Postretirement Benefits - Schedule of Net Benefit (Details) employees in Thousands, $ in Millions	12 Months Ended
Oct. 31, 2020 USD ($) employees	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 3,200	$ 3,300
Number Of Former Employees And Their Beneficiaries Included In Retiree Population \| employees	25
Net postretirement benefits expense	$ 74	263	$ 105
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(2)	(11)	(2)
Fair value of plan assets - Intermediate duration government	22	79
Liability, Defined Benefit Plan, Noncurrent	$ (1,705)	(2,103)
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation	10.10%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 35	140
Assets for Plan Benefits, Defined Benefit Plan	5	3
Defined Benefit Plan, Benefit Obligation	3,242	3,347	3,344
Service cost	(8)	(7)	(7)
Interest on obligations	84	121	108
Amortization of cumulative loss	97	94	106
Amortization of cumulative loss	1	0	0
Premiums on pension insurance	11	10	3
Expected return on assets	(145)	(143)	(161)
Net postretirement benefits expense	63	232	72
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	64	405
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	(4)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	7	143	9
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(1)	(5)
Fair Value of Plan Assets	1,861	2,013	2,162
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	1,860	2,011
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	58	232
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	11	263
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(1)	(5)
Defined Benefit Plan, Plan Assets, Contribution by Employer, Net	35	136
Defined Benefit Plan Change In Fair Value Of Plan Assets Benefits Paid	(233)	(249)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(1,381)	(1,334)
Liability, Defined Benefit Plan, Current	(18)	(18)
Liability, Defined Benefit Plan, Noncurrent	(1,368)	(1,319)
Liability, Defined Benefit Plan	(1,381)	(1,334)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	2,133	2,086
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	3	4
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	2,136	2,090
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	151	316	(61)
Prior Service Cost	0	(4)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(1)	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(97)	(94)	(106)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement, After Tax	7	143	9
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	46	83	(176)
Net postretirement benefit expense (income) and other comprehensive loss (income)	109	315	(104)
Defined Benefit Plan, Plan Assets, Contributions by Employer, Return of Plan Assets		4
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt	0	0
Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	3.10%
Assets for Plan Benefits, Defined Benefit Plan	$ 0	0
Defined Benefit Plan, Benefit Obligation	599	1,087	1,245
Service cost	(3)	(3)	(4)
Interest on obligations	28	49	43
Amortization of cumulative loss	(1)	(1)	9
Amortization of cumulative loss	0	0	0
Premiums on pension insurance	0	0	0
Expected return on assets	(19)	(20)	(23)
Net postretirement benefits expense	11	31	33
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(457)	(138)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	0	0	0
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Fair Value of Plan Assets	252	283	297
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	252	283
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	7	20
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	0	0
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Contribution by Employer, Net	1	1
Defined Benefit Plan Change In Fair Value Of Plan Assets Benefits Paid	(39)	(35)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(347)	(804)
Liability, Defined Benefit Plan, Current	(10)	(20)
Liability, Defined Benefit Plan, Noncurrent	(337)	(784)
Liability, Defined Benefit Plan	(347)	(804)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(478)	(33)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	(478)	(33)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(445)	(138)	(139)
Prior Service Cost	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	0	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	1	1	(9)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement, After Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(444)	(137)	(148)
Net postretirement benefit expense (income) and other comprehensive loss (income)	$ (433)	(106)	$ (115)
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation	80.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	$ 37	35
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt	37	37
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Income Taxes and Other Assets, Noncurrent	197	464
Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	54	851
Fair Value, Inputs, Level 1 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	11	132
Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	1,476	860
Fair Value, Inputs, Level 2 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	176	77
Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	330	300
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	0	0
Fair Value, Inputs, Level 3 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	65	74
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables	0	0
Cash and Cash Equivalents [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	54	68
Cash and Cash Equivalents [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11	8
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	54	68
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11	8
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 3 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Government [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	140	173
Government [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Fair value of plan assets - Intermediate duration government	0	0
Government [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	140	173
Fair value of plan assets - Intermediate duration government	22	79
Government [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Fair value of plan assets - Intermediate duration government	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
U.S. Equity [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	286	281
U.S. Equity [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51	58
U.S. Equity [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	281
U.S. Equity [Member] \| Fair Value, Inputs, Level 1 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	58
U.S. Equity [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	286	0
U.S. Equity [Member] \| Fair Value, Inputs, Level 2 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51	0
U.S. Equity [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
U.S. Equity [Member] \| Fair Value, Inputs, Level 3 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
International Equity Other [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	240	283
International Equity Other [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51	57
International Equity Other [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	283
International Equity Other [Member] \| Fair Value, Inputs, Level 1 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	57
International Equity Other [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	240	0
International Equity Other [Member] \| Fair Value, Inputs, Level 2 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51	0
International Equity Other [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
International Equity Other [Member] \| Fair Value, Inputs, Level 3 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Global Equity [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	211	219
Global Equity [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	219
Global Equity [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	211	0
Global Equity [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Fixed Income, Long Duration Credit [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	320	296
Fixed Income, Long Duration Credit [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Fixed Income, Long Duration Credit [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	320	296
Fixed Income, Long Duration Credit [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Fixed Income, High Yield [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	89	154
Fixed Income, High Yield [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Fixed Income, High Yield [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	89	154
Fixed Income, High Yield [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Fixed Income, Canadian Bond [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11	20
Fixed Income, Canadian Bond [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Fixed Income, Canadian Bond [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11	20
Fixed Income, Canadian Bond [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Global Real Estate [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	157	138
Global Real Estate [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Global Real Estate [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	157	138
Global Real Estate [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	0	0
Commodities Investment [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	24	34
Commodities Investment [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Commodities Investment [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Commodities Investment [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	24	34
Hedge Funds [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	181	187
Hedge Funds [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	37	37
Hedge Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Hedge Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Hedge Funds [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Hedge Funds [Member] \| Fair Value, Inputs, Level 2 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Hedge Funds [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	181	187
Hedge Funds [Member] \| Fair Value, Inputs, Level 3 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	37	37
Private Equity Funds [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	17	23
Private Equity Funds [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	4	5
Private Equity Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Private Equity Funds [Member] \| Fair Value, Inputs, Level 1 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Private Equity Funds [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Private Equity Funds [Member] \| Fair Value, Inputs, Level 2 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Private Equity Funds [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	17	23
Private Equity Funds [Member] \| Fair Value, Inputs, Level 3 [Member] \| Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	4	5
Private Credit [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	89	47
Private Credit [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Private Credit [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Private Credit [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	89	47
Real Estate [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	19	9
Real Estate [Member] \| Fair Value, Inputs, Level 1 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Real Estate [Member] \| Fair Value, Inputs, Level 2 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Real Estate [Member] \| Fair Value, Inputs, Level 3 [Member] \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets	$ 19	$ 9

