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Employee Benefit Plans - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2016
Pension Benefits |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employer contribution to tax-qualified defined benefit pension plans | $ 80 | $ 160
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of pre-tax earnings paid for profit sharing plan |  | 5.00%
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of pre-tax earnings paid for profit sharing plan |  | 20.00%
RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of days used to compute performance period average closing price of restricted stock units |  | 20 days
Share-Based Compensation, award granted |  | 0.8
Share-Based Compensation, vesting period |  | 3 years
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-Based Compensation, award granted |  | 0.3
Share-Based Compensation, vesting period |  | 3 years
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of days used to compute performance period average closing price of restricted stock units |  | 20 days
Share-Based Compensation, award granted |  | 0.6
Share-Based Compensation, vesting period |  | 3 years
Share-Based Compensation, vesting date |  | Dec. 31, 2018

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- Definition Amount of contributions made by the employer to defined benefit plans. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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