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Funded Status Percentage of Company's Pension Plans (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Funded status percentage of the company's pension plans |  |
Fair value of plan assets | $ 5,248,000,000 | $ 4,501,000,000
PBO | $ 6,159,000,000 |
Funded status percentage | 85.00% |
United States and Puerto Rico |  |
Funded status percentage of the company's pension plans |  |
PBO | $ 0 |
United States and Puerto Rico | Qualified Pension Plan |  |
Funded status percentage of the company's pension plans |  |
Fair value of plan assets | 4,426,000,000 |
PBO | $ 4,629,000,000 |
Funded status percentage | 96.00% |
United States and Puerto Rico | Non Qualified Pension Plan |  |
Funded status percentage of the company's pension plans |  |
PBO | $ 223,000,000 |
Foreign Pension Plans, Defined Benefit | Qualified Pension Plan |  |
Funded status percentage of the company's pension plans |  |
Fair value of plan assets | 822,000,000 |
PBO | $ 908,000,000 |
Funded status percentage | 91.00% |
Foreign Pension Plans, Defined Benefit | Non Qualified Pension Plan |  |
Funded status percentage of the company's pension plans |  |
PBO | $ 399,000,000 |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of plan assets to benefit obligation of defined benefit plan. + References No definition available. + Details
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