(Tables)

12 Months Ended

Oct. 31, 2019

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	141		(117		)

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)	2019		2018		2017
Pension expense	$	232	$	72	$	121
Health and life insurance expense	31		33		(3		)
Total postretirement benefits expense	$	263	$	105	$	118

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)	2019		2018
Projected benefit obligations	$	3,325	$	3,065
Accumulated benefit obligations	3,307		3,051
Fair value of plan assets	1,991		1,865

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)	2019			2018			2019			2018
Change in benefit obligations
Benefit obligations at beginning of year	$	3,344		$	3,799		$	1,245		$	1,435
Service cost	7			7			3			4
Interest on obligations	121			108			49			43
Actuarial loss (gain)	405			(251		)	(138		)	(159		)
Plan amendment	4			—			—			—
Settlements	(263		)	(25		)	—			—
Currency translation	(5		)	(8		)	—			—
Plan participants' contributions	—			—			35			40
Subsidy receipts	—			—			37			42
Benefits paid	(266		)	(286		)	(144		)	(160		)
Benefit obligations at end of year	$	3,347		$	3,344		$	1,087		$	1,245
Change in plan assets
Fair value of plan assets at beginning of year	$	2,162		$	2,363		$	297		$	333
Actual return on plan assets	232			(30		)	20			4
Settlements	(263		)	(25		)	—			—
Currency translation	(5		)	(8		)	—			—
Employer contributions(A)	136			132			1			1
Benefits paid	(249		)	(270		)	(35		)	(41		)
Fair value of plan assets at end of year	$	2,013		$	2,162		$	283		$	297
Funded status at year end	$	(1,334	)	$	(1,182	)	$	(804	)	$	(948	)

Schedule of Expected Benefit Payments [Table Text Block]

The expected future benefit payments for the years ending October 31, 2020 through 2024 and the five years ending October 31, 2029 are estimated as follows:

(in millions)	Pension Benefit Payments		Other Postretirement Benefit Payments(A)
2020	$	258	$	66
2021	253		69
2022	246		73
2023	240		76
2024	233		77
2025 through 2029	1,057		356

________________________

(A)

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

Schedule of Allocation of Plan Assets [Table Text Block]

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

	As of October 31, 2019										As of October 31, 2018
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	8	$	—	$	—	$	—	$	8	$	11	$	—	$	—	$	—	$	11
Fixed Income
U.S. Credit Bonds	—		58		—		—		58		—		61		—		—		61
Corporate and Government Bonds	—		—		—		—		—		—		—		—		—		—
Government Bonds	—		—		—		—		—		—		—		—		—		—
Collective Trusts and Other
U.S. Equity	58		—		—		—		58		59		—		—		—		59
International Equity	57		—		—		—		57		59		—		—		—		59
Fixed Income - Multi-Asset Credit	9		19		—		—		28		9		17		—		—		26
Real Estate (REITs)	—		—		—		26		26		—		—		—		26		26
Mutual Fund	—		—		—		—		—		—		—		—		—		—
Insurance Linked Securities	—		—		—		6		6		—		—		—		8		8
Hedge Fund of Funds	—		—		—		37		37		—		—		—		39		39
Private Equity	—		—		—		5		5		—		—		—		8		8
Total	$	132	$	77	$	—	$	74	$	283	$	138	$	78	$	—	$	81	$	297

Pension Assets

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

	As of October 31, 2019										As of October 31, 2018
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	68	$	—	$	—	$	—	$	68	$	77	$	—	$	—	$	—	$	77
Collective Trusts and Other
U.S. Equity	281		—		—		—		281		293		—		—		—		293
Canadian Equity	—		—		—		—		—		16		—		—		—		16
International Equity	283		—		—		—		283		270		—		—		—		270
Global Equity	219		—		—		—		219		205		—		—		—		205
Fixed Income - Long Duration Credit	—		296		—		—		296		—		283		—		—		283
Fixed Income - Long Duration Government	—		173		—		—		173		—		156		—		—		156
Fixed Income - Intermediate Duration Government	—		79		—		—		79		—		48		—		—		48
Fixed Income - High Yield	—		154		—		—		154		—		157		—		—		157
Fixed Income - Canadian Bond	—		20		—		—		20		—		194		—		—		194
Global Real Estate	—		138		—		—		138		—		135		—		—		135
Global Infrastructure	—		—		—		—		—		—		—		—		9		9
Insurance linked Securities	—		—		—		34		34		—		—		—		45		45
Hedge Fund of Funds	—		—		—		187		187		—		—		—		202		202
Private Equity	—		—		—		23		23		—		—		—		32		32
Private Credit	—		—		—		47		47		—		—		—		22		22
Real Estate	—		—		—		9		9		—		—		—		—		—
Total(A)	$	851	$	860	$	—	$	300	$	2,011	$	861	$	973	$	—	$	310	$	2,144

