(Tables)

12 Months Ended

Oct. 31, 2018

Retirement Benefits [Abstract]

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

The effect of changing the health care cost trend rate by one-percentage point for each future year is as follows:

(in millions)	One-Percentage Point Increase		One-Percentage Point Decrease
Effect on total of service and interest cost components	$	8	$	(7	)
Effect on postretirement benefit obligation	169		(143		)

Components Of Postretirement Benefits Income Expense Included in Statement Of Operations [Table Text Block]

The components of our postretirement benefits expense included in our Consolidated Statements of Operations consist of the following:

	For the Years Ended October 31,
(in millions)	2018		2017			2016
Pension expense	$	72	$	121		$	82
Health and life insurance expense	33		(3		)	71
Total postretirement benefits expense	$	105	$	118		$	153

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

Information for pension plans with accumulated benefit obligations in excess of plan assets were as follows:

	As of October 31,
(in millions)	2018		2017
Projected benefit obligations	$	3,065	$	3,487
Accumulated benefit obligations	3,051		3,471
Fair value of plan assets	1,865		2,035

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

A summary of the changes in benefit obligations and plan assets is as follows:

	Pension Benefits						Health and Life Insurance Benefits
(in millions)	2018			2017			2018			2017
Change in benefit obligations
Benefit obligations at beginning of year	$	3,799		$	4,027		$	1,435		$	1,708
Service cost	7			7			4			5
Interest on obligations	108			107			43			47
Actuarial loss (gain)	(251		)	(18		)	(159		)	(183		)
Settlements	(25		)	(52		)	—			—
Contractual termination benefits	—			10			—			4
Curtailments and other	—			(2		)	—			(58		)
Currency translation	(8		)	17			—			—
Plan participants' contributions	—			—			40			36
Subsidy receipts	—			—			42			42
Benefits paid	(286		)	(297		)	(160		)	(166		)
Benefit obligations at end of year	$	3,344		$	3,799		$	1,245		$	1,435
Change in plan assets
Fair value of plan assets at beginning of year	$	2,363		$	2,310		$	333		$	333
Actual return on plan assets	(30		)	256			4			38
Settlements	(25		)	(52		)	—			—
Currency translation	(8		)	18			—			—
Employer contributions	132			112			1			2
Benefits paid	(270		)	(281		)	(41		)	(40		)
Fair value of plan assets at end of year	$	2,162		$	2,363		$	297		$	333
Funded status at year end	$	(1,182	)	$	(1,436	)	$	(948	)	$	(1,102	)

Schedule of Expected Benefit Payments [Table Text Block]

The expected future benefit payments for the years ending October 31, 2019 through 2023 and the five years ending October 31, 2028 are estimated as follows:

(in millions)	Pension Benefit Payments		Other Postretirement Benefit Payments(A)
2019	$	283	$	76
2020	278		85
2021	271		91
2022	264		93
2023	257		95
2024 through 2028	1,173		454

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(A) Payments are net of expected participant contributions and expected federal subsidy receipts.

Schedule of Allocation of Plan Assets [Table Text Block]

Pension Assets

The fair value of the pension plan assets by category is summarized below:

	As of October 31, 2018										As of October 31, 2017
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	77	$	—	$	—	$	—	$	77	$	86	$	—	$	—	$	—	$	86
Collective Trusts and Other
U.S. Equity	293		—		—		—		293		316		—		—		—		316
Canadian Equity	16		—		—		—		16		19		—		—		—		19
International Equity	270		—		—		—		270		327		—		—		—		327
Global Equity	205		—		—		—		205		235		—		—		—		235
Fixed Income - Long Duration Credit	—		283		—		—		283		—		508		—		—		508
Fixed Income - Long Duration Government	—		156		—		—		156		—		20		—		—		20
Fixed Income - Intermediate Duration Government	—		48		—		—		48		—		—		—		—		—
Fixed Income - High Yield	—		157		—		—		157		—		214		—		—		214
Fixed Income - Canadian Bond	—		194		—		—		194		—		213		—		—		213
Global Real Estate	—		135		—		—		135		—		144		—		—		144
Global Infrastructure	—		—		—		9		9		—		—		—		10		10
Insurance linked Securities	—		—		—		45		45		—		—		—		—		—
Hedge Fund of Funds	—		—		—		202		202		—		—		—		210		210
Private Equity	—		—		—		32		32		—		—		—		43		43
Private Credit	—		—		—		22		22		—		—		—		—		—
Real Estate	—		—		—		—		—		—		—		1		—		1
Total(A)	$	861	$	973	$	—	$	310	$	2,144	$	983	$	1,099	$	1	$	263	$	2,346

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(A) In addition, the table above includes the fair value of Canadian pension assets translated at the exchange rates as of October 31, 2018 and 2017, respectively, while the change in plan asset table includes the fair value of Canadian pension assets translated at historical foreign currency rates.

