(Tables)

12 Months Ended

Oct. 31, 2020

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	$	5	$	(4	)
Effect on postretirement benefit obligation	77		(57		)

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)	2020		2019		2018
Pension expense	$	63	$	232	$	72
Health and life insurance expense	11		31		33
Total postretirement benefits expense	$	74	$	263	$	105

Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess 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)	2020		2019
Projected benefit obligations	$	3,234	$	3,325
Accumulated benefit obligations	3,217		3,307
Fair value of plan assets	1,849		1,991

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)	2020			2019			2020			2019
Change in benefit obligations
Benefit obligations at beginning of year	$	3,347		$	3,344		$	1,087		$	1,245
Service cost	8			7			3			3
Interest on obligations	84			121			28			49
Actuarial loss (gain)	64			405			(457		)	(138		)
Plan amendment	—			4			—			—
Settlements	(11		)	(263		)	—			—
Currency translation	(1		)	(5		)	—			—
Plan participants' contributions	—			—			37			35
Subsidy receipts	—			—			37			37
Benefits paid	(249		)	(266		)	(136		)	(144		)
Benefit obligations at end of year	$	3,242		$	3,347		$	599		$	1,087
Change in plan assets
Fair value of plan assets at beginning of year	$	2,013		$	2,162		$	283		$	297
Actual return on plan assets	58			232			7			20
Settlements	(11		)	(263		)	—			—
Currency translation	(1		)	(5		)	—			—
Employer contributions(A)	35			136			1			1
Benefits paid	(233		)	(249		)	(39		)	(35		)
Fair value of plan assets at end of year	$	1,861		$	2,013		$	252		$	283
Funded status at year end	$	(1,381	)	$	(1,334	)	$	(347	)	$	(804	)

Schedule of Expected Benefit Payments [Table Text Block]

The expected future benefit payments for the years ending October 31, 2021 through 2025 and the five years ending October 31, 2030 are estimated as follows:

(in millions)	Pension Benefit Payments		Other Postretirement Benefit Payments(A)
2021	$	249	$	31
2022	243		40
2023	236		46
2024	229		46
2025	222		45
2026 through 2030	995		199

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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, 2020										As of October 31, 2019
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	54	$	—	$	—	$	—	$	54	$	68	$	—	$	—	$	—	$	68
Collective Trusts and Other(A)
U.S. Equity	—		286		—		—		286		281		—		—		—		281
International Equity	—		240		—		—		240		283		—		—		—		283
Global Equity	—		211		—		—		211		219		—		—		—		219
Fixed Income - Long Duration Credit	—		320		—		—		320		—		296		—		—		296
Fixed Income - Long Duration Government	—		140		—		—		140		—		173		—		—		173
Fixed Income - Intermediate Duration Government	—		22		—		—		22		—		79		—		—		79
Fixed Income - High Yield	—		89		—		—		89		—		154		—		—		154
Fixed Income - Canadian Bond	—		11		—		—		11		—		20		—		—		20
Global Real Estate	—		157		—		—		157		—		138		—		—		138
Insurance linked Securities	—		—		—		24		24		—		—		—		34		34
Hedge Fund of Funds	—		—		—		181		181		—		—		—		187		187
Private Equity	—		—		—		17		17		—		—		—		23		23
Private Credit	—		—		—		89		89		—		—		—		47		47
Real Estate	—		—		—		19		19		—		—		—		9		9
Total(B)	$	54	$	1,476	$	—	$	330	$	1,860	$	851	$	860	$	—	$	300	$	2,011

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(A) In the fourth quarter of 2020, we utilized a valuation perspective for the Collective Trust whereby we valued those instruments in their entirety. In prior years we used a "look through" approach to individual components of the trust instrument to determine an aggregate fair value. As result of this change, the Collective Trust components are classified as Level 2 in the current period as compared to Level 1 in prior periods.

