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v3.19.3.a.u2

Employee benefits - Additional information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Transfers in or out of Level 1 | $ 0 | $ 0 |
Transfers in or out of Level 2 | 0 | 0 |
Transfers in or out of Level 3 | 0 | 0 |
Pension Plans |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Service cost | 0 | 0 | $ 0
Termination benefit cost | 0 | 0 | 0
Pension Plans | ASU 2017-07 |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses |  |  | 5,000,000.0
OPEB Plan |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Service cost | 759,000 | 1,028,000 | 1,026,000
Termination benefit cost | 0 | 1,790,000 | 0
OPEB Plan | ASU 2017-07 |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Reclassification Other Components From Personnel To Other Operating Expenses |  |  | 2,500,000
Savings Plans |  |  |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |  |  |
Savings Plans | 81,000,000 | 70,400 |
Savings Plans Contributions | $ 15,100,000 | $ 12,700,000 | $ 10,000,000
Savings Plans Stocks Held | 1,378,048 | 1,490,253 |

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -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)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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