1.0.0.3 false Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Millions false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 5 Cash flows from operating activities: 3 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 6 Net income 4 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 706000000 706 false false 2 true true 629000000 629 false false No definition available. No authoritative reference available. false 7 Adjustments to reconcile net cash provided by (used in) operating activities : 4 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 8 Depreciation and amortization 5 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 25000000 25 false false 2 false true 25000000 25 false false No definition available. No authoritative reference available. false 9 Deferred income taxes 5 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 84000000 84 false false No definition available. No authoritative reference available. false 10 Share-based compensation 5 us-gaap_ShareBasedCompensation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 4000000 4 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. false 11 Changes in operating assets and liabilities: 4 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 12 Accounts receivable 5 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 23000000 23 false false 2 false true -13000000 -13 false false No definition available. No authoritative reference available. false 13 Inventories 5 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -42000000 -42 false false 2 false true -38000000 -38 false false No definition available. No authoritative reference available. false 14 Accounts payable and accrued liabilities 5 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 38000000 38 false false 2 false true 12000000 12 false false No definition available. No authoritative reference available. false 15 Settlement costs 5 lo_IncreaseDecreaseSettlementCostsLegal lo false debit duration monetary The net change during the reporting period in the amount of settlement costs. false false false false false false false false false 1 false true -89000000 -89 false false 2 false true -24000000 -24 false false The net change during the reporting period in the amount of settlement costs. No authoritative reference available. false 16 Income taxes 5 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -84000000 -84 false false 2 false true 56000000 56 false false No definition available. No authoritative reference available. false 17 Other assets 5 us-gaap_IncreaseDecreaseInOtherOperatingAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 4000000 4 false false 2 false true 5000000 5 false false No definition available. No authoritative reference available. false 18 Postretirement health and life insurance benefits 5 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -10000000 -10 false false 2 false true -8000000 -8 false false No definition available. No authoritative reference available. false 19 Other 5 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 10000000 10 false false 2 false true -2000000 -2 false false No definition available. No authoritative reference available. true 20 Net cash provided by operating activities 4 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 585000000 585 false false 2 false true 728000000 728 false false No definition available. No authoritative reference available. true 21 Cash flows from investing activities: 3 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 22 Purchases of investments 4 us-gaap_PaymentsToAcquireInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -800000000 -800 false false No definition available. No authoritative reference available. false 23 Proceeds from maturities of investments 4 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 500000000 500 false false No definition available. No authoritative reference available. false 24 Proceeds from sales of investments 4 us-gaap_ProceedsFromSaleOfShortTermInvestments us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 528000000 528 false false No definition available. No authoritative reference available. false 25 Additions to plant and equipment 4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -39000000 -39 false false 2 false true -35000000 -35 false false No definition available. No authoritative reference available. true 26 Net cash (used in)/provided by investing activities 4 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -39000000 -39 false false 2 false true 193000000 193 false false No definition available. No authoritative reference available. true 27 Cash flows from financing activities: 3 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 28 Dividends paid 4 us-gaap_DividendsCommonStockCash us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -473000000 -473 false false 2 false true -649000000 -649 false false No definition available. No authoritative reference available. false 29 Shares repurchased 4 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -502000000 -502 false false 2 false true -274000000 -274 false false No definition available. No authoritative reference available. false 30 Proceeds from issuance of long-term debt 4 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 750000000 750 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 31 Debt issuance costs 4 us-gaap_PaymentsOfDebtIssuanceCosts us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -5000000 -5 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 32 Excess tax benefits from share-based arrangements 4 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 7000000 7 false false 2 false true 0 0 false false No definition available. No authoritative reference available. true 33 Net cash used in financing activities 4 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -223000000 -223 false false 2 false true -923000000 -923 false false No definition available. No authoritative reference available. true 34 Change in cash and cash equivalents 3 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 323000000 323 false false 2 false true -2000000 -2 false false No definition available. No authoritative reference available. false 35 Cash and cash equivalents, beginning of year 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 1191000000 1191 false false 2 false true 1210000000 1210 false false No definition available. No authoritative reference available. false 36 Cash and cash equivalents, end of period 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 1514000000 1514 false false 2 false true 1208000000 1208 false false No definition available. No authoritative reference available. false 37 Cash paid for income taxes 3 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 478000000 478 false false 2 true true 266000000 266 false false No definition available. No authoritative reference available. true false 2 33 false Millions UnKnown UnKnown false true