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Pension and Other Postretirement Benefit Plans (Fair Value of Plan Assets by Category) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 3,041 | $ 2,987
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 335 | 565
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 2,508 | 2,226
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 198 | 196
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 23 | 15
Cash and Cash Equivalents | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 23 | 15
Cash and Cash Equivalents | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Cash and Cash Equivalents | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
US Government Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 432 | 433
US Government Debt Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
US Government Debt Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 432 | 433
US Government Debt Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Foreign Government Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 131 | 104
Foreign Government Debt Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Foreign Government Debt Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 131 | 104
Foreign Government Debt Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Domestic Corporate Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 850 | 751
Domestic Corporate Debt Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Domestic Corporate Debt Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 850 | 751
Domestic Corporate Debt Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Foreign Corporate Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 193 | 176
Foreign Corporate Debt Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Foreign Corporate Debt Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 193 | 176
Foreign Corporate Debt Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
U.S. Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 12 | 217
U.S. Equity Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 12 | 217
U.S. Equity Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
U.S. Equity Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Foreign Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 223 | 233
Foreign Equity Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 223 | 233
Foreign Equity Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Foreign Equity Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 77 | 100
Money Market Funds | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 77 | 100
Money Market Funds | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Money Market Funds | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Common and Collective Funds, U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 718 | 589
Common and Collective Funds, U.S. equity securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Common and Collective Funds, U.S. equity securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 718 | 589
Common and Collective Funds, U.S. equity securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Common and Collective Funds, International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 79 | 106
Common and Collective Funds, International equity securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Common and Collective Funds, International equity securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 79 | 106
Common and Collective Funds, International equity securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Common and Collective Funds, Short-term investment fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 87 | 49
Common and Collective Funds, Short-term investment fund | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Common and Collective Funds, Short-term investment fund | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 87 | 49
Common and Collective Funds, Short-term investment fund | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnership, U.S. Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 145 | 143
Limited Partnership, U.S. Equity Securities | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnership, U.S. Equity Securities | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnership, U.S. Equity Securities | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 145 | 143
Limited Partnerships, Diversified fund of funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 35 | 38
Limited Partnerships, Diversified fund of funds | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnerships, Diversified fund of funds | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnerships, Diversified fund of funds | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 35 | 38
Limited Partnerships, Emerging growth |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 18 | 15
Limited Partnerships, Emerging growth | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnerships, Emerging growth | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Limited Partnerships, Emerging growth | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 18 | 15
Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 11 | 10
Real Estate | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Real Estate | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 11 | 10
Real Estate | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 7 | 8
Other Investments | Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 0 | 0
Other Investments | Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 7 | 8
Other Investments | Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 0 | $ 0

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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