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Retirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 256 | $ 261 | $ 272
Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12 | 15 |
Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23 | 18 |
Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 142 | 141 |
Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12 | 15 |
Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 91 | 102 |
Level 1 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 165 | 159 |
Level 1 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12 | 0 |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 23 | 18 |
Level 1 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 142 | 141 |
Level 1 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 12 | 0 |
Level 1 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 91 | 102 |
Level 2 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 15 |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 15 |
Level 2 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 91 | 102 |
Level 3 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | $ 0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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