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Employee Benefits - Assumptions (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2024
Effects created by one percentage point change in assumed healthcare cost trend |  |  |  |  |  |
Effect of 1% point increase on postretirement obligation |  |  | $ 0 |  |  |
Effect of 1% point decrease on postretirement obligation |  |  | $ 0 |  |  |
United States Retirement Plans |  |  |  |  |  |
Net periodic cost |  |  |  |  |  |
Discount rate |  |  | 4.13% | 4.47% |  |
United Kingdom Retirement Plan |  |  |  |  |  |
Net periodic cost |  |  |  |  |  |
Discount rate |  |  | 2.58% | 3.84% |  |
Retirement Plans |  |  |  |  |  |
Benefit obligation |  |  |  |  |  |
Discount rate |  | 4.14% | 3.68% | 4.14% | 4.47% |
Net periodic cost |  |  |  |  |  |
Return on assets | 6.25% | 6.00% | 6.25% | 6.25% | 6.25% |
Retirement Plans | United States Retirement Plans |  |  |  |  |  |
Net periodic cost |  |  |  |  |  |
Discount rate |  |  | 4.13% | 4.47% | 4.15% |
Retirement Plans | United Kingdom Retirement Plan |  |  |  |  |  |
Net periodic cost |  |  |  |  |  |
Discount rate |  |  | 2.58% | 3.84% | 3.80% |
Postretirement Plans |  |  |  |  |  |
Benefit obligation |  |  |  |  |  |
Discount rate |  | 3.69% | 3.40% | 3.69% | 3.90% |
Net periodic cost |  |  |  |  |  |
Weighted-average healthcare cost rate |  | 7.00% | 7.00% | 7.00% | 7.00% |
Discount rate |  |  | 3.69% | 3.94% | 3.60% |
Forecast | Postretirement Plans |  |  |  |  |  |
Net periodic cost |  |  |  |  |  |
Weighted-average healthcare cost rate |  |  |  |  |  | 5.00%
Change in Accounting Method Accounted for as Change in Estimate |  |  |  |  |  |
Net periodic cost |  |  |  |  |  |
Decrease in pension and postretirement medical costs |  |  | $ 10 | $ 14 |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit 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=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit 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=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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