(Tables)

12 Months Ended

Oct. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Obligations and Funded Status

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

	Pension Benefits						Health and Life Insurance Benefits
(in millions)	2015			2014			2015			2014
Change in benefit obligations
Benefit obligations at beginning of year	$	4,041		$	3,943		$	1,957		$	1,674
Service cost	13			12			6			5
Interest on obligations	142			158			71			68
Actuarial loss (gain)	146			176			(34		)	319
Curtailments	—			(2		)	—			—
Contractual termination benefits	(1		)	23			(1		)	2
Currency translation	(53		)	49			—			—
Plan participants' contributions	—			—			31			40
Subsidy receipts	—			—			40			34
Benefits paid	(309		)	(318		)	(183		)	(185		)
Benefit obligations at end of year	$	3,979		$	4,041		$	1,887		$	1,957
Change in plan assets
Fair value of plan assets at beginning of year	$	2,627		$	2,519		$	415		$	447
Actual return on plan assets	27			206			3			26
Currency translation	(51		)	42			—			—
Employer contributions	113			164			2			2
Benefits paid	(294		)	(304		)	(51		)	(60		)
Fair value of plan assets at end of year	$	2,422		$	2,627		$	369		$	415
Funded status at year end	$	(1,557	)	$	(1,414	)	$	(1,518	)	$	(1,542	)

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)	2015			2014			2015			2014
Amounts recognized in our Consolidated Balance Sheets consist of:
Noncurrent asset	$	13		$	—		$	—		$	—
Current liability	(15		)	(15		)	(78		)	(79		)
Noncurrent liability	(1,555		)	(1,399		)	(1,440		)	(1,463		)
Net liability recognized	$	(1,557	)	$	(1,414	)	$	(1,518	)	$	(1,542	)
Amounts recognized in our accumulated other comprehensive loss consist of:
Net actuarial loss	$	2,234		$	2,019		$	618		$	664
Net prior service cost (benefit)	—			1			(1		)	(6		)
Net amount recognized	$	2,234		$	2,020		$	617		$	658

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	103		33

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:

(in millions)	2015		2014
Projected benefit obligations	$	3,631	$	4,041
Accumulated benefit obligations	3,612		4,021
Fair value of plan assets	2,061		2,627

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 for the years ended October 31 consist of the following:

(in millions)	2015		2014		2013
Pension expense	$	69	$	106	$	116
Health and life insurance expense	81		54		61
Total postretirement benefits expense	$	150	$	160	$	177

Schedule of Net Benefit Costs [Table Text Block]

Net postretirement benefits expense included in our Consolidated Statements of Operations, and other amounts recognized in our Consolidated Statements of Stockholders' Deficit, for the years ended October 31 is comprised of the following:

	Pension Benefits									Health and Life Insurance Benefits
(in millions)	2015			2014			2013			2015			2014			2013
Service cost for benefits earned during the period	$	13		$	12		$	20		$	6		$	5		$	7
Interest on obligation	142			158			143			71			68			62
Amortization of cumulative loss	97			94			128			39			16			29
Amortization of prior service cost (benefit)	1			—			1			(4		)	(4		)	(4		)
Curtailments	—			—			4			—			—			—
Contractual termination benefits	(1		)	23			—			(1		)	2			—
Premiums on pension insurance	11			12			9			—			—			—
Expected return on assets	(194		)	(193		)	(189		)	(30		)	(33		)	(33		)
Net postretirement benefits expense	$	69		$	106		$	116		$	81		$	54		$	61
Other Changes in plan assets and benefit obligations recognized in other comprehensive loss (income)
Actuarial net loss (gain)	$	312		$	164		$	(422	)	$	(7	)	$	326		$	(175	)
Amortization of cumulative loss	(97		)	(94		)	(128		)	(39		)	(16		)	(29		)
Prior service benefit	—			—			(1		)	—			—			—
Amortization of prior service benefit (cost)	(1		)	—			(1		)	4			4			4
Curtailments	—			—			(33		)	—			—			—
Currency translation	—			1			—			—			—			—
Total recognized in other comprehensive loss (income)	$	214		$	71		$	(585	)	$	(42	)	$	314		$	(200	)
Total net postretirement benefits expense and other comprehensive loss (income)	$	283		$	177		$	(469	)	$	39		$	368		$	(139	)

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	264		(219		)

Schedule of Allocation of Plan Assets [Table Text Block]

	2015								2014
(in millions)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Asset Category
Cash and Cash Equivalents	$	29	$	—	$	—	$	29	$	16	$	—	$	—	$	16
Equity
U.S. Large Cap	25		—		—		25		28		—		—		28
U.S. Small-Mid Cap	42		—		—		42		60		—		—		60
International	53		—		—		53		60		—		—		60
Emerging Markets	14		—		—		14		19		—		—		19
Fixed Income
Corporate Bonds	—		58		—		58		—		55		—		55
Government Bonds	—		42		—		42		—		49		—		49
Asset Backed Securities	—		3		—		3		—		3		—		3
Collective Trusts and Other
Common Stock	—		59		—		59		—		69		—		69
Commodities	—		1		—		1		—		10		—		10
Hedge Funds	—		—		22		22		—		—		22		22
Private Equity	—		—		20		20		—		—		23		23
Total(A)	$	163	$	163	$	42	$	368	$	183	$	186	$	45	$	414

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(A) For both October 31, 2015 and 2014, the totals exclude $1 million of receivables, which are included in the change in plan asset table.

