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Employee Retirement Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Qualified |  |  |  |
Net periodic pension cost for the company's defined-benefit pension plans |  |  |  |
Service cost | $ 1 | $ 1 | $ 2 | $ 2
Interest cost | 5 | 11 | 18 | 30
Expected return on plan assets | (6) | (12) | (17) | (34)
Amortization of net loss | 7 | 4 | 18 | 14
Net periodic pension cost | 7 | 4 | 21 | 12
Non-Qualified |  |  |  |
Net periodic pension cost for the company's defined-benefit pension plans |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 2 | 2 | 4 | 5
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net loss | 0 | 1 | 2 | 2
Net periodic pension cost | $ 2 | $ 3 | $ 6 | $ 7

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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