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Employee Stock-based Compensation Plans - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Stock options	$ 1	$ 3	$ 6
Restricted shares	98	77	56
Employee share repurchase program	2	3	3
Total stock-based compensation before income taxes	101	83	65
Tax benefit	(5)	(10)	(11)
Total stock-based compensation, net of tax	$ 96	$ 73	$ 54

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- Definition

Employee Stock Purchase Plan Expense

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Amount, after tax, of expense for award under share-based payment arrangement.

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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)
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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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