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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Benefit Plans [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Percentage of employer contribution to match participant contribution in defined contribution plan, net | 100.00% |  |
Cost of defined benefit plans | $ 532 | $ 499 | $ 471
Defined benefit plan cost | 11 | 9 | 14
Defined benefit plan obligation | $ 63 | 68 |
Defined Contribution Benefit Plans [Member] | Minimum [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Percentage of employer contribution to match participant contribution in defined contribution plan | 3.00% |  |
Defined Contribution Benefit Plans [Member] | Maximum [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Percentage of employer contribution to match participant contribution in defined contribution plan | 9.00% |  |
Restoration Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Number of hours of service required to qualify for the plan | 1,000 or more hours |  |
Noncontributory and nonqualified plan, benefit expense | $ 44 | 22 | 40
Noncontributory and nonqualified plan, accrued benefits liabilities | 227 | 205 |
Supplemental Executive Retirement Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined benefit plan cost | 19 | 26 | $ 28
Defined benefit plan obligation | $ 192 | $ 195 |

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- Definition No of hours of service required to qualify for the plan. + References No definition available. + Details
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- Definition Noncontributory, nonqualified plan, accumulated benefit obligation. + References No definition available. + Details
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- Definition Noncontributory, nonqualified plan, benefit cost. + References No definition available. + Details
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- Definition Pension Plans, Postretirement and Other Employee Benefits [Line Items] + 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://fasb.org/us-gaap/role/ref/legacyRef -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 net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 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 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) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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