(B)

In addition, the table above includes the fair value of Canadian pension assets translated at the exchange rates as of October 31, 2020 and 2019, respectively, while the change in the 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, 2020										As of October 31, 2019
(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	$	8	$	—	$	—	$	—	$	8
Fixed Income
U.S. Credit Bonds	—		46		—		—		46		—		58		—		—		58
Collective Trusts and Other(A)
U.S. Equity	—		51		—		—		51		58		—		—		—		58
International Equity	—		51		—		—		51		57		—		—		—		57
Fixed Income - Multi-Asset Credit	—		28		—		—		28		9		19		—		—		28
Real Estate (REITs)	—		—		—		20		20		—		—		—		26		26
Insurance Linked Securities	—		—		—		4		4		—		—		—		6		6
Hedge Fund of Funds	—		—		—		37		37		—		—		—		37		37
Private Equity	—		—		—		4		4		—		—		—		5		5
Total	$	11	$	176	$	—	$	65	$	252	$	132	$	77	$	—	$	74	$	283

Schedule of Net Benefit Costs [Table Text Block]

	For the Years Ended October 31,
	Pension Benefits									Health and Life Insurance Benefits
(in millions)	2020			2019			2018			2020			2019			2018
Service cost for benefits earned during the period	$	8		$	7		$	7		$	3		$	3		$	4
Interest on obligation	84			121			108			28			49			43
Amortization of cumulative loss (gain)	97			94			106			(1		)	(1		)	9
Amortization of prior service cost (benefit)	1			—			—			—			—			—
Settlements	7			143			9			—			—			—
Premiums on pension insurance	11			10			3			—			—			—
Expected return on assets	(145		)	(143		)	(161		)	(19		)	(20		)	(23		)
Net periodic benefit expense	$	63		$	232		$	72		$	11		$	31		$	33
Other Changes in plan assets and benefit obligations recognized in other comprehensive loss (income)
Actuarial net loss (gain)	$	151		$	316		$	(61	)	$	(445	)	$	(138	)	$	(139	)
Prior service cost	—			4			—			—			—			—
Amortization of cumulative (loss) gain	(97		)	(94		)	(106		)	1			1			(9		)
Amortization of prior service benefit (cost)	(1		)	—			—			—			—			—
Settlements	(7		)	(143		)	(9		)	—			—			—
Total recognized in other comprehensive income	$	46		$	83		$	(176	)	$	(444	)	$	(137	)	$	(148	)
Total net postretirement benefits (income) expense and other comprehensive loss (income)	$	109		$	315		$	(104	)	$	(433	)	$	(106	)	$	(115	)

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

	Pension Benefits						Health and Life Insurance Benefits
(in millions)	2020			2019			2020			2019
Amounts recognized in our Consolidated Balance Sheets consist of:
Noncurrent asset	$	5		$	3		$	—		$	—
Current liability	(18		)	(18		)	(10		)	(20		)
Noncurrent liability	(1,368		)	(1,319		)	(337		)	(784		)
Net liability recognized	$	(1,381	)	$	(1,334	)	$	(347	)	$	(804	)
Amounts recognized in our accumulated other comprehensive loss consist of:
Net actuarial loss (gain)	$	2,133		$	2,086		$	(478	)	$	(33	)
Net prior service cost	3			4			—			—
Net amount recognized	$	2,136		$	2,090		$	(478	)	$	(33	)

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	$	1	$	—
Amortization of cumulative losses/(gains)	107		(40		)

Defined Benefit Plan, Assumptions [Table Text Block]

Assumptions

The weighted average rate assumptions used in determining benefit obligations for the years ended October 31, 2020 and 2019 are:

	Pension Benefits				Health and Life Insurance Benefits
	2020		2019		2020		2019
Discount rate used to determine present value of benefit obligation at end of year	2.6	%	3.1	%	2.5	%	3.1	%
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 2020, 2019, and 2018 were:

	Pension Benefits						Health and Life Insurance Benefits
	2020		2019		2018		2020		2019		2018
Discount rate used to determine service cost	3.3	%	4.6	%	3.9	%	3.3	%	4.6	%	3.9	%
Discount rate used to determine interest cost	2.6	%	4.0	%	3.0	%	2.7	%	4.1	%	3.1	%
Expected long-term rate of return on plan assets	7.2	%	7.4	%	7.2	%	7.3	%	7.5	%	7.5	%
Expected rate of increase in future compensation levels	3.5	%	3.5	%	3.5	%	—		—		—