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Employee Benefit Plans - (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employee waiting period after hire to participate in the defined contribution plans | 90 days |  |
Employee maximum contribution towards defined contribution plans as percentage of annual compensation | 50.00% |  |
Employee maximum contribution towards defined contribution plans as percentage of annual incentive plan bonus | 80.00% |  |
Percentage of contribution upon eligibility for non union employees hired after threshold period | 3.00% |  |
Employer's match in cash of non-union employee contributions on first specified percentage of eligible compensation | 100.00% |  |
First percentage of eligible compensation on which specified percentage of non-union employee contribution is matched by the employer in cash | 3.00% |  |
Employer's match in cash of non-union employee contributions on next specified percentage of eligible compensation | 50.00% |  |
Next percentage of eligible compensation on which specified percentage of non-union employee contribution is matched by the employer in cash | 3.00% |  |
Employer maximum match of non-union employee contribution on eligible compensation | 4.50% |  |
Defined contribution plans expense | $ 104 | $ 92 | $ 88
Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Combined accumulated benefit obligation of pension plans | 150 | 154 |
Plan assets of pension plans | 150 | 150 |
Unfunded benefit obligation |  | 4 |
Other Postretirement Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded benefit obligation | $ 12 | $ 14 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&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 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: 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=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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