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v3.20.4

Debt and Other Financing Arrangements - Schedule of Debt and Other Financing Arrangements (Parenthetical) (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Apr. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Due from 2022 to 2040 [Member] | Industrial Revenue Bonds [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument - maturity year - start |  |  | 2022 |
Debt instrument - maturity year - end |  |  | 2040 |
Due from 2022 to 2040 [Member] | Industrial Revenue Bonds [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 0.16% |  | 0.16% | 1.61%
Due from 2022 to 2040 [Member] | Industrial Revenue Bonds [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 0.19% |  | 0.19% | 1.82%
Notes, 4.125%, due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 4.125% |  | 4.125% |
Debt instrument - maturity year |  |  | 2022 |
Notes, 4.000%, due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 4.00% |  | 4.00% |
Debt instrument - maturity year |  |  | 2023 |
Notes, 2.000%, due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 2.00% |  | 2.00% |
Debt instrument - maturity year |  |  | 2025 |
Notes, 3.950%, due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 3.95% | 3.95% | 3.95% |
Debt instrument - maturity year |  | 2028 | 2028 |
Notes, 2.700%, due 2030 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 2.70% |  | 2.70% |
Debt instrument - maturity year |  |  | 2030 |
Notes, 6.400%, due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 6.40% |  | 6.40% |
Debt instrument - maturity year |  |  | 2037 |
Notes, 5.200%, due 2043 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 5.20% |  | 5.20% |
Debt instrument - maturity year |  |  | 2043 |
Notes, 4.400%, due 2048 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 4.40% | 4.40% | 4.40% |
Debt instrument - maturity year |  | 2048 | 2048 |
Notes, 2.979%, due 2055 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 2.979% |  | 2.979% |
Debt instrument - maturity year | 2055 |  | 2055 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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