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Employee Benefits (Details 2) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 02, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net periodic cost |  |  |  |
Weighted-average healthcare cost rate |  | 5.00% |  |
Effects created by one percentage point change in assumed healthcare cost trend |  |  |  |
Effect of 1% point increase on postretirement obligation |  | $ 5 |  |
Effect of 1% point decrease on postretirement obligation |  | $ (4) |  |
Retirement Plans [Member] |  |  |  |
Benefit obligation |  |  |  |
Discount rate |  | 4.15% | 5.00% | 4.10%
Net periodic cost |  |  |  |
Discount rate |  | 5.00% | 4.10% | 5.10%
Compensation increase factor |  |  |  | 4.50%
Return on assets |  | 7.125% | 7.25% | 7.75%
Postretirement Plans [Member] |  |  |  |
Benefit obligation |  |  |  |
Discount rate |  | 3.60% | 4.20% | 3.45%
Net periodic cost |  |  |  |
Weighted-average healthcare cost rate |  | 7.00% | 7.00% | 7.50%
Discount rate |  | 4.125% | 3.45% | 4.45%
United Kingdom Retirement Plan [Member] |  |  |  |
Net periodic cost |  |  |  |
Discount rate |  | 4.50% | 4.80% | 5.10%
Compensation increase factor |  |  | 5.75% | 5.85%
Return on assets |  | 6.75% |  |
United States Pension Plan of US Entity [Member] |  |  |  |
Net periodic cost |  |  |  |
Discount rate |  | 5.00% |  |
Subsequent Event [Member] | Retirement Plans [Member] |  |  |  |
Net periodic cost |  |  |  |
Return on assets | 6.25% |  |  |
Subsequent Event [Member] | United Kingdom Retirement Plan [Member] |  |  |  |
Net periodic cost |  |  |  |
Discount rate | 3.80% |  |  |
Return on assets | 6.25% |  |  |
Subsequent Event [Member] | United States Pension Plan of US Entity [Member] |  |  |  |
Net periodic cost |  |  |  |
Discount rate | 4.15% |  |  |

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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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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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