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Pension and Other Postretirement Benefit Plans - Summary of Components of Net Periodic Pension Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 99 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | $ 1 | $ 1 | $ 3 | $ 3 |
Interest cost | 4 | 3 | 8 | 7 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization: |  |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0 |
Prior service credit | (3) | (2) | (5) | 1 |
Settlement and curtailment (gain) loss | 0 | 0 | (7) | 0 |
Net periodic benefit cost (credit) | 2 | 2 | (1) | 11 | $ (89)
United States Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 0 | 0 | 1 | 1 |
Interest cost | 31 | 29 | 62 | 59 |
Expected return on plan assets | (45) | (42) | (89) | (85) |
Amortization: |  |  |  |  |
Actuarial loss | 12 | 13 | 24 | 26 |
Prior service credit | 0 | 0 | (1) | (1) |
Settlement and curtailment (gain) loss | 0 | 0 | 0 | 0 |
Net periodic benefit cost (credit) | (2) | 0 | (3) | 0 |
Foreign Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 2 | 2 | 3 | 3 |
Interest cost | 6 | 6 | 12 | 12 |
Expected return on plan assets | (8) | (9) | (15) | (17) |
Amortization: |  |  |  |  |
Actuarial loss | 2 | 2 | 4 | 5 |
Prior service credit | 0 | 0 | 0 | 0 |
Settlement and curtailment (gain) loss | 0 | (3) | 1 | (3) |
Net periodic benefit cost (credit) | $ 2 | $ (2) | $ 5 | $ 0 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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