(Tables)

12 Months Ended

Oct. 31, 2016

Compensation and Retirement Disclosure [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	$	12	$	(10	)
Effect on postretirement benefit obligation	205		(159		)

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)	2016		2015		2014
Pension expense	$	82	$	69	$	106
Health and life insurance expense	71		81		54
Total postretirement benefits expense	$	153	$	150	$	160

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)	2016		2015
Projected benefit obligations	$	3,946	$	3,631
Accumulated benefit obligations	3,934		3,612
Fair value of plan assets	2,224		2,061

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)	2016			2015			2016			2015
Change in benefit obligations
Benefit obligations at beginning of year	$	3,979		$	4,041		$	1,887		$	1,957
Service cost	9			13			5			6
Interest on obligations	118			142			58			71
Actuarial loss (gain)	225			146			(138		)	(34		)
Contractual termination benefits	3			(1		)	4			(1		)
Currency translation	(7		)	(53		)	—			—
Plan participants' contributions	—			—			34			31
Subsidy receipts	—			—			37			40
Benefits paid	(300		)	(309		)	(179		)	(183		)
Benefit obligations at end of year	$	4,027		$	3,979		$	1,708		$	1,887
Change in plan assets
Fair value of plan assets at beginning of year	$	2,422		$	2,627		$	369		$	415
Actual return on plan assets	79			27			3			3
Currency translation	(6		)	(51		)	—			—
Employer contributions	100			113			2			2
Benefits paid	(285		)	(294		)	(41		)	(51		)
Fair value of plan assets at end of year	$	2,310		$	2,422		$	333		$	369
Funded status at year end	$	(1,717	)	$	(1,557	)	$	(1,375	)	$	(1,518	)

Schedule of Expected Benefit Payments [Table Text Block]

The expected future benefit payments for the years ending October 31, 2017 through 2021 and the five years ending October 31, 2026 are estimated as follows:

(in millions)	Pension Benefit Payments		Other Postretirement Benefit Payments(A)
2017	$	306	$	100
2018	293		105
2019	287		111
2020	281		111
2021	273		112
2022 through 2026	1,252		532

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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, 2016										As of October 31, 2015
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	76	$	—	$	—	$	—	$	76	$	126	$	—	$	—	$	—	$	126
Equity
U.S. Large Cap	—		—		—		—		—		209		—		—		—		209
U.S. Small-Mid Cap	—		—		—		—		—		253		—		—		—		253
Canadian	—		—		—		—		—		30		—		—		—		30
International	—		—		—		—		—		216		—		—		—		216
Emerging Markets	—		—		—		—		—		77		—		—		—		77
Equity derivative	—		—		—		—		—		—		—		—		—		—
Fixed Income
Corporate and Government Bonds	—		—		—		—		—		—		792		—		—		792
Asset Backed Securities	—		—		—		—		—		—		7		—		—		7
Collective Trusts and Other
U.S. Equity	294		—		—		—		294		—		—		—		—		—
Canadian Equity	29		—		—		—		29		—		—		—		—		—
International Equity	291		—		—		—		291		—		—		—		—		—
Global Equity	227		—		—		—		227		—		—		—		—		—
Fixed Income - Long Duration Credit	—		530		—		—		530		—		—		—		—		—
Fixed Income - High Yield	—		204		—		—		204		—		—		—		—		—
Fixed Income - Canadian Bond	—		203		—		—		203		—		—		—		—		—
Global Real Estate	—		141		—		—		141		—		—		—		—		—
Global Infrastructure	—		—		—		14		14		—		—		—		—		—
Common and Preferred Stock	—		—		—		—		—		—		449		—		—		449
Commodities	—		—		—		—		—		—		21		—		—		21
Hedge Fund of Funds	—		—		—		230		230		—		—		—		109		109
Private Equity	—		—		—		57		57		—		—		—		79		79
Exchange Traded Funds	—		—		—		—		—		6		—		—		—		6
Mutual Funds	—		—		—		—		—		29		—		—		—		29
Real Estate	—		—		1		—		1		—		—		1		—		1
Total(A)	$	917	$	1,078	$	1	$	301	$	2,297	$	946	$	1,269	$	1	$	188	$	2,404

