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Employee Benefit Plans - Assumptions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | 197 |  |
Effect on postretirement benefit obligation, 1 Percent Decrease | $ (156) |  |
Other Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 4.40% | 3.80% | 4.30%
Assumptions used to determine net periodic benefit cost: |  |  |
Discount rate for service cost | 3.90% | 4.60% | 4.90%
Discount rate for interest cost | 3.50% | 3.80% | 4.00%
U.S. |  |  |
Assumptions used to determine benefit obligations: |  |  |
Rate of compensation increase | 4.50% | 4.50% | 4.50%
Assumptions used to determine net periodic benefit cost: |  |  |
Expected return on plan assets | 6.75% | 6.75% | 7.25%
Rate of compensation increase | 4.50% | 4.50% | 4.50%
U.S. | Pension Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 4.20% | 3.50% | 3.90%
Assumptions used to determine net periodic benefit cost: |  |  |
Discount rate for service cost | 3.70% | 4.20% | 4.40%
Discount rate for interest cost | 3.00% | 3.00% | 3.00%
Expected return on plan assets |  |  | 7.50%
U.S. | Other Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 4.30% | 3.60% | 4.10%
Int’l. |  |  |
Assumptions used to determine benefit obligations: |  |  |
Rate of compensation increase | 4.00% | 4.00% | 4.50%
Assumptions used to determine net periodic benefit cost: |  |  |
Expected return on plan assets | 5.50% | 5.50% | 6.30%
Rate of compensation increase | 4.00% | 4.50% | 4.80%
Int’l. | Pension Benefits |  |  |
Assumptions used to determine benefit obligations: |  |  |
Discount rate | 4.40% | 3.90% | 4.30%
Assumptions used to determine net periodic benefit cost: |  |  |
Discount rate for service cost | 3.90% | 4.30% | 5.30%
Discount rate for interest cost | 3.90% | 4.30% | 5.30%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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