| **Consolidated Statements of Cash Flows (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                              |
|------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------|
||
| **Cash flows from operating activities**                                                 |                                                                        |   |
| Net income (loss)                                                                        | $ (33)us-gaap_ProfitLoss                                                    | $ (239)us-gaap_ProfitLoss |
| **Adjustments to reconcile net loss to net cash used in operating activities:**          |                                                                        |   |
| Depreciation and amortization                                                            | 58nav_DepreciationExcludingPropertyOnOperatingLeases                        | 55nav_DepreciationExcludingPropertyOnOperatingLeases |
| Depreciation of equipment leased to others                                               | 21nav_DepreciationOfPropertyOnOperatingLeases                               | 31nav_DepreciationOfPropertyOnOperatingLeases |
| Deferred taxes, including change in valuation allowance                                  | (12)nav_DeferredIncomeTaxExpenseBenefitExcludingReclassifications           | (18)nav_DeferredIncomeTaxExpenseBenefitExcludingReclassifications |
| Asset impairment charges                                                                 | 7us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill                      | 18us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill |
| Amortization of debt issuance costs and discount                                         | 9us-gaap_AmortizationOfFinancingCostsAndDiscounts                           | 14us-gaap_AmortizationOfFinancingCostsAndDiscounts |
| Stock-based compensation                                                                 | 2us-gaap_ShareBasedCompensation                                             | 5us-gaap_ShareBasedCompensation |
| Provision for doubtful accounts, net of recoveries                                       | (3)us-gaap_ProvisionForDoubtfulAccounts                                     | 2us-gaap_ProvisionForDoubtfulAccounts |
| Equity in income of non-consolidated affiliates, net of dividends                        | 5us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | 2us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions |
| Other non-cash operating activities                                                      | (11)us-gaap_OtherOperatingActivitiesCashFlowStatement                       | (9)us-gaap_OtherOperatingActivitiesCashFlowStatement |
| Changes in other assets and liabilities, exclusive of the effects of businesses disposed | (254)us-gaap_IncreaseDecreaseInOperatingCapital                             | 46us-gaap_IncreaseDecreaseInOperatingCapital |
| Net cash used in operating activities                                                    | (211)us-gaap_NetCashProvidedByUsedInOperatingActivities                     | (93)us-gaap_NetCashProvidedByUsedInOperatingActivities |
| **Cash flows from investing activities**                                                 |                                                                        |   |
| Purchases of marketable securities                                                       | (140)us-gaap_PaymentsToAcquireMarketableSecurities                          | (378)us-gaap_PaymentsToAcquireMarketableSecurities |
| Sales of marketable securities                                                           | 507nav_ProceedsfromSaleofMarketableSecurities                               | 521nav_ProceedsfromSaleofMarketableSecurities |
| Maturities of marketable securities                                                      | 63nav_ProceedsfromMaturitiesofMarketableSecurities                          | 57nav_ProceedsfromMaturitiesofMarketableSecurities |
| Net change in restricted cash and cash equivalents                                       | 53us-gaap_IncreaseDecreaseInRestrictedCash                                  | (24)us-gaap_IncreaseDecreaseInRestrictedCash |
| Capital expenditures                                                                     | (17)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment                      | (21)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
| Purchases of equipment leased to others                                                  | (10)us-gaap_PaymentsToAcquireEquipmentOnLease                               | (49)us-gaap_PaymentsToAcquireEquipmentOnLease |
| Proceeds from sales of property and equipment                                            | 1us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment                        | 10us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |
| Investments in non-consolidated affiliates                                               | 0us-gaap_PaymentsToAcquireEquityMethodInvestments                           | (2)us-gaap_PaymentsToAcquireEquityMethodInvestments |
| Net cash provided by investing activities                                                | 457us-gaap_NetCashProvidedByUsedInInvestingActivities                       | 114us-gaap_NetCashProvidedByUsedInInvestingActivities |
| **Cash flows from financing activities**                                                 |                                                                        |   |
| Proceeds from issuance of securitized debt                                               | 250us-gaap_ProceedsFromIssuanceOfSecuredDebt                                | 82us-gaap_ProceedsFromIssuanceOfSecuredDebt |
| Principal payments on securitized debt                                                   | (267)us-gaap_RepaymentsOfSecuredDebt                                        | (94)us-gaap_RepaymentsOfSecuredDebt |
| Proceeds from issuance of non-securitized debt                                           | 35us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt                           | 47us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt |
| Principal payments on non-securitized debt                                               | (78)us-gaap_RepaymentsOfOtherLongTermDebt                                   | (53)us-gaap_RepaymentsOfOtherLongTermDebt |
| Net decrease in notes and debt outstanding under revolving credit facilities             | (43)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit                           | (197)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit |
| Principal payments under financing arrangements and capital lease obligations            | 0us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations                         | (4)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations |
| Debt issuance costs                                                                      | (4)us-gaap_PaymentsOfDebtIssuanceCosts                                      | (3)us-gaap_PaymentsOfDebtIssuanceCosts |
| Proceeds from financed lease obligations                                                 | 10nav_ProceedsFromFinanceLeaseObligations                                   | 20nav_ProceedsFromFinanceLeaseObligations |
| Proceeds from exercise of stock options                                                  | 0us-gaap_ProceedsFromStockOptionsExercised                                  | 16us-gaap_ProceedsFromStockOptionsExercised |
| Dividends paid by subsidiaries to non-controlling interest                               | (12)us-gaap_PaymentsOfDividendsMinorityInterest                             | (20)us-gaap_PaymentsOfDividendsMinorityInterest |
| Net cash used in financing activities                                                    | (109)us-gaap_NetCashProvidedByUsedInFinancingActivities                     | (206)us-gaap_NetCashProvidedByUsedInFinancingActivities |
| Effect of exchange rate changes on cash and cash equivalents                             | (14)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents                    | (21)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |
| Increase (decrease) in cash and cash equivalents                                         | 123us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease                     | (206)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
| Cash and cash equivalents at beginning of the period                                     | 497us-gaap_CashAndCashEquivalentsAtCarryingValue                            | 755us-gaap_CashAndCashEquivalentsAtCarryingValue |
| Cash and cash equivalents at end of the period                                           | $ 620us-gaap_CashAndCashEquivalentsAtCarryingValue                          | $ 549us-gaap_CashAndCashEquivalentsAtCarryingValue |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations, excluding reclassifications.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets, EXCLUSIVE of depreciation of equipment leased to others.
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No definition available.
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The aggregate expense recognized in the current period that allocates the cost of rented equipment recorded as an asset to periods that benefit from the lease of the assets.
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| - Definition
Proceeds from finance lease obligations
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| - Definition
Proceeds from Maturities of Marketable Securities
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| - Definition
Proceeds from Sale of Marketable Securities
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| - Definition
Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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| - Definition
Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.
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| - Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.
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| - Definition
This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.
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| - Definition
The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
+ References
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| - Definition
Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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No definition available.
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| - Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.
+ References
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| - Definition
Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for payments to acquire rented equipment which is recorded as an asset.
+ References
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| - Definition
The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
+ References
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