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Postretirement Benefits - Narrative (Details)
employees in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2018
USD ($)
employees
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Liability, Other Postretirement Defined Benefit Plan, Noncurrent $ 66        
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 21   $ 2    
Defined Contribution Plan, Administrative Expense 23   9    
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits   $ 1      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)     105 $ 118 $ 153
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation     3,065 3,487  
Defined Benefit Plan, Accumulated Benefit Obligation     3,300 4,000  
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year     140    
Restructuring Charges     (1) 3 10
Defined Contribution Plan, Cost     33 29  
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation     3,051 3,471  
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Fair Value of Plan Assets     1,865 2,035  
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)     $ 16    
Number Of Former Employees And Their Beneficiaries Included In Retiree Population | employees     30    
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation     7.10%    
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 9        
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 10        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 2        
Income (Loss) from Continuing Operations before Income Taxes, Domestic       28  
Profit sharing accrual     $ 30    
Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)     251 18  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months     283    
Fair Value of Plan Assets     $ 2,162 $ 2,363 $ 2,310
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets     7.20% 7.20% 7.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     4.40% 3.50%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate     3.90% 3.90% 4.50%
Defined Benefit Plan, Assumptions Used in Calculating Interest Cost, Discount Rate     3.00% 2.80% 3.10%
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year     $ 0    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)     72 $ 121 $ 82
Employer contributions     132 112  
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)     286 $ 297  
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year     $ 98    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase     3.50% 3.50%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase     3.50% 3.50% 3.50%
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     $ 2,144 $ 2,346  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two     278    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three     271    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four     264    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five     257    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter     1,173    
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits     0 10  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment     0 0 $ 0
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)     159 183  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months     76    
Fair Value of Plan Assets     297 $ 333 $ 333
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components     $ 8    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets     7.50% 7.50% 7.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     4.40% 3.60%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate     3.90% 4.00% 4.60%
Defined Benefit Plan, Assumptions Used in Calculating Interest Cost, Discount Rate     3.10% 2.90% 3.30%
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year     $ 0    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)     33 $ (3) $ 71
Employer contributions     1 2  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year     1    
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)     160 166  
Defined benefit plan, benefits paid from Company assets     37 $ 48  
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year     $ (1)    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase     0.00% 0.00%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase     0.00% 0.00% 0.00%
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation     92.00%    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate     5.00%    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year     14.40%    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components     $ (7)    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation     169    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation     (143)    
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     297 $ 333  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two     85    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three     91    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four     93    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five     95    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter     454    
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 4   0 4  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment     0 (58) $ 0
Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     861 983  
Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     138 160  
Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     973 1,099  
Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     78 99  
Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Alternative Investments, Fair Value of Plan Assets, NAV     310 263  
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     0 1  
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Alternative Investments, Fair Value of Plan Assets, NAV     81 74  
Defined Benefit Plan, Fair Value of Plan Assets Excluding Receivables     0 0  
Cash and Cash Equivalents [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     77 86  
Cash and Cash Equivalents [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     11 6  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     77 86  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     11 6  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
US Treasury Bond Securities [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     61 0  
US Treasury Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
US Treasury Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     61 0  
US Treasury Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Corporate Bond Securities [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 62  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 62  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
U.S. Equity [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     293 316  
U.S. Equity [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     59 71  
U.S. Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     293 316  
U.S. Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     59 71  
U.S. Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
U.S. Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
U.S. Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
U.S. Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Canadian Equity Other [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     16 19  
Canadian Equity Other [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     16 19  
Canadian Equity Other [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Canadian Equity Other [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
International Equity Other [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     270 327  
International Equity Other [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     59 74  
International Equity Other [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     270 327  
International Equity Other [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     59 74  
International Equity Other [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
International Equity Other [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
International Equity Other [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
International Equity Other [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Fixed Income, Multi Asset Credit [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     26 29  
Fixed Income, Multi Asset Credit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     9 0  
Fixed Income, Multi Asset Credit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     17 29  
Fixed Income, Multi Asset Credit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Global Equity [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     205 235  
Global Equity [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     205 235  
Global Equity [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Global Equity [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Fixed Income, Long Duration Credit [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     283 508  
Fixed Income, Long Duration Credit [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Fixed Income, Long Duration Credit [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     283 508  
Fixed Income, Long Duration Credit [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Government [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     156 20  
Government [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Government [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     156 20  
Government [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Fixed Income, High Yield [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     157 214  
Fixed Income, High Yield [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Fixed Income, High Yield [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     157 214  
Fixed Income, High Yield [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Fixed Income, Canadian Bond [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     194 213  
Fixed Income, Canadian Bond [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Fixed Income, Canadian Bond [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     194 213  
Fixed Income, Canadian Bond [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Global Real Estate [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     135 144  
Global Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Global Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     135 144  
Global Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Global Infrastructure [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     9 10  
Global Infrastructure [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Global Infrastructure [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Global Infrastructure [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     9 10  
Commodities Investment [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     45 0  
Commodities Investment [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 9  
Commodities Investment [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Commodities Investment [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 9  
Commodities Investment [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Commodities Investment [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Commodities Investment [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     45 0  
Commodities Investment [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Insurance Linked Securities [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     8 0  
Insurance Linked Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Insurance Linked Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Insurance Linked Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     8 0  
Hedge Funds [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     202 210  
Hedge Funds [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     39 39  
Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     202 210  
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     39 39  
Private Equity Funds [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     32 43  
Private Equity Funds [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     8 11  
Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     32 43  
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     8 11  
Real Estate [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 1  
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 1  
Alternative Investments, Fair Value of Plan Assets, NAV     0 0  
Common Stock | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     26 24  
Common Stock | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Common Stock | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Common Stock | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Fair Value of Plan Assets     0 0  
Alternative Investments, Fair Value of Plan Assets, NAV     $ 26 $ 24  
Return-seeking Assets [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Target Allocation Percentage     70.00%    
Liability-hedging Assets [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Target Allocation Percentage     30.00%    
Melrose Park [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment $ 91