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Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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U.S. Defined Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation |  | $ 1,150 | $ 1,208
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation |  | 1,172 | 1,235
Accumulated benefit obligation |  | 1,150 | 1,208
Fair value of plan assets |  | 1,021 | 1,061
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation |  | 1,172 | 1,235
Fair value of plan assets |  | 1,021 | 1,061
Foreign Defined Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated Benefit Obligation |  | 2,931 | 4,301
Information for pension plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation |  | 2,683 | 4,021
Accumulated benefit obligation |  | 2,656 | 3,979
Fair value of plan assets |  | 1,931 | 2,885
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | [1] | 2,697 | 4,038
Fair value of plan assets | [1] | 1,942 | 2,897
Electropaulo | Foreign Defined Benefit Plans |  |  |
Information for pension plans with a projected benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation |  | $ 700 | $ 1,100
[1] | (1)$686 million and $1.1 billion of the total net unfunded projected benefit obligation is due to Eletropaulo in Brazil as of December 31, 2015 and 2014, respectively.

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: 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=58740216&loc=d3e2417-114920 + Details
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