionPlansNetPeriodicBenefitCost	66000000
CY2016	aa	Income Tax Expense Payment Of Interest And Penalties IncomeTaxExpensePaymentOfInterestAndPenalties	2000000
CY2016	aa	Minority Interest Increase Decrease From Capital Contribution From Noncontrolling Interest Holders MinorityInterestIncreaseDecreaseFromCapitalContributionFromNoncontrollingInterestHolders	48000000
CY2016	aa	Effective Income Tax Rate Reconciliation Foreign Income Tax Expense EffectiveIncomeTaxRateReconciliationForeignIncomeTaxExpense	-0.195	pure
CY2016	aa	Effective Income Tax Rate Reconciliation Nondeductible Expense Costs Related To Separation Transaction Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCostsRelatedToSeparationTransactionPercent	-0.096	pure
CY2016	aa	Estimated Percentage Of Compensation Expense In Performance Based Award Payouts EstimatedPercentageOfCompensationExpenseInPerformanceBasedAwardPayouts	0.90	pure
CY2016	aa	Percentage Of Effect Of Unrecognized Tax Benefit If Recorded PercentageOfEffectOfUnrecognizedTaxBenefitIfRecorded	0.10	pure
CY2016	aa	Costs And Operating Expenses And Nonoperating Income Expenses CostsAndOperatingExpensesAndNonoperatingIncomeExpenses	9480000000
CY2016	aa	Reversals Of Previously Recorded Layoff And Other Costs ReversalsOfPreviouslyRecordedLayoffAndOtherCosts	36000000
CY2016	aa	Income Loss From Equity Method Investments Nonoperating IncomeLossFromEquityMethodInvestmentsNonoperating	70000000
CY2012	aa	Expanded Capacity Amount Of Processed Bauxite ExpandedCapacityAmountOfProcessedBauxite	100	kT
	aa	Payment For Litigation Settlement Installment Amount PaymentForLitigationSettlementInstallmentAmount	50000000
	aa	Payment For Litigation Settlement Installment Amount PaymentForLitigationSettlementInstallmentAmount	69000000
CY2016Q4	us-gaap	Dividends Common Stock DividendsCommonStock	0
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.21
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.23
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	225000000
CY2017Q1	us-gaap	Profit Loss ProfitLoss	308000000
CY2017Q1	us-gaap	Sales Revenue Net SalesRevenueNet	2655000000
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.16
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.16
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	-210000000
CY2016Q1	us-gaap	Profit Loss ProfitLoss	-215000000
CY2016Q1	us-gaap	Sales Revenue Net SalesRevenueNet	2129000000
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.29
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.29
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	-55000000
CY2016Q2	us-gaap	Profit Loss ProfitLoss	-12000000
CY2016Q2	us-gaap	Sales Revenue Net SalesRevenueNet	2323000000
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	75000000
CY2017Q2	us-gaap	Profit Loss ProfitLoss	138000000
CY2017Q2	us-gaap	Sales Revenue Net SalesRevenueNet	2859000000
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.06
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.06
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	-10000000
CY2016Q3	us-gaap	Profit Loss ProfitLoss	10000000
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	2329000000
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	113000000
CY2017Q3	us-gaap	Profit Loss ProfitLoss	169000000
CY2017Q3	us-gaap	Sales Revenue Net SalesRevenueNet	2964000000
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.68
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.68
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	-125000000
CY2016Q4	us-gaap	Profit Loss ProfitLoss	-129000000
CY2016Q4	us-gaap	Restructuring Charges RestructuringCharges	209000000
CY2016Q4	us-gaap	Sales Revenue Net SalesRevenueNet	2537000000
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.06
CY2017Q4	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.06
CY2017Q4	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	98000000
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	-196000000
CY2017Q4	us-gaap	Profit Loss ProfitLoss	-56000000
CY2017Q4	us-gaap	Restructuring Charges RestructuringCharges	297000000
CY2017Q4	us-gaap	Sales Revenue Net SalesRevenueNet	3174000000

Files In Submission

Name	View Source	Status
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0001193125-18-056314-index.html	Edgar Link	pending
0001193125-18-056314.txt	Edgar Link	pending
0001193125-18-056314-xbrl.zip	Edgar Link	pending
aa-20171231.xml	Edgar Link	completed
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$AA
Alcoa Corp Stock $aa

2017 Q4 Form 10-K Financial Statement

#000119312518056314 Filed on February 26, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AA Alcoa Corp Stock $aa

2017 Q4 Form 10-K Financial Statement

#000119312518056314 Filed on February 26, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AA
Alcoa Corp Stock $aa