Defined Benefit Plan, Alternative Investments, Fair Value of Plan Assets

No definition available.

Name:	nav_DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined Benefit Plan Change In Fair Value Of Plan Assets Benefits Paid

+ References

No definition available.

+ Details

Name:	nav_DefinedBenefitPlanChangeInFairValueOfPlanAssetsBenefitsPaid
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables

+ References

No definition available.

+ Details

Name:	nav_DefinedBenefitPlanFairValueOfPlanAssetsExcludingReceivables
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined Benefit Plan, Plan Assets, Contribution by Employer, Net

+ References

No definition available.

+ Details

Name:	nav_DefinedBenefitPlanPlanAssetsContributionbyEmployerNet
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Defined Benefit Plan, Plan Assets, Contributions by Employer, Return of Plan Assets

+ References

No definition available.

+ Details

Name:	nav_DefinedBenefitPlanPlanAssetsContributionsbyEmployerReturnofPlanAssets
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation

+ References

No definition available.

+ Details

Name:	nav_DefinedBenefitPlanWeightedAverageRateOfIncreaseInInPerCapitaCostPercentOfBenefitObligation
Namespace Prefix:	nav_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of plan assets - Intermediate duration government

+ References

No definition available.

+ Details

Name:	nav_FairvalueofplanassetsIntermediatedurationgovernment
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Net postretirement benefit expense (income) and other comprehensive loss (income)

+ References

No definition available.

+ Details

Name:	nav_NetPostretirementBenefitExpenseIncomeAndOtherComprehensiveLossIncome
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number Of Former Employees And Their Beneficiaries Included In Retiree Population

+ References

No definition available.

+ Details

Name:	nav_NumberOfFormerEmployeesAndTheirBeneficiariesIncludedInRetireePopulation
Namespace Prefix:	nav_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement, After Tax

+ References

No definition available.

+ Details

Name:	nav_OtherComprehensiveIncomeLossDefinedBenefitPlanSettlementAfterTax
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Prior Service Cost

+ References

No definition available.

+ Details

Name:	nav_PriorServiceCost
Namespace Prefix:	nav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other assets expected to be realized or consumed after one year or normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanActuarialGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(4)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(5)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(5)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(10))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of (increase) decrease to benefit obligation of defined benefit plan from remeasurement due to settlement. Excludes decrease to benefit obligation for settlement payment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanBenefitObligationPrescriptionDrugSubsidyReceipt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanInterestCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of defined benefit plan cost (credit), classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanOtherCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAmendments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanServiceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919

+ Details

Name:	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919

+ Details

Name:	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanFundingStatusAxis=us-gaap_DomesticPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_GovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_U.S.EquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_InternationalEquityOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_GlobalEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeLongDurationCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeHighYieldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_FixedIncomeCanadianBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_GlobalRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CommoditiesInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=nav_PrivateCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: