1.0.0.3 false Consolidated Condensed Statements of Cash Flows (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 470000000 470 false false 2 true true 391000000 391 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_AdjustmentsForNoncashItemsIncludedInIncomeLossFromContinuingOperationsAbstract 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 17000000 17 false false 2 false true 17000000 17 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 1000000 1 false false 2 false true 87000000 87 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 2000000 2 false false 2 false true 1000000 1 false false No definition available. No authoritative reference available. false 11 Investment income 5 us-gaap_OtherNoncashIncome 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 1000000 1 false false No definition available. No authoritative reference available. false 12 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 13 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 -4000000 -4 false false 2 false true -16000000 -16 false false No definition available. No authoritative reference available. false 14 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 -71000000 -71 false false 2 false true -71000000 -71 false false No definition available. No authoritative reference available. false 15 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 123000000 123 false false 2 false true 40000000 40 false false No definition available. No authoritative reference available. false 16 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 -370000000 -370 false false 2 false true -315000000 -315 false false The net change during the reporting period in the amount of settlement costs. No authoritative reference available. false 17 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 -69000000 -69 false false 2 false true 136000000 136 false false No definition available. No authoritative reference available. false 18 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 -2000000 -2 false false 2 false true 1000000 1 false false No definition available. No authoritative reference available. false 19 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 -11000000 -11 false false 2 false true -10000000 -10 false false No definition available. No authoritative reference available. false 20 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 6000000 6 false false 2 false true -2000000 -2 false false No definition available. No authoritative reference available. true 21 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 92000000 92 false false 2 false true 260000000 260 false false No definition available. No authoritative reference available. true 22 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 23 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 24 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 497000000 497 false false No definition available. No authoritative reference available. false 25 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 500000000 500 false false No definition available. No authoritative reference available. false 26 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 -20000000 -20 false false 2 false true -18000000 -18 false false No definition available. No authoritative reference available. true 27 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 -20000000 -20 false false 2 false true 179000000 179 false false No definition available. No authoritative reference available. true 28 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 29 Dividends paid 4 us-gaap_PaymentsOfDividends us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -309000000 -309 false false 2 false true -491000000 -491 false false No definition available. No authoritative reference available. false 30 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 -146000000 -146 false false 2 false true 0 0 false false No definition available. No authoritative reference available. false 31 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 32 Debt issuance cost 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 33 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 5000000 5 false false 2 false true 0 0 false false No definition available. No authoritative reference available. true 34 Net cash provided by/(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 295000000 295 false false 2 false true -491000000 -491 false false No definition available. No authoritative reference available. true 35 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 367000000 367 false false 2 false true -52000000 -52 false false No definition available. No authoritative reference available. false 36 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 37 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 1558000000 1558 false false 2 false true 1158000000 1158 false false No definition available. No authoritative reference available. false 38 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 345000000 345 false false 2 true true 37000000 37 false false No definition available. No authoritative reference available. true false 2 34 false Millions UnKnown UnKnown false true