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Long-Term Employee Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 01, 2013
Other Long-Term Employee Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pre-tax net loss that will be amortized from accumulated other comprehensive income in next fiscal year | $ 69 |  |  |
Pre-tax prior service cost/(credit) that will be amortized from accumulated other comprehensive income in next fiscal year | $ (156) |  |  |
Discount rate | 4.13% | 4.60% | 3.85% |
Expected return on plan assets | 0.00% | 0.00% | 0.00% |
Rate of compensation increase | 0.00% | 0.00% | 4.40% |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Charge related to prior period settlements | $ 32 |  |  |
Charge related to prior period settlements, after-tax | 21 |  |  |
Accumulated other comprehensive loss revision for pension settlement charges |  |  |  | $ 54
Accumulated benefit obligation | 24,984 | $ 27,923 |  |
Pre-tax net loss that will be amortized from accumulated other comprehensive income in next fiscal year | 689 |  |  |
Pre-tax prior service cost/(credit) that will be amortized from accumulated other comprehensive income in next fiscal year | $ (6) |  |  |
Discount rate | 3.93% | 4.55% | 3.90% |
Expected return on plan assets | 8.10% | 8.35% | 8.39% |
Rate of compensation increase | 4.01% | 4.22% | 4.14% |
United States Pension Plan of US Entity [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate | 4.29% | 4.90% | 4.10% |
Expected return on plan assets | 8.50% | 8.75% | 8.75% |
Rate of compensation increase | 4.20% | 4.50% | 4.40% |

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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 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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