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Retirement and Other Benefit Programs - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation of company's pension plans |  | $ 5,900,000,000 | $ 5,400,000,000 |
Expected return on plan assets assumption rate for 2018 |  | 6.25% |  |
General investment portfolio limits on holdings, description |  | 5.00% |  |
Defined benefit obligation in 2018 |  | $ 6,159,000,000 |  |
Defined contribution plan, contributions by employer |  | $ 45,000,000 | 50,000,000 | $ 46,000,000
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Allowed variance from target allocation of plan assets |  | 2.00% |  |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Allowed variance from target allocation of plan assets |  | 5.00% |  |
Return-Seeking Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation for plan assets |  | 53 percent |  |
Liability Hedging Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation for plan assets |  | 47 percent |  |
U.S. Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cash contributions by company to pension plan |  | $ 115,000,000 |  |
Contribution of the company in employee deferred contribution plan |  |  | $ 706,000,000 |
Defined benefit obligation in 2018 |  | 0 |  |
U.S. Pension Plan | Subsequent Event |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, decline in projected benefit obligation | $ (57,000,000) |  |  |
Pension And Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected cash outflow relating to OPEB in 2018 |  | 20,000,000 |  |
Puerto Rico Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Minimum expected equity contribution to pension plans in 2018 |  | 0 |  |
Foreign Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Minimum expected equity contribution to pension plans in 2018 |  | $ 26,000,000 |  |

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- Definition Defined benefit plan assumptions used calculating benefit obligation long term rate of return on plan assets. + References No definition available. + Details
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- Definition Percentage of investment in diversified portfolio. + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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