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Employee Stock-based Compensation Plans - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement [Abstract] |  |  |
Stock options | $ 3 | $ 6 | $ 9
Restricted shares | 77 | 56 | 56
Employee share repurchase program | 3 | 3 | 3
Total stock-based compensation before income taxes | 83 | 65 | 68
Tax benefit | (10) | (11) | (21)
Total stock-based compensation, net of tax | $ 73 | $ 54 | $ 47

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- Definition Employee Stock Purchase Plan Expense + References No definition available. + Details
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- Definition Amount, after tax, of expense for award under share-based payment arrangement. + References No definition available. + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of noncash expense for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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