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Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Increase to liabilities | $ (18) | $ 25
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase to liabilities | 250 |
Employer contributions | 3 |
Pension Plan [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional employer contributions | 30 |
Pension Plan [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional employer contributions | 75 |
Other Postretirement Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase to liabilities | $ 70 |

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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