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Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | $ 433 | $ 384
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 109 | 90
Accumulated benefit obligation | 97 | 80
Fair value of plan assets | 33 | 25
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 238 | 212
Fair value of plan assets | 154 | 142
UNITED STATES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated Benefit Obligation | 1,236 | 1,167
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 1,257 | 1,188
Accumulated benefit obligation | 1,236 | 1,167
Fair value of plan assets | 1,127 | 1,044
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | 1,257 | 1,188
Fair value of plan assets | $ 1,127 | $ 1,044

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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