The fair value of other postretirement benefit plan assets by category is summarized below:

	As of October 31, 2018										As of October 31, 2017
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	11	$	—	$	—	$	—	$	11	$	6	$	—	$	—	$	—	$	6
Fixed Income
U.S. Credit Bonds	—		61		—		—		61		—		—		—		—		—
Corporate and Government Bonds	—		—		—		—		—		—		62		—		—		62
Government Bonds	—		—		—		—		—		—		8		—		—		8
Collective Trusts and Other
U.S. Equity	59		—		—		—		59		71		—		—		—		71
International Equity	59		—		—		—		59		74		—		—		—		74
Fixed Income - Multi-Asset Credit	9		17		—		—		26		—		29		—		—		29
Real Estate (REITs)	—		—		—		26		26		—		—		—		24		24
Mutual Fund	—		—		—		—		—		9		—		—		—		9
Insurance Linked Securities	—		—		—		8		8		—		—		—		—		—
Hedge Fund of Funds	—		—		—		39		39		—		—		—		39		39
Private Equity	—		—		—		8		8		—		—		—		11		11
Total	$	138	$	78	$	—	$	81	$	297	$	160	$	99	$	—	$	74	$	333

Schedule of Net Benefit Costs [Table Text Block]

	For the Years Ended October 31,
	Pension Benefits									Health and Life Insurance Benefits
(in millions)	2018			2017			2016			2018			2017			2016
Service cost for benefits earned during the period	$	7		$	7		$	9		$	4		$	5		$	5
Interest on obligation	108			107			118			43			47			58
Amortization of cumulative loss	106			116			104			9			22			31
Amortization of prior service cost (benefit)	—			—			—			—			—			(1		)
Settlements	9			23			—			—			—			—
Contractual termination benefits	—			10			3			—			4			4
Curtailments and other	—			—			—			—			(58		)	—
Premiums on pension insurance	3			15			15			—			—			—
Expected return on assets	(161		)	(157		)	(167		)	(23		)	(23		)	(26		)
Net periodic benefit expense	$	72		$	121		$	82		$	33		$	(3	)	$	71
Other Changes in plan assets and benefit obligations recognized in other comprehensive loss (income)
Actuarial net loss (gain)	$	(61	)	$	(116	)	$	313		$	(139	)	$	(197	)	$	(115	)
Amortization of cumulative loss	(106		)	(116		)	(104		)	(9		)	(22		)	(31		)
Amortization of prior service benefit (cost)	—			—			—			—			—			1
Settlements	(9		)	(23		)	—			—			—			—
Curtailments	—			(2		)	—			—			—			—
Currency translation	—			—			(1		)	—			—			—
Total recognized in other comprehensive loss (income)	$	(176	)	$	(257	)	$	208		$	(148	)	$	(219	)	$	(145	)
Total net postretirement benefits (income) expense and other comprehensive loss (income)	$	(104	)	$	(136	)	$	290		$	(115	)	$	(222	)	$	(74	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The estimated amounts for the defined benefit pension plans and the other postretirement benefit plans that will be amortized from AOCL into net periodic benefit expense over the next fiscal year are as follows:

(in millions)	Pension Benefits		Health and Life Insurance Benefits
Amortization of prior service cost (benefit)	$	—	$	—
Amortization of cumulative losses/(gains)	98		(1		)

	Pension Benefits						Health and Life Insurance Benefits
(in millions)	2018			2017			2018			2017
Amounts recognized in our Consolidated Balance Sheets consist of:
Noncurrent asset	$	18		$	16		$	—		$	—
Current liability	(17		)	(16		)	(34		)	(41		)
Noncurrent liability	(1,183		)	(1,436		)	(914		)	(1,061		)
Net liability recognized	$	(1,182	)	$	(1,436	)	$	(948	)	$	(1,102	)
Amounts recognized in our accumulated other comprehensive loss consist of:
Net actuarial loss	$	2,007		$	2,183		$	104		$	252
Net prior service benefit	—			—			—			—
Net amount recognized	$	2,007		$	2,183		$	104		$	252

Schedule of Assumptions Used [Table Text Block]

Assumptions

The weighted average rate assumptions used in determining benefit obligations for the years ended October 31, 2018 and 2017 are:

	Pension Benefits				Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate used to determine present value of benefit obligation at end of year	4.4	%	3.5	%	4.4	%	3.6	%
Expected rate of increase in future compensation levels	3.5	%	3.5	%	—		—

The weighted average rate assumptions used in determining net postretirement benefits expense for 2018, 2017, and 2016 were:

	Pension Benefits						Health and Life Insurance Benefits
	2018		2017		2016		2018		2017		2016
Discount rate used to determine service cost	3.9	%	3.9	%	4.5	%	3.9	%	4.0	%	4.6	%
Discount rate used to determine interest cost	3.0	%	2.8	%	3.1	%	3.1	%	2.9	%	3.3	%
Expected long-term rate of return on plan assets	7.2	%	7.2	%	7.5	%	7.5	%	7.5	%	7.5	%
Expected rate of increase in future compensation levels	3.5	%	3.5	%	3.5	%	—		—		—