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Employee Benefit and Retirement Plans - Composition of Domestic Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
United States |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | $ 1,161 | $ 1,228 |
United States | Equity securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 273 | 233 |
United States | Fixed income securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 760 | 730 |
United States | Alternative investments |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 104 | 239 |
United States | Cash and other |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 24 | 26 |
Level 1 | United States |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 449 | 457 |
Level 1 | United States | Equity securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 1 | United States | Fixed income securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 441 | 400 |
Level 1 | United States | Alternative investments |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 47 |
Level 1 | United States | Cash and other |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 8 | 10 |
Level 2 | United States |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 15 | 15 |
Level 2 | United States | Equity securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 2 | United States | Fixed income securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 2 | United States | Alternative investments |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 2 | United States | Cash and other |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 15 | 15 |
Level 3 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 10 | 9 | $ 10
Level 3 | United States |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 1 | 1 |
Level 3 | United States | Equity securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 3 | United States | Fixed income securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 3 | United States | Alternative investments |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Level 3 | United States | Cash and other |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 1 | 1 |
Subtotal | United States |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 465 | 473 |
Subtotal | United States | Equity securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 0 |
Subtotal | United States | Fixed income securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 441 | 400 |
Subtotal | United States | Alternative investments |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 0 | 47 |
Subtotal | United States | Cash and other |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 24 | 26 |
NAV-based assets | United States |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 696 | 755 |
NAV-based assets | United States | Equity securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 273 | 233 |
NAV-based assets | United States | Fixed income securities and funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 319 | 330 |
NAV-based assets | United States | Alternative investments |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | 104 | 192 |
NAV-based assets | United States | Cash and other |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan, fair value of plan assets | $ 0 | $ 0 |

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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=118255775&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=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 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&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=118257860&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=118255775&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=118255775&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=118255775&loc=d3e1928-114920 + Details
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