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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, 2019 and 2018, respectively, while the change in the plan asset table includes the fair value of Canadian pension assets translated at historical foreign currency rates.

Schedule of Net Benefit Costs [Table Text Block]

	For the Years Ended October 31,
	Pension Benefits									Health and Life Insurance Benefits
(in millions)	2019			2018			2017			2019			2018			2017
Service cost for benefits earned during the period	$	7		$	7		$	7		$	3		$	4		$	5
Interest on obligation	121			108			107			49			43			47
Amortization of cumulative loss (gain)	94			106			116			(1		)	9			22
Settlements	143			9			23			—			—			—
Contractual termination benefits	—			—			10			—			—			4
Curtailments and other	—			—			—			—			—			(58		)
Premiums on pension insurance	10			3			15			—			—			—
Expected return on assets	(143		)	(161		)	(157		)	(20		)	(23		)	(23		)
Net periodic benefit expense	$	232		$	72		$	121		$	31		$	33		$	(3	)
Other Changes in plan assets and benefit obligations recognized in other comprehensive loss (income)
Actuarial net loss (gain)	$	316		$	(61	)	$	(116	)	$	(138	)	$	(139	)	$	(197	)
Prior service cost	4			—			—			—			—			—
Amortization of cumulative (loss) gain	(94		)	(106		)	(116		)	1			(9		)	(22		)
Settlements	(143		)	(9		)	(23		)	—			—			—
Curtailments	—			—			(2		)	—			—			—
Total recognized in other comprehensive income	$	83		$	(176	)	$	(257	)	$	(137	)	$	(148	)	$	(219	)
Total net postretirement benefits (income) expense and other comprehensive loss (income)	$	315		$	(104	)	$	(136	)	$	(106	)	$	(115	)	$	(222	)

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)	$	1	$	—
Amortization of cumulative losses/(gains)	97		(1		)

	Pension Benefits						Health and Life Insurance Benefits
(in millions)	2019			2018			2019			2018
Amounts recognized in our Consolidated Balance Sheets consist of:
Noncurrent asset	$	3		$	18		$	—		$	—
Current liability	(18		)	(17		)	(20		)	(34		)
Noncurrent liability	(1,319		)	(1,183		)	(784		)	(914		)
Net liability recognized	$	(1,334	)	$	(1,182	)	$	(804	)	$	(948	)
Amounts recognized in our accumulated other comprehensive loss consist of:
Net actuarial loss (gain)	$	2,086		$	2,007		$	(33	)	$	104
Net prior service cost	4			—			—			—
Net amount recognized	$	2,090		$	2,007		$	(33	)	$	104

Schedule of Assumptions Used [Table Text Block]

Assumptions

The weighted average rate assumptions used in determining benefit obligations for the years ended October 31, 2019 and 2018 are:

	Pension Benefits				Health and Life Insurance Benefits
	2019		2018		2019		2018
Discount rate used to determine present value of benefit obligation at end of year	3.1	%	4.4	%	3.1	%	4.4	%
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 2019, 2018, and 2017 were:

	Pension Benefits						Health and Life Insurance Benefits
	2019		2018		2017		2019		2018		2017
Discount rate used to determine service cost	4.6	%	3.9	%	3.9	%	4.6	%	3.9	%	4.0	%
Discount rate used to determine interest cost	4.0	%	3.0	%	2.8	%	4.1	%	3.1	%	2.9	%
Expected long-term rate of return on plan assets	7.4	%	7.2	%	7.2	%	7.5	%	7.5	%	7.5	%
Expected rate of increase in future compensation levels	3.5	%	3.5	%	3.5	%	—		—		—