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

Pension Assets

	2015								2014
(in millions)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3			Total
Asset Category
Cash and Cash Equivalents	$	126	$	—	$	—	$	126	$	112	$	—	$	—		$	112
Equity
U.S. Large Cap	209		—		—		209		227		—		—			227
U.S. Small-Mid Cap	253		—		—		253		313		—		—			313
Canadian	30		—		—		30		44		—		—			44
International	216		—		—		216		244		—		—			244
Emerging Markets	77		—		—		77		108		—		—			108
Equity derivative	—		—		—		—		—		—		(106		)	(106		)
Fixed Income
Corporate Bonds	—		193		—		193		—		200		—			200
Government Bonds	—		599		—		599		—		630		—			630
Asset Backed Securities	—		7		—		7		—		8		—			8
Fixed income derivative	—		—		—		—		—		—		1			1
Collective Trusts and Other
Common and Preferred Stock	—		449		—		449		—		531		—			531
Commodities	—		21		—		21		—		58		—			58
Hedge Funds	—		—		109		109		—		—		106			106
Private Equity	—		—		79		79		—		—		94			94
Exchange Traded Funds	6		—		—		6		9		—		—			9
Mutual Funds	29		—		—		29		29		—		—			29
Real Estate	—		—		1		1		—		—		1			1
Total(A)	$	946	$	1,269	$	189	$	2,404	$	1,086	$	1,427	$	96		$	2,609

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(A) For October 31, 2015 and 2014, the totals exclude $8 million and $9 million of receivables, respectively, which are included in the change in plan assets table. In addition, the table above includes the fair value of Canadian pension assets translated at the exchange rates as of October 31, 2015 and 2014, respectively, while the change in plan asset table includes the fair value of Canadian pension assets translated at historical foreign currency rates.

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

The table below presents the changes for those financial instruments classified within Level 3 of the valuation hierarchy for other postretirement benefit assets for the years ended October 31, 2015 and 2014:

(in millions)	Hedge Funds		Private Equity
Balance at November 1, 2013	$	21	$	26
Unrealized gains	1		3
Realized gains	—		4
Purchases, issuances, and settlements	—		(10		)
Balance at October 31, 2014	$	22	$	23
Realized gains	—		1
Purchases, issuances, and settlements	—		(4		)
Balance at October 31, 2015	$	22	$	20

The table below presents the changes for those financial instruments classified within Level 3 of the valuation hierarchy for pension assets for the years ended October 31, 2015 and 2014:

(in millions)	Hedge Funds		Private Equity			Real Estate		Fixed Income Derivative			Equity Derivatives
Balance at November 1, 2013	$	101	$	103		$	1	$	(13	)	$	(72	)
Unrealized gains (losses)	5		10			—		14			(43		)
Realized gains	—		15			—		—			—
Purchases, issuances, and settlements	—		(34		)	—		—			9
Balance at October 31, 2014	$	106	$	94		$	1	$	1		$	(106	)
Unrealized gains (losses)	2		—			—		(1		)	138
Realized gains	1		5			—		8			(165		)
Purchases, issuances, and settlements	—		(20		)	—		(8		)	133
Balance at October 31, 2015	$	109	$	79		$	1	$	—		$	—

Schedule of Expected Benefit Payments [Table Text Block]

The expected future benefit payments for the years ending October 31, 2016 through 2020 and the five years ending October 31, 2025 are estimated as follows:

(in millions)	Pension Benefit Payments		Other Postretirement Benefit Payments(A)
2016	$	304	$	129
2017	298		121
2018	292		123
2019	285		122
2020	280		121
2021 through 2025	1,288		586

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

Schedule of Assumptions Used [Table Text Block]

Assumptions

The weighted average rate assumptions used in determining benefit obligations for the years ended October 31, 2015 and 2014 were:

	Pension Benefits				Health and Life Insurance Benefits
	2015		2014		2015		2014
Discount rate used to determine present value of benefit obligation at end of year	4.0	%	3.7	%	4.1	%	3.7	%
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 2015, 2014, and 2013 were:

	Pension Benefits						Health and Life Insurance Benefits
	2015		2014		2013		2015		2014		2013
Discount rate	3.7	%	4.1	%	3.2	%	3.7	%	4.1	%	3.4	%
Expected long-term rate of return on plan assets	7.8	%	7.8	%	8.0	%	7.8	%	7.8	%	8.0	%
Expected rate of increase in future compensation levels	3.5	%	3.5	%	3.5	%	—		—		—