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Retirement and Post-Retirement Benefit Plan - Schedule of Fair Value of Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
U.S. Defined Benefit Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 10,176 $ 11,077 $ 11,979
U.S. Defined Benefit Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,775 2,160  
U.S. Defined Benefit Plans | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 3,132 3,229  
U.S. Defined Benefit Plans | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,782 1,712  
U.S. Defined Benefit Plans | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,027 1,291  
U.S. Defined Benefit Plans | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,834 1,837  
U.S. Defined Benefit Plans | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 639 756  
U.S. Defined Benefit Plans | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 123 214  
U.S. Defined Benefit Plans | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 56 76  
U.S. Defined Benefit Plans | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets (192) (198)  
U.S. Defined Benefit Plans | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,571 1,990  
U.S. Defined Benefit Plans | Level 1 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,716 2,100  
U.S. Defined Benefit Plans | Level 1 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 1 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 20 38  
U.S. Defined Benefit Plans | Level 1 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 4 5  
U.S. Defined Benefit Plans | Level 1 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets (169) (153)  
U.S. Defined Benefit Plans | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 7,578 7,765  
U.S. Defined Benefit Plans | Level 2 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 59 60  
U.S. Defined Benefit Plans | Level 2 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 3,132 3,198  
U.S. Defined Benefit Plans | Level 2 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,782 1,712  
U.S. Defined Benefit Plans | Level 2 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 2 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,834 1,837  
U.S. Defined Benefit Plans | Level 2 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 2 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 2 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 639 756  
U.S. Defined Benefit Plans | Level 2 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 103 176  
U.S. Defined Benefit Plans | Level 2 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 52 71  
U.S. Defined Benefit Plans | Level 2 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets (23) (45)  
U.S. Defined Benefit Plans | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,027 1,322 1,416
U.S. Defined Benefit Plans | Level 3 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 31 7
U.S. Defined Benefit Plans | Level 3 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,027 1,291 1,409
U.S. Defined Benefit Plans | Level 3 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
U.S. Defined Benefit Plans | Level 3 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 692 853 12,472
Non-U.S. Defined Benefit Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 133 232  
Non-U.S. Defined Benefit Plans | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 124 260  
Non-U.S. Defined Benefit Plans | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 26 59  
Non-U.S. Defined Benefit Plans | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 13 18  
Non-U.S. Defined Benefit Plans | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 277 182  
Non-U.S. Defined Benefit Plans | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 25 27  
Non-U.S. Defined Benefit Plans | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 3 8  
Non-U.S. Defined Benefit Plans | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 11 4  
Non-U.S. Defined Benefit Plans | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 30 30  
Non-U.S. Defined Benefit Plans | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 18 18  
Non-U.S. Defined Benefit Plans | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 32 15  
Non-U.S. Defined Benefit Plans | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 178 177  
Non-U.S. Defined Benefit Plans | Level 1 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 122 120  
Non-U.S. Defined Benefit Plans | Level 1 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 1 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 1 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 1 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 1 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1 2  
Non-U.S. Defined Benefit Plans | Level 1 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 1 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 1 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 30 30  
Non-U.S. Defined Benefit Plans | Level 1 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 18 18  
Non-U.S. Defined Benefit Plans | Level 1 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 7 7  
Non-U.S. Defined Benefit Plans | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 486 635  
Non-U.S. Defined Benefit Plans | Level 2 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 4 97  
Non-U.S. Defined Benefit Plans | Level 2 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 124 260  
Non-U.S. Defined Benefit Plans | Level 2 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 26 59  
Non-U.S. Defined Benefit Plans | Level 2 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2 2  
Non-U.S. Defined Benefit Plans | Level 2 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 277 182  
Non-U.S. Defined Benefit Plans | Level 2 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 24 25  
Non-U.S. Defined Benefit Plans | Level 2 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2 5  
Non-U.S. Defined Benefit Plans | Level 2 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 11 4  
Non-U.S. Defined Benefit Plans | Level 2 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 2 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 2 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 16 1  
Non-U.S. Defined Benefit Plans | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 28 41 275
Non-U.S. Defined Benefit Plans | Level 3 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 7 15  
Non-U.S. Defined Benefit Plans | Level 3 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 11 16 160
Non-U.S. Defined Benefit Plans | Level 3 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1 3 35
Non-U.S. Defined Benefit Plans | Level 3 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Non-U.S. Defined Benefit Plans | Level 3 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 9 7 0
Post-Retirement Benefit Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 390 434 458
Post-Retirement Benefit Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1 1  
Post-Retirement Benefit Plans | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 26 28  
Post-Retirement Benefit Plans | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 42 39  
Post-Retirement Benefit Plans | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 219 253  
Post-Retirement Benefit Plans | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 51 59  
Post-Retirement Benefit Plans | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 58 55  
Post-Retirement Benefit Plans | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 5 7  
Post-Retirement Benefit Plans | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets (12) (8)  
Post-Retirement Benefit Plans | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 42 48  
Post-Retirement Benefit Plans | Level 1 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 1 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 54 52  
Post-Retirement Benefit Plans | Level 1 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 4  
Post-Retirement Benefit Plans | Level 1 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets (12) (8)  
Post-Retirement Benefit Plans | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 129 133  
Post-Retirement Benefit Plans | Level 2 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1 1  
Post-Retirement Benefit Plans | Level 2 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 26 28  
Post-Retirement Benefit Plans | Level 2 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 42 39  
Post-Retirement Benefit Plans | Level 2 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 2 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 2 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 2 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 2 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 51 59  
Post-Retirement Benefit Plans | Level 2 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 4 3  
Post-Retirement Benefit Plans | Level 2 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 5 3  
Post-Retirement Benefit Plans | Level 2 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 219 253  
Post-Retirement Benefit Plans | Level 3 | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Government      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Alternative Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 219 253 $ 272
Post-Retirement Benefit Plans | Level 3 | Common Contractual Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Real Estate Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Insurance Group Annuity Contracts      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Common Collective Trusts and 103-12 Investment Entities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Registered Investment Companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Cash and Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Post-Retirement Benefit Plans | Level 3 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 0 $ 0