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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, 2016 and 2015, 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, 2016										As of October 31, 2015
(in millions)	Level 1		Level 2		Level 3		NAV		Total		Level 1		Level 2		Level 3		NAV		Total
Asset Category
Cash and Cash Equivalents	$	19	$	—	$	—	$	—	$	19	$	29	$	—	$	—	$	—	$	29
Equity
U.S. Large Cap	—		—		—		—		—		25		—		—		—		25
U.S. Small-Mid Cap	—		—		—		—		—		42		—		—		—		42
International	—		—		—		—		—		53		—		—		—		53
Emerging Markets	—		—		—		—		—		14		—		—		—		14
Fixed Income
Corporate and Government Bonds	—		80		—		—		80		—		100		—		—		100
Asset Backed Securities	—		—		—		—		—		—		3		—		—		3
Collective Trusts and Other
U.S. Equity	66		—		—		—		66		—		—		—		—		—
International Equity	71		—		—		—		71		—		—		—		—		—
Fixed Income - Multi-Asset Credit	—		41		—		—		41		—		—		—		—		—
Common Stock	—		—		—		—		—		—		59		—		—		59
Commodities	—		—		—		—		—		—		1		—		—		1
Hedge Fund of Funds	—		—		—		42		42		—		—		—		22		22
Private Equity	—		—		—		14		14		—		—		—		20		20
Total	$	156	$	121	$	—	$	56	$	333	$	163	$	163	$	—	$	42	$	368

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits									Health and Life Insurance Benefits
(in millions)	2016			2015			2014			2016			2015			2014
Service cost for benefits earned during the period	$	9		$	13		$	12		$	5		$	6		$	5
Interest on obligation	118			142			158			58			71			68
Amortization of cumulative loss	104			97			94			31			39			16
Amortization of prior service cost (benefit)	—			1			—			(1		)	(4		)	(4		)
Contractual termination benefits	3			(1		)	23			4			(1		)	2
Premiums on pension insurance	15			11			12			—			—			—
Expected return on assets	(167		)	(194		)	(193		)	(26		)	(30		)	(33		)
Net periodic benefit expense	$	82		$	69		$	106		$	71		$	81		$	54
Other Changes in plan assets and benefit obligations recognized in other comprehensive loss (income)
Actuarial net loss (gain)	$	313		$	312		$	164		$	(115	)	$	(7	)	$	326
Amortization of cumulative loss	(104		)	(97		)	(94		)	(31		)	(39		)	(16		)
Amortization of prior service benefit (cost)	—			(1		)	—			1			4			4
Currency translation	(1		)	—			1			—			—			—
Total recognized in other comprehensive loss (income)	$	208		$	214		$	71		$	(145	)	$	(42	)	$	314
Total net postretirement benefits expense and other comprehensive loss (income)	$	290		$	283		$	177		$	(74	)	$	39		$	368

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)	2016			2015			2016			2015
Amounts recognized in our Consolidated Balance Sheets consist of:
Noncurrent asset	$	6		$	13		$	—		$	—
Current liability	(17		)	(15		)	(58		)	(78		)
Noncurrent liability	(1,706		)	(1,555		)	(1,317		)	(1,440		)
Net liability recognized	$	(1,717	)	$	(1,557	)	$	(1,375	)	$	(1,518	)
Amounts recognized in our accumulated other comprehensive loss consist of:
Net actuarial loss	$	2,442		$	2,234		$	472		$	618
Net prior service benefit	—			—			—			(1		)
Net amount recognized	$	2,442		$	2,234		$	472		$	617

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	117		23

Schedule of Assumptions Used [Table Text Block]

Assumptions

The weighted average rate assumptions used in determining benefit obligations for the years ended October 31, 2016 and 2015 were:

	Pension Benefits				Health and Life Insurance Benefits
	2016		2015		2016		2015
Discount rate used to determine present value of benefit obligation at end of year	3.5	%	4.0	%	3.5	%	4.1	%
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 2016, 2015, and 2014 were:

	Pension Benefits						Health and Life Insurance Benefits
	2016		2015		2014		2016		2015		2014
Discount rate used to determine service cost	4.5	%	3.7	%	4.1	%	4.6	%	3.7	%	4.1	%
Discount rate used to determine interest cost	3.1	%	3.7	%	4.1	%	3.3	%	3.7	%	4.1	%
Expected long-term rate of return on plan assets	7.5	%	7.8	%	7.8	%	7.5	%	7.8	%	7.8	%
Expected rate of increase in future compensation levels	3.5	%	3.5	%	3.5	%	—		—		—