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Summary of Funded Status of Pension Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Retirement Benefits [Abstract] |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 916 | $ 811 |
Assets for Plan Benefits, Defined Benefit Plan | (7) | (20) |
Liability, Defined Benefit Plan, Current | (4) | (4) |
Liability, Defined Benefit Plan, Noncurrent | (207) | (188) |
Employee Benefit Plans [Abstract] |  |  |
Benefit obligation at end of prior year | 821 | 722 |
Service cost | 5 | 5 | $ 6
Interest cost | 17 | 21 | 19
Actuarial loss | 84 | 87 |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 26 | 13 |
Benefit obligation at end of current year | 926 | 821 | 722
Fair value of assets at end of prior year | 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 |
Net benefits paid | (26) | (26) |
Fair value of assets at end of current year | 722 | 649 | 549
Total unfunded status at end of year (recognized in other non-current liabilities in the Consolidated Balance Sheets) | (204) | (172) |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 31 | 30 | 33
Defined Benefit Plan Amortization Of Unrecognized Amounts | 9 | 7 | 7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 0 | 3 | $ (1)
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 27 | 27 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 307 | 276 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | $ 518 | $ 466 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(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 + Details
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