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Employee Benefit Plans (Details 5) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effects of change in the assumed health care cost-trend rates |  |  |
Effect on total service and interest cost components, 1 Percent Increase | $ 12 |  |
Effect on total service and interest cost components, 1 Percent Decrease | (10) |  |
Effect on postretirement benefit obligation, 1 Percent Increase | 188 |  |
Effect on postretirement benefit obligation, 1 Percent Decrease | $ (155) |  |
Other Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 3.80% | 4.30% | 4.60%
Assumptions used to determine net periodic benefit cost: |  |  |
Discount rate for service cost | 4.60% | 4.90% | 4.30%
Discount rate for interest cost | 3.80% | 4.00% | 4.30%
U.S. | Pension Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 3.50% | 3.90% | 4.00%
Rate of compensation increase | 4.50% | 4.50% | 4.50%
Assumptions used to determine net periodic benefit cost: |  |  |
Discount rate for service cost | 4.20% | 4.40% | 3.70%
Discount rate for interest cost | 3.00% | 3.00% | 3.70%
Expected return on plan assets | 6.75% | 7.25% | 7.50%
Rate of compensation increase | 4.50% | 4.50% | 4.50%
U.S. | Other Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 3.60% | 4.10% | 4.50%
Int’l. | Pension Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 3.90% | 4.30% | 5.30%
Rate of compensation increase | 4.00% | 4.50% | 4.80%
Assumptions used to determine net periodic benefit cost: |  |  |
Discount rate for service cost | 4.30% | 5.30% | 5.00%
Discount rate for interest cost | 4.30% | 5.30% | 5.00%
Expected return on plan assets | 5.50% | 6.30% | 6.30%
Rate of compensation increase | 4.50% | 4.80% | 5.10%

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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 increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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=82843861&loc=d3e1928-114920 + Details
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