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Summary Of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 5 | $ 5 | $ 6
Interest cost | 17 | 21 | 19
Expected return on plan assets | (31) | (30) | (33)
Defined Benefit Plan Amortization Of Unrecognized Amounts | 9 | 7 | 7
Net periodic benefit cost | 0 | 3 | (1)
Employee Benefit Plans [Abstract] |  |  |
Defined Benefit Plan, Benefit Obligation | 926 | 821 | 722
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (84) | (87) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 26 | 13 |
Defined Benefit Plan, Plan Assets, Amount | 722 | 649 | $ 549
Actual return on plan assets | 71 | 91 |
Employer contributions | 14 | 21 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 14 | 14 |
Operating Expense [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 4 | 4 |
Selling, General and Administrative Expenses [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 1 | $ 1 |

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: 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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