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Benefit Plans Benefit Plans (Weighted Average Assumptions) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
U.S. Defined Benefit Plans |  |  |
Benefit Obligation: |  |  |
Discount rates |  | 4.44% | 4.04%
Rates of compensation increase | [1] | 3.34% | 3.94%
Periodic Benefit Cost: |  |  |
Discount rate |  | 4.04% | 4.89%
Expected long-term rate of return on plan assets |  | 6.67% | 6.92%
Rate of compensation increase | [1] | 3.94% | 3.94%
Defined benefit plan, benefit obligation subsidiary using salary bonds |  | $ 6 | $ 748
Defined Benefit Plan Obligation subsidiary using compensation increase |  |  | $ 742
Foreign Defined Benefit Plans |  |  |
Benefit Obligation: |  |  |
Discount rates | [2] | 11.37% | 10.47%
Rates of compensation increase |  | 6.32% | 6.41%
Periodic Benefit Cost: |  |  |
Discount rate |  | 10.47% | 10.80%
Expected long-term rate of return on plan assets |  | 9.77% | 10.44%
Rate of compensation increase |  | 6.41% | 6.44%
[1] | (1)A U.S. subsidiary of the Company has defined benefit obligations of $6 million and $748 million as of December 31, 2015 and 2014, respectively, for which salary bands, rather than rates of compensation increases, are used to determine future benefit costs. Rates of compensation increases in the table above do not include amounts related to these specific defined benefit plans. A plan with a defined benefit obligation of $742 million at December 31, 2014 and which used salary bands at that date is using a rate of compensation increase as at December 31, 2015. The rate of compensation increase for this plan is included in the weighted average in the above table for calculating the benefit obligation as at December 31, 2015, but is not included in the weighted average for calculating the benefit obligation as at December 31, 2014 or the periodic benefit cost for 2014 or 2015.
[2] | (2) Includes an inflation factor that is used to calculate future periodic benefit cost, but is not used to calculate the benefit obligation.

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- Definition Represents the benefit obligation (the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date) of a subsidiary which uses salary bands to determine future benefit costs rather than a rate of compensation increase + References No definition available. + Details
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- Definition Defined Benefit Plan Obligation subsidiary using compensation increase + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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