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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Defined Benefit Plan [Abstract] |
Periodic benefit cost (credit) related to our defined benefit plans, net | The components of net periodic benefit cost (credit) related to our defined benefit plans were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2018 |  | 2017 |  | 2018 |  | 2017
Three months ended September 30: |  |  |  |  |  |  |
Service cost | $ | 33 |  |  | $ | 31 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 22 |  |  | 21 |  |  | 2 |  |  | 3 |
Expected return on plan assets | (40 | ) |  | (37 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 16 |  |  | 13 |  |  | (1 | ) |  | — |
Prior service credit | (5 | ) |  | (5 | ) |  | (2 | ) |  | (4 | )
Special charges | 2 |  |  | 3 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 28 |  |  | $ | 26 |  |  | $ | 1 |  |  | $ | — |
Nine months ended September 30: |  |  |  |  |  |  |
Service cost | $ | 100 |  |  | $ | 92 |  |  | $ | 5 |  |  | $ | 4 |
Interest cost | 68 |  |  | 64 |  |  | 7 |  |  | 8 |
Expected return on plan assets | (122 | ) |  | (112 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 49 |  |  | 40 |  |  | (2 | ) |  | (2 | )
Prior service credit | (14 | ) |  | (15 | ) |  | (8 | ) |  | (12 | )
Special charges | 7 |  |  | 3 |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | 88 |  |  | $ | 72 |  |  | $ | 2 |  |  | $ | (2 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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