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Employee Benefit Plans (Principal Components of Employee Benefit Costs) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee Benefit Plan Disclosure [Line Items] |  |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $ 109 | $ 60 | $ 93
Savings Plan |  |  |
Employee Benefit Plan Disclosure [Line Items] |  |  |
Savings plan | 74 | 32 | 60
Unfunded Supplemental Benefit Plans |  |  |
Employee Benefit Plan Disclosure [Line Items] |  |  |
Employee benefit plan expenses | 11 | 9 | 9
Other Plans, Net |  |  |
Employee Benefit Plan Disclosure [Line Items] |  |  |
Other plans, net | $ 24 | $ 19 | $ 24

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- Definition Employee benefit plan disclosure line items. + References No definition available. + Details
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- Definition Savings and deferred compensation plans expense. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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- Definition Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. + References No definition available. + Details
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- Details
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- Details
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- Details
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