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Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0 | $ 1 | $ 1
Interest cost | 35 | 49 | 46
Expected return on plan assets | (59) | (59) | (67)
Prior service cost | 0 | 0 | 0
Net actuarial loss | 23 | 15 | 21
Curtailment, settlement and termination costs | 52 | 0 | 0
Total expense | $ 51 | $ 6 | $ 1
Effective discount rate for benefit obligations | 3.06% | 4.12% | 3.48%
Effective rate for interest on benefit obligations | 2.65% | 3.79% | 3.09%
Effective rate for service cost | 3.43% | 3.93% | 3.32%
Effective rate for interest on service cost | 3.41% | 3.62% | 2.98%
Long-term rate of return on plan assets | 5.50% | 5.25% | 5.75%
Long-term rate of compensation increase | 3.00% | 3.00% | 2.54%
Pension Benefits | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 4 | $ 6 | $ 6
Interest cost | 9 | 13 | 13
Expected return on plan assets | (6) | (13) | (15)
Prior service cost | 1 | 0 | 1
Net actuarial loss | 3 | 2 | 2
Curtailment, settlement and termination costs | 1 | 1 | 1
Total expense | $ 12 | $ 9 | $ 8
Effective discount rate for benefit obligations | 1.79% | 2.52% | 2.24%
Effective rate for interest on benefit obligations | 1.55% | 2.20% | 1.94%
Effective rate for service cost | 0.92% | 1.89% | 2.33%
Effective rate for interest on service cost | 0.75% | 2.24% | 2.27%
Long-term rate of return on plan assets | 1.08% | 2.47% | 2.58%
Long-term rate of compensation increase | 2.32% | 2.32% | 3.47%
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0 | $ 0 |
Interest cost | 1 | 2 | $ 2
Prior service cost | (2) | (5) | (7)
Net actuarial loss | (4) | (4) | (3)
Total expense | $ (5) | $ (7) | $ (8)
Effective discount rate for benefit obligations | 2.80% | 3.90% | 3.09%
Effective rate for interest on benefit obligations | 2.41% | 2.71% | 2.71%
Effective rate for service cost | 2.52% | 2.97% | 2.98%
Effective rate for interest on service cost | 2.27% | 2.78% | 2.78%

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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 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 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)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: 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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