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Employee Benefits Schedule of Fair Value, Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Pension Plan assets: |  |
Money market funds |  | $ 1
Equity securities: |  |
Domestic | 185 | 165
International equity securities - defined benefit pension plan assets | 185 | 166
Debt securities: |  |
Domestic government and corporate credit | 181 | 165
Corporate credit | 14 | 8
Private equity funds | 31 | 32
Defined Benefit Plan, Fair Value of Plan Assets | 596 | 537
Other Postretirement Benefit Plans assets: [Abstract] |  |
Money market funds | 10 | 8
Domestic equity securities - Other postretirement benefit plan assets at fair value | 10 | 9
International equity securities - other post retirement assets at fair value | 9 | 8
Debt securities—Domestic government | 3 | 3
Other post retirement benefit plan assets total | 32 | 28
Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Pension Plan assets: |  |
Money market funds |  | 0
Equity securities: |  |
Domestic | 166 | 150
International equity securities - defined benefit pension plan assets | 185 | 166
Debt securities: |  |
Domestic government and corporate credit | 0 | 0
Corporate credit | 14 | 8
Private equity funds | 0 | 0
Defined Benefit Plan, Fair Value of Plan Assets | 365 | 324
Other Postretirement Benefit Plans assets: [Abstract] |  |
Money market funds | 0 | 0
Domestic equity securities - Other postretirement benefit plan assets at fair value | 8 | 8
International equity securities - other post retirement assets at fair value | 9 | 8
Debt securities—Domestic government | 3 | 3
Other post retirement benefit plan assets total | 20 | 19
Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Pension Plan assets: |  |
Money market funds |  | 1
Equity securities: |  |
Domestic | 19 | 15
International equity securities - defined benefit pension plan assets | 0 | 0
Debt securities: |  |
Domestic government and corporate credit | 181 | 165
Corporate credit | 0 | 0
Private equity funds | 0 | 0
Defined Benefit Plan, Fair Value of Plan Assets | 200 | 181
Other Postretirement Benefit Plans assets: [Abstract] |  |
Money market funds | 10 | 8
Domestic equity securities - Other postretirement benefit plan assets at fair value | 2 | 1
International equity securities - other post retirement assets at fair value | 0 | 0
Debt securities—Domestic government | 0 | 0
Other post retirement benefit plan assets total | 12 | 9
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Pension Plan assets: |  |
Money market funds |  | 0
Equity securities: |  |
Domestic | 0 | 0
International equity securities - defined benefit pension plan assets | 0 | 0
Debt securities: |  |
Domestic government and corporate credit | 0 | 0
Corporate credit | 0 | 0
Private equity funds | 31 | 32
Defined Benefit Plan, Fair Value of Plan Assets | 31 | 32
Other Postretirement Benefit Plans assets: [Abstract] |  |
Money market funds | 0 | 0
Domestic equity securities - Other postretirement benefit plan assets at fair value | 0 | 0
International equity securities - other post retirement assets at fair value | 0 | 0
Debt securities—Domestic government | 0 | 0
Other post retirement benefit plan assets total | $